Filed Pursuant to Rule 424(b)(3)
                                                Registration Number 333-125051

                                   PROSPECTUS

                         CALYPTE BIOMEDICAL CORPORATION

               73,198,583 Shares of common stock, $0.03 Par Value


o     This  Prospectus  relates to the resale of our common stock by the selling
      security  holders,  all of whom were issued  securities in connection with
      our April  2005  private  placement  and our April  2005  credit  facility
      agreement, of up to 73,198,583 shares of our common stock, including:

      o     26,666,666  shares  of  common  stock  that may be  issued  upon the
            conversion  by the selling  security  holders of  $8,000,000  of our
            Secured 8%  Convertible  Promissory  Notes at a conversion  price of
            $0.30 per share; and

      o     26,666,666  shares of common stock underlying  Series A common stock
            purchase warrants exercisable beginning six months after issuance at
            an exercise price of $0.325 per share issued to the selling security
            holders concurrently with the 8% Notes; and

      o     12,000,000  shares of common stock underlying  Series B common stock
            purchase warrants exercisable beginning six months after issuance at
            an exercise price of $0.325 per share issued to the selling security
            holders concurrently with the 8% Notes; and

      o     2,662,916  shares  of  common  stock  issuable  as  compensation  to
            non-exclusive  placement agents who are selling security holders, of
            which

            o     325,000  shares  are  issuable  upon  conversion  of a $97,500
                  Secured 8%  Convertible  Promissory  Note  issued to a selling
                  security holder;

            o     325,000  shares are  issuable  upon the exercise of a Series A
                  common stock purchase warrant  exercisable at $0.325 per share
                  issued to a selling security holder;

            o     146,250  shares are  issuable  upon the exercise of a Series B
                  common stock purchase warrant  exercisable at $0.325 per share
                  issued to a selling security holder;

            o     533,333   shares  are  issuable   upon  exercise  of  warrants
                  exercisable  at $0.30 per share and having  substantially  the
                  same  terms,  but  excluding  the   anti-dilution   protection
                  provisions,  as the Series A common  stock  purchase  warrants
                  noted above issued to selling security holders; and

            o     1,333,333  shares  are  issuable  upon  exercise  of  warrants
                  exercisable  at $0.23 per share and having  substantially  the
                  same  terms,  but  excluding  the   anti-dilution   protection
                  provisions,  as the Series A common  stock  purchase  warrants
                  noted above issued to selling security holders;

      o     4,702,335  shares of common stock  underlying  Shares  issuable upon
            conversion  of the  Secured 8%  Convertible  Promissory  Notes which
            constitute   interest  accreted  to  principal  on  the  Secured  8%
            Convertible Promissory Notes; and

      o     500,000  shares of common stock  underlying a common stock  purchase
            warrant  exercisable  beginning  six  months  after  issuance  at an
            exercise  price of $0.40  per share  issued  to a  selling  security
            holder in connection with a $5,500,000 Credit Facility Agreement.

o     Except  for  proceeds  from the  exercise  of the  common  stock  purchase
      warrants,  the selling security  holders,  and not us, will receive all of
      the  proceeds  from any sales of the shares,  less any  brokerage or other
      expenses of the sale incurred by them.


o     Our common stock is traded on the American Stock Exchange under the symbol
      "HIV." The last reported sales price for our common stock on June 24, 2005
      was $0.192 per share.


o     Our principal  executive  offices are located at 5000 Hopyard Road,  Suite
      480,  Pleasanton,  California  94588,  and our  telephone  number is (925)
      730-7200.

                 THIS INVESTMENT INVOLVES A HIGH DEGREE OF RISK.
                     SEE "RISK FACTORS" BEGINNING ON PAGE 3.

We may  amend  or  supplement  this  Prospectus  from  time to  time  by  filing
amendments or supplements as required. You should read the entire Prospectus and
any  amendments  or  supplements  carefully  before  you  make  your  investment
decision.

Neither  the  Securities  and  Exchange  Commission  nor  any  state  securities
commission has approved or disapproved of these securities or determined if this
Prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.


                  The date of this Prospectus is July 6, 2005.





                                TABLE OF CONTENTS


                                                                            PAGE

Prospectus Summary                                                             1

Risk Factors                                                                   3

Forward-Looking Statements                                                    17

Use of Proceeds                                                               18

Selling Security Holders                                                      18

Plan of Distribution                                                          22

Legal Matters                                                                 24

Experts                                                                       24

Incorporation of Certain Documents by Reference                               24

Where You Can Find More Information                                           25

Disclosure of Commission Position on Indemnification for
   Securities Act Liabilities                                                 25


                              ABOUT THIS PROSPECTUS

      This  prospectus is part of a  registration  statement  that we have filed
with the Securities  and Exchange  Commission  utilizing a "shelf  registration"
process.  You should read this  prospectus  and any  supplement,  together  with
additional information described under "Where You Can Find More Information" and
the information we incorporate by reference in this  prospectus  described under
the heading "Incorporation of Certain Documents by Reference."




                               PROSPECTUS SUMMARY

      THE FOLLOWING SUMMARY HIGHLIGHTS SELECTED INFORMATION  CONTAINED ELSEWHERE
IN THIS PROSPECTUS OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS. THIS SUMMARY
DOES  NOT  CONTAIN  ALL OF THE  INFORMATION  THAT  YOU  SHOULD  CONSIDER  BEFORE
INVESTING IN OUR COMMON STOCK. YOU SHOULD READ THE ENTIRE PROSPECTUS  CAREFULLY,
ESPECIALLY THE  DISCUSSION  REGARDING THE RISKS OF INVESTING IN THE COMMON STOCK
OF CALYPTE  BIOMEDICAL  CORPORATION  UNDER THE SECTION  ENTITLED "RISK FACTORS,"
BEFORE INVESTING IN CALYPTE BIOMEDICAL CORPORATION'S COMMON STOCK. REFERENCES IN
THIS PROSPECTUS TO "WE," "US" AND "OUR" REFER TO CALYPTE BIOMEDICAL CORPORATION,
A DELAWARE CORPORATION.

                      ABOUT CALYPTE BIOMEDICAL CORPORATION

We develop, manufacture, and distribute in vitro diagnostic tests, primarily for
the diagnosis of Human Immunodeficiency  Virus ("HIV") infection.  Historically,
we have manufactured and marketed  urine-based HIV-1 diagnostic  screening tests
and  urine  and  serum-based   Western  Blot  supplemental   tests  for  use  in
laboratories,  which  we  refer  to as our  "Legacy  Business."  Since  we began
marketing our urine diagnostic  testing products following their approval by the
FDA and  through  the first  quarter  of 2005,  our  revenues  have been  almost
exclusively  generated from sales of these  products.  The Legacy Business tests
are  manufactured  in  formats  that  make them most  suitable  for  high-volume
laboratory settings.

Over the last two years,  however,  we have been broadening our historical focus
to include  other HIV tests,  such as a blood-based  incidence  test and various
rapid tests using other  specimens.  In the last quarter of 2004,  we introduced
our HIV-1 BED incidence EIA test (the "BED  Incidence  Test") that detects HIV-1
infections that have occurred within  approximately  the prior 6 months and that
can be  used by  public  health  agencies  to  identify  those  regions  and the
populations  within those  regions  where HIV  transmission  is  occurring  most
recently.  We are currently focusing on the development and commercialization of
our new test  products for the rapid  detection of  antibodies  to HIV-1 and HIV
Type 2, a second type of HIV ("HIV-2"),  in blood,  oral fluid and urine samples
using a lateral  flow  dipstick  design  (the  "HIV-1/2  Rapid  Tests")  and the
commercialization of the BED Incidence Test on a worldwide basis.

Rapid tests  provide test  results in less than 20 minutes and are  particularly
suitable for  point-of-care  testing,  especially in lesser developed  countries
which lack the medical  infrastructure to support  laboratory based testing.  We
have  completed  field trials of our HIV-1/2 Rapid Tests that have validated our
prototype  products.  We have recently  completed  clinical trials in Uganda and
China and are currently engaged in clinical trials in other countries in pursuit
of regulatory approvals for these tests.

In an effort to reduce our cash burn rate and  prolong our  resources,  in April
2005 we  announced  our  plans to  restructure  our  business  (the  "Plan")  to
consolidate  our  domestic  operations  and focus our capital  resources  on the
global  commercialization of the HIV-1/2 Rapid Tests and the BED Incidence Test.
As part of the Plan, we are  discontinuing the production of our Legacy Business
products currently manufactured at our facility in Rockville, Maryland. Pursuant
to the Plan,  we will pursue  various  options  ranging  from selling the Legacy
Business to  discontinuing  manufacturing  operations at the Rockville  facility
pending a final determination of its disposition.

In  furtherance  of the Plan,  on April 18, 2005,  we entered into a non-binding
letter  of  intent  to sell  the  Legacy  Business  to  Maxim  Biomedical,  Inc.
("Maxim").  Effective May 1, 2005, we entered into a manufacturing  services and
management  agreement (the  "Agreement") with Maxim pursuant to which Maxim will
manufacture,  ship and perform quality  control  procedures for us in connection
with the Legacy  Business.  Pursuant to the Agreement,  Maxim has the right, but
not the obligation, to purchase the assets of the Legacy Business on terms to be
negotiated between the parties. We will remain liable for our Rockville facility
and  equipment  lease  obligations,  however,  we expect to lower our  operating
expenses through this arrangement.


                                       1


Over the next  couple of months,  we expect to  complete  either the sale of the
Legacy  Business  to  Maxim  or  the  closure  of  the  Rockville  facility  and
termination  of Legacy  Business  operations  as well as the  transition  of our
corporate  headquarters  to the Portland,  Oregon area. We will incur  severance
costs for certain personnel  terminated at Rockville and certain  administrative
personnel not transitioning to Oregon. Our restructuring activities are expected
to result in severance-related charges of approximately $500,000. We also expect
to incur  approximately $1 million in expenses from the write-down of inventory.
We may also be liable for lease costs for the  California  offices  through July
2007 in the event we are unable to sublease that facility.

Upon successful  completion of a sale of the Legacy Business, we believe that we
will have significantly reduced our monthly operating burn rate as compared with
historical levels. If we are unable to complete such a transaction, we may incur
costs to decommission the Rockville  facilities;  on-going facility lease costs,
until and unless  sub-lease  opportunities  are available and on-going  lease or
lease termination  costs associated with leased  equipment.  We cannot currently
estimate  those costs,  but they will  increase our cash burn rate in comparison
with the sale  alternative.  Under either scenario,  the revenue stream from our
Legacy Business  products will have been eliminated and we will rely on revenues
from the sale of our BED Incidence  Test and,  following  regulatory  approvals,
from the sale of our HIV 1-2 Rapid Tests internationally.

We believe that the geographic  consolidation of our domestic operations and the
termination  of our  Legacy  Business  resulting  from this  restructuring  will
improve  our  operational  efficiency,  decrease  our cash burn and permit us to
concentrate on expediting the procedures  necessary to commercialize  the HIV1-2
Rapid  Tests and  thereby  begin the  process of  building  the  revenue  stream
necessary  to support our  operations  and achieve our  financial  objective  of
sustained profitable operations and increased stockholder value.


                                  THE OFFERING


TOTAL SHARES OF
  COMMON STOCK OUTSTANDING              171,908,903 as of June 24, 2005


COMMON STOCK BEING OFFERED FOR
  RESALE BY SELLING SECURITY
  HOLDERS                               Up to  73,198,583  shares  which  may be
                                        issued to the selling  security  holders
                                        upon their  conversion of our Secured 8%
                                        Convertible Promissory Notes or exercise
                                        of common stock purchase  warrants.  All
                                        of the shares offered by this Prospectus
                                        are being sold by the  selling  security
                                        holders.

RISK FACTORS                            The  shares  involve  a high  degree  of
                                        risk.    Investors    should   carefully
                                        consider the information set forth under
                                        "RISK FACTORS" beginning on page 3.

USE OF PROCEEDS                         We will not  receive any  proceeds  from
                                        the  sale of our  common  stock  offered
                                        through this  Prospectus  by the selling
                                        security holders.  All proceeds from the
                                        sale of our common stock sold under this
                                        Prospectus   will  go  to  the   selling
                                        security  holders.   We  will,  however,
                                        receive   an    aggregate   of   up   to
                                        approximately    $13.2   million   gross
                                        proceeds  if  the  selling  stockholders
                                        exercise   all  of  their   warrants  to
                                        purchase  common stock.  We would expect
                                        to  use  these   proceeds   for  general
                                        corporate purposes.

DETERMINATION OF OFFERING PRICE         This Prospectus may be used from time to
                                        time by the selling security holders who
                                        offer our common  stock in  transactions
                                        (which may include  block  transactions)
                                        at prevailing  market prices at the time
                                        of  sale,  at  prices   related  to  the
                                        prevailing  market  prices,  or at other
                                        negotiated  prices. The selling security
                                        holders   will  act   independently   in
                                        determining  the offering  price of each
                                        sale.

TRADING SYMBOL FOR OUR COMMON STOCK     HIV


                                       2


                                  RISK FACTORS

YOU SHOULD  CAREFULLY  CONSIDER THE RISKS  DESCRIBED  BELOW  BEFORE  DECIDING TO
INVEST IN OUR COMMON STOCK.  AN  INVESTMENT IN OUR COMMON STOCK  INVOLVES A HIGH
DEGREE OF RISK.  THE RISKS AND  UNCERTAINTIES  DESCRIBED  BELOW ARE NOT THE ONLY
ONES WE FACE.  ADDITIONAL RISKS AND  UNCERTAINTIES  NOT PRESENTLY KNOWN TO US OR
THAT WE  CURRENTLY  DEEM  IMMATERIAL  MAY ALSO  IMPAIR OUR  BUSINESS,  FINANCIAL
CONDITION  AND RESULTS OF  OPERATIONS.  IF ANY OF THE FOLLOWING  RISKS  ACTUALLY
OCCUR,  OUR BUSINESS,  FINANCIAL  CONDITION  AND RESULTS OF OPERATIONS  COULD BE
HARMED.  IN THAT CASE, THE TRADING PRICE OF OUR COMMON STOCK COULD DECLINE,  AND
YOU COULD LOSE ALL OR PART OF YOUR  INVESTMENT.  IN ASSESSING  THESE RISKS,  YOU
SHOULD ALSO REFER TO THE OTHER INFORMATION INCLUDED OR INCORPORATED BY REFERENCE
IN THIS PROSPECTUS, INCLUDING OUR FINANCIAL STATEMENTS AND THE NOTES THERETO.


                    RISKS RELATED TO OUR FINANCIAL CONDITION

If We are Unable to Obtain Additional Financing If and When Required We May Have
to  Significantly  Curtail the Scope of Our  Operations  and Alter Our  Business
Model.

There can be no assurance that the proceeds from our issuance of $8.0 million of
Secured 8% Convertible  Notes in April 2005 and the  availability  of $5,500,000
under the terms of a Credit Facility  Agreement  entered into in April 2005 will
be adequate to sustain  our  operations  at expected  levels  through  2005.  We
believe we will need to arrange additional  financing to fund our operations and
make the investments necessary to continue to execute our business plan early in
2006 or thereafter.  In addition,  there is no assurance that we will achieve or
sustain profitability or positive cash flows in the future.

In the absence of adequate  resources from current  working capital and existing
financing  arrangements,  we may be  required  to raise  additional  capital  to
sustain our  operations.  There can be no assurance  that  additional  financing
would be available,  or if it is available,  be on acceptable terms. We would or
might  be  required  to  consider  strategic  opportunities,  including  merger,
consolidation,  sale or other comparable transaction, to sustain our operations.
We do not  currently  have any  agreements  in place  with  respect  to any such
additional  financing  or strategic  opportunity,  and there can be no assurance
that any such  opportunity  will be available to us on acceptable  terms,  or at
all. If  additional  financing is not available to us if and when required or is
not available to us on acceptable  terms, or we are unable to arrange a suitable
strategic  opportunity,  we will be in significant financial jeopardy and we may
be unable to continue our operations at current levels,  or at all. The terms of
a  subsequent  financing  may involve a change of control,  require  stockholder
approval,  and/or  trigger  anti-dilution  protection  clauses  contained in the
Secured  8%  Convertible  Notes and  Series A and  Series B  warrants  issued in
connection  therewith that would result in substantial  dilution to our existing
stockholders.  Further,  our pledge of the  rights to our  assets as  collateral
security  for the issuance of the Secured 8%  Convertible  Notes may inhibit our
ability to secure  financing in the future.  There can be no  assurance  that we
will  enter  into  such  agreements  or  secure  such  financing,  or  that  our
stockholders will approve the terms of such financing,  if so required.  If such
additional financing is not available to us when required or is not available to
us on  acceptable  terms,  or we are  unable  to  arrange a  suitable  strategic
opportunity,  we will be in significant  financial jeopardy and we may be unable
to continue our operations at current levels, or at all.

Our 2004 PIPEs Contain Anti-Dilution Protection Provisions Which, If Approved By
Our  Stockholders,  Will Result in Dilution to Stockholders Not Entitled To Such
Protection.

Subject to approval by our stockholders, the terms of the Secured 8% Convertible
Notes trigger the anti-dilution  protection  provisions  granted to investors in
our 2004 PIPEs, as amended,  and require that we issue approximately 7.1 million
additional shares of our common stock,  reprice the 10.7 million warrants issued
in the 2004 PIPEs from an  exercise  price of $0.50 per share to $0.45 per share
and grant additional  warrants to purchase  approximately  1.3 million shares of
our Common  Stock at an exercise  price of $0.325 per share to those  investors.
Certain investors in the 2004 PIPEs who held shares of our common stock prior to
their  investment  in  those  transactions  and  who  also  continue  to be  our
stockholders  have entered into a voting agreement to vote their eligible shares
in favor of  approval  of such  anti-dilution  entitlements.  If approved by our
stockholders,  the issuance of such  additional  shares and warrants will dilute
the  interest  of  stockholders  not  subject to such  anti-dilution  protection
rights.


                                       3


Our Financial  Condition has  Adversely  Affected Our Ability to Pay  Suppliers,
Service  Providers  and  Licensors  on a Timely Basis Which May  Jeopardize  Our
Ability to Continue Our Operations and to Maintain  License Rights  Necessary to
Continue Shipments and Sales of Our Products.

As of March 31, 2005 our accounts  payable  totaled $2.0 million,  of which $1.1
million was over sixty days past due.  Additionally,  at March 31, 2005, we were
delinquent  on an  aggregate  of $0.8  million  in  payments  under the terms of
intellectual property license agreements necessary in the production and sale of
our rapid tests.  Further,  we currently have many cash-only  arrangements  with
suppliers.  Certain  vendors  and  service  providers  may choose to bring legal
action  against us to  recover  amounts  they deem due and  owing.  While we may
dispute certain of these claims,  should a creditor prevail,  we may be required
to pay all amounts due to the creditor.  If the working capital that will enable
us to make the required  payments is not  available  when  required,  we will be
placed in  significant  financial  jeopardy and we may be unable to continue our
operations at current levels, or at all.


We Have Incurred Losses in the Past and We Expect to Incur Losses in the Future.

We have incurred  losses in each year since our inception.  Our net loss for the
three months ended March 31, 2005 and the year ended  December 31, 2004 was $3.3
million and $17.3 million;  respectively,  and our accumulated  deficit at March
31, 2005 was $148.4 million. We expect operating losses to continue during 2005,
as we complete the  commercialization of our rapid tests,  complete our domestic
restructuring and international  technology  transfers,  and conduct  additional
research and development and clinical trials for potential new products.


We May be Faced with A Legal Claim for Damages  with  Respect to the Issuance of
Shares  of  Common  Stock  on  a  Claimed  Conversion  of  Our  12%  Convertible
Debentures.

A claim has been made by Logisticorp,  Inc. (Logisticorp) and Southwest Resource
Preservation,  Inc.  (Southwest)  with respect to an aggregate of $60,000 of 12%
Convertible  Debentures  assigned to  Logisticorp  and  Southwest by a debenture
holder.  Logisticorp's  and  Southwest's  claim  is  that  each  tendered  their
respective  conversion  notice requests in August,  2003 and that as a result of
their separate notices of election to convert their  debentures,  that Southwest
is  entitled  to  receive  427,807   registered  shares  of  common  stock,  and
Logisticorp  213,903  registered  shares of common  stock  for an  aggregate  of
641,710 shares of common stock. Additionally,  Logisticorp claims damages in the
sum of at least  $235,000,  and Southwest  claims damages in the sum of at least
$471,000,  or an aggregate of at least $706,000. We have advised Logisticorp and
Southwest  that we dispute  their claims with respect to the  conversion  notice
date,  the  conversion  price and the number of shares based upon the formula in
the debenture and the  registration  rights for the underlying  shares.  We have
been unable to contact Logisticorp and Southwest for the past several months and
have not yet achieved a resolution of the claims. There can be no assurance that
we will not be responsible for damages  including legal fees and expenses in the
event that the claim is pursued.


                RISKS RELATED TO THE MARKET FOR OUR COMMON STOCK

Our  Registration of a Significant  Amount of Our Stock Issuable upon Conversion
of Notes or  Exercise  of  Warrants  and  Eligible  for  Future  Sale May Have a
Negative Effect on the Trading Price of Our Stock.

Under the terms of the April 2005 Secured 8% Convertible Notes and warrants (the
"April 2005 Private Placement") and in connection with the 2005 Credit Facility,
we are  required  to  file a  registration  statement  to  register  for  resale
approximately  73.2 million shares of our common stock,  of which  approximately
66.1  million  shares  may be  issued  upon the  conversion  of our  Secured  8%
Convertible  Notes  or the  exercise  of our  Series  A  Warrants  and  Series B
Warrants,  and  the  remaining  7.1  million  shares  may be  issued  under  fee
agreements or, subject to stockholder  approval,  as interest on the Notes. Upon
the effectiveness of the registration  statement and the conversion of the notes


                                       4


or exercise of the warrants, the investors will hold freely tradable shares. The
issuance of such shares would increase by approximately 42% the number of shares
currently  outstanding,  essentially  all which are also  registered  and freely
tradable.  If investors in the April 2005 Private  Placement or other  investors
holding a significant number of freely tradable shares decided to sell them in a
short period of time, such sales could contribute  significant downward pressure
on the trading price of our stock.  Such sales might also inhibit our ability to
obtain future equity or  equity-related  financing on acceptable  terms,  if and
when that becomes necessary.

From  inception  through  March 31,  2005,  we have issued  approximately  171.2
million shares of our common stock and raised  approximately $143 million.  At a
Special Meeting of Stockholders on February 14, 2003, our stockholders  approved
an  increase  in the number of  authorized  shares of our common  stock from 200
million to 800 million.  After  considering the share reserves  required for the
April  2005  Private  Placement,  we have the  ability to issue in excess of 400
million  shares of our common  stock for  financing or for other  purposes.  The
perceived risk of dilution from this amount of authorized but unissued stock may
cause our existing stockholders and other holders to sell their shares of stock,
which  would  contribute  to a  decrease  in our stock  price.  In this  regard,
significant  downward  pressure on the trading price of our stock may also cause
investors  to  engage  in  short  sales,   which  would  further  contribute  to
significant downward pressure on the trading price of our stock.


Our  Stockholders  May  Experience  Substantial  Dilution  as a Result of the 8%
Convertible   Notes  Issued  in  the  April  2005  Private   Placement  and  the
Anti-Dilution Provisions Contained Therein.

Subject to stockholder  approval,  the terms of the April 2005 Private Placement
include  anti-dilution  protection  provisions  that  would  require us to issue
additional  shares upon  conversion  of the Notes and to re-price  downward  the
Sereis A Warrants if we issue additional  shares of common stock or common stock
equivalents at less than the note conversion or warrant  exercise price pursuant
to  financing(s)  completed  within  one  year of that  transaction.  Should  we
complete a transaction triggering these anti-dilution provisions,  the interests
of our existing stockholders not subject to such anti-dilution protection rights
could be even further diluted.


Our Issuance of Warrants,  Options and Stock Grants to Consultants  for Services
and the  Granting of  Registration  Rights for the  Underlying  Shares of Common
Stock May Have a Negative Effect on the Trading Price of Our Common Stock.

As we  continue  to look for ways to  minimize  our use of cash while  obtaining
required  services,  we expect to continue to issue  warrants  and options at or
below the current  market price or make  additional  stock bonus grants.  During
2004,  we issued  approximately  2.1 million  shares in payment  for  consulting
services and for the acquisition of intellectual property and equipment.  During
the first  quarter  of 2005,  we issued  approximately  0.1  million  shares and
approximately  1.2 million options at market in payment of consulting  services.
In addition to the potential dilutive effect of issuing a large number of shares
or options, there is the potential that a large number of the shares may be sold
on the open market at any given time,  which  could  place  additional  downward
pressure on the trading price of our common stock.


The Price of Our Common Stock Has Been Highly  Volatile  Due to Several  Factors
Which Will Continue to Affect the Price of Our Stock.

Our common  stock has traded as low as $0.18 per share and as high as $0.745 per
share in the twelve  months  ended March 31,  2005.  We believe that some of the
factors leading to the volatility include:

o     price and volume  fluctuations  in the stock  market at large which do not
      relate to our operating performance;

o     fluctuations in our operating results;

o     concerns about our ability to finance our continuing operations;

o     financing  arrangements  which may require the  issuance of a  significant
      number  of  shares  in  relation   to  the  number  of  shares   currently
      outstanding, including anti-dilution provisions;


                                       5


o     announcements of technological innovations or new products which we or our
      competitors make;

o     FDA, SEC and international regulatory actions;

o     availability of reimbursement  for use of our products from private health
      insurers,   governmental  health  administration   authorities  and  other
      third-party payors;

o     developments with respect to patents or proprietary rights;

o     public concern as to the safety of products that we or others develop;

o     changes in health care policy in the United States or abroad;

o     changes in stock market analysts' recommendations regarding Calypte, other
      medical products companies or the medical product industry generally;

o     fluctuations in market demand for and supply of our products;

o     certain world conditions,  such as an economic downturn, natural disasters
      or terrorist attacks; and

o     anti-American  sentiment in certain  international markets where we market
      or anticipate marketing our products.


We Are  Subject to  Governmental  and Stock  Exchange  Regulations  That  Impose
Operational and Reporting Requirements.

The  Sarbanes-Oxley  Act of 2002 and our listing on the American  Stock Exchange
(Amex) in August 2004 required us to modify or supplement  some of our corporate
governance and securities  disclosure and compliance  practices.  The Securities
and Exchange Commission and the Amex have revised, and continue to revise, their
regulations and policies. These developments have increased, and are expected to
increase, our legal, compliance and financial reporting costs. Failure to comply
with present or future laws,  rules and  regulations of any kind that govern our
business  could  result in  suspension  or  cessation of all or a portion of our
operations, or the imposition of significant  administrative,  civil or criminal
penalties, any of which could harm our business.


Failure to Achieve and Maintain Internal Controls in Accordance With Section 404
of the  Sarbanes-Oxley  Act of 2002 Could Have A Material  Adverse Effect on Our
Business and Stock Price.

We  are in  the  process  of  examining  and  evaluating  our  internal  control
procedures to satisfy the requirements of Section 404 of the Sarbanes-Oxley Act,
which will require our management to annually  assess the  effectiveness  of our
internal controls over financial reporting and our independent registered public
accounting firm to report on our assessment  beginning with our Annual Report on
Form 10-KSB for the year ending  December 31, 2006.  While we expect to complete
our  documentation,  testing and  remediation of any identified  deficiencies in
time to meet the deadline for compliance  with the  requirements of Section 404,
there  can be no  assurance  that  we  will do so.  In  addition,  if we fail to
maintain the adequacy of our internal controls or fail to implement required new
or improved  controls,  as such control standards are modified,  supplemented or
amended from time to time,  we may not be able to ensure that we can conclude on
an  ongoing  basis  that we have  effective  internal  controls  over  financial
reporting  in  accordance  with  Section 404.  Effective  internal  controls are
necessary for us to produce reliable  financial reports and are important in the
prevention of financial fraud. If we cannot produce reliable  financial  reports
or prevent fraud, our business and operating results could be harmed,  investors
could lose confidence in our reported financial information,  and there could be
a material adverse effect on our stock price.


Our Charter Documents May Inhibit a Takeover.

Certain provisions of our Certificate of Incorporation and Bylaws could:

o     discourage potential acquisition  proposals (i.e.  stockholder rights plan
      also known as a "poison pill");

o     delay or prevent a change in control;


                                       6


o     diminish  stockholders'  opportunities to participate in tender offers for
      our common stock, including tender offers at prices above the then-current
      market price;

o     inhibit  increases  in the  market  price of our  common  stock that could
      result from takeover attempts; or

o     grant to the  Board of  Directors  the  discretionary  right to  designate
      specific  rights and  preferences of preferred stock greater than those of
      our common stock.

Furthermore,  we are  subject to the  provisions  of Section  203 of the General
Corporation Law of the State of Delaware (DGCL). In general,  the DGCL prohibits
a publicly-held  Delaware corporation from engaging in a "business  combination"
with an "interested  stockholder"  for a period of three years after the date of
the  transaction in which the person becomes an interested  stockholder,  unless
the business  combination  is approved in a prescribed  manner.  An  "interested
stockholder" is a person who, together with affiliates and associates,  owns, or
within the prior three years did own,  15% or more of the  corporation's  voting
stock.   This  provision  could  make  it  more  difficult  for  an  "interested
stockholder"  to obtain  control  of us  without  the  approval  of the Board of
Directors.


We Have  Adopted  a  Stockholder  Rights  Plan  That Has  Certain  Anti-takeover
Effects.

On December  15, 1998,  the Board of  Directors  of Calypte  declared a dividend
distribution of one preferred share purchase right (Right) for each  outstanding
share of our common  stock.  The  dividend  was payable to the  stockholders  of
record on January 5, 1999,  with  respect to each share of common  stock  issued
thereafter until a subsequent  "distribution date" defined in a Rights Agreement
and, in certain  circumstances,  with  respect to shares of common  stock issued
after the Distribution Date.

The Rights have certain anti-takeover effects. The Rights will cause substantial
dilution to a person or group that  attempts to acquire us without  conditioning
the offer on the Rights being  redeemed or a substantial  number of Rights being
acquired.  However,  the Rights should not interfere  with any tender offer,  or
merger,  which we approve  because the Rights do not become  exercisable  in the
event of an offer or other acquisition exempted by our Board of Directors.


Our Board of  Directors  has Certain  Discretionary  Rights With  Respect to Our
Preferred   Shares  That  May   Adversely   Affect  the  Rights  of  our  Common
Stockholders.

Our Board may, without stockholder  approval,  designate and issue our preferred
stock in one or more series.  Additionally,  our Board may  designate the rights
and  preferences  of each series of preferred  stock it designates  which may be
greater  than the rights of our common  stock.  Potential  effects on our common
stock may include among other things:

o     restricting dividends;

o     dilution of voting power;

o     impairment of liquidation rights; and

o     delaying or preventing a change in control of the Company.

Additionally,  as a result of the 1:30  reverse  split of our common  stock that
became  effective  in May 2003,  we  currently  have over 400 million  shares of
common  stock that could be issued for  financing  or other  purposes.  Dilution
resulting  from such  issuance  could  also  adversely  affect the rights of our
current common stockholders.


Our  Common  Stock is  Subject  to the  "Penny  Stock"  Rules of the SEC and the
Trading Market In Our  Securities is Limited,  Which Makes  Transactions  in Our
Stock Cumbersome and May Reduce the Value of an Investment in Our Stock.


                                       7


Shares of our common stock are "penny  stocks" as defined in the  Exchange  Act.
The "penny stock" rules adopted by the Commission under the Exchange Act subject
the sale of the shares of our common stock to certain  regulations  which impose
sales practice  requirements  on  broker/dealers.  For example,  brokers/dealers
selling such securities must, prior to effecting the transaction,  provide their
customers  with a  document  that  discloses  the  risks  of  investing  in such
securities. Included in this documents are the following:

o     thebid and offer price quotes in and for the "penny stock", and the number
      of shares to which the quoted prices apply.

o     the brokerage firm's compensation for the trade.

o     the  compensation  received by the  brokerage  firm's sales person for the
      trade.

In addition, the brokerage firm must send the investor:

o     a monthly  account  statement  that gives an estimate of the value of each
      "penny stock" in the investor's account.

o     a written statement of the investor's  financial  situation and investment
      goals.

Legal remedies,  which may be available to you as an investor in "penny stocks",
are as follows:

o     if "penny  stock" is sold to you in violation of your rights listed above,
      or other federal or states securities laws, you may be able to cancel your
      purchase and get your money back.

o     if the stocks are sold in a fraudulent  manner, you may be able to sue the
      persons and firms that caused the fraud for damages.

o     if you have  signed an  arbitration  agreement,  however,  you may have to
      pursue your claim through arbitration.

If the person  purchasing  the  securities  is someone  other than an accredited
investor or an established customer of the broker/dealer, the broker/dealer must
also  approve  the  potential   customer's  account  by  obtaining   information
concerning  the  customer's  financial  situation,   investment  experience  and
investment objectives.  The broker/dealer must also make a determination whether
the  transaction  is suitable  for the  customer  and whether the  customer  has
sufficient  knowledge  and  experience  in  financial  matters to be  reasonably
expected  to  be  capable  of  evaluating  the  risk  of  transactions  in  such
securities.  Accordingly,  the  Commission's  rules  may  limit  the  number  of
potential purchasers of the shares of our common stock.

Resale restrictions on transferring "penny stocks" are sometimes imposed by some
states,  which may make  transaction  in our stock more difficult and may reduce
the value of the investment.  Various state securities laws impose  restrictions
on  transferring  "penny stocks" and as a result,  investors in our common stock
may have the ability to sell their shares of our common stock impaired.


                          RISKS RELATED TO OUR BUSINESS

We May Be Unsuccessful in Implementing Our Restructuring Plans as Anticipated.

In April  2005,  we  commenced  a  restructuring  plan under  which we expect to
consolidate our domestic  operations and discontinue the production of our HIV-1
Urine EIA and  supplemental  HIV-1 Western Blot serum and urine diagnostic tests
at our  Rockville,  Maryland  plant and focus our efforts and  resources  on our
rapid HIV diagnostic and HIV-1 BED Incidence tests. During 2004, we consolidated
our U.S.  manufacturing  operations into a single facility at Rockville and have
recently  completed  the  internal  validation  and  comparability  studies  and
submitted our  application  to the FDA for approval of our facility  changes and
urine EIA manufacturing  operations in Rockville.  The restructuring  plan calls
for management to pursue options  ranging from selling our urine EIA and Western
Blot business,  in which case the acquirer would likely  continue to operate the
Rockville facility, to terminating the employees and discontinuing manufacturing
operations  at the  Rockville  facility  pending  a final  determination  of its
disposition. We terminated a significant number of our manufacturing and quality
systems  personnel  at  Rockville  in April  2005 and  expect to  terminate  the
remainder during May 2005.


                                       8


In the course of implementing the  restructuring  plan, in April 2004 we entered
into a  non-binding  letter of intent to sell our urine EIA,  serum Western Blot
and urine Western blot diagnostic test business.  In May 2005, we entered into a
manufacturing  services  agreement  with the potential  acquirer under which the
potential acquirer has hired certain of our former employees and contractors and
is acting as a contract manufacturer of our EIA and Western Blot products at the
Rockville  facility.  The terms of the proposed  transaction are currently being
negotiated  and we expect to execute a definitive  agreement for the sale of the
EIA and Western Blot business during the second quarter of 2005.

There can be no assurance that we will  consummate a transaction for the sale of
our EIA and  Western  Blot  business.  In  addition  to  reaching  a  definitive
agreement with the potential  acquirer,  there are other  requirements not under
our control necessary to concluding the proposed transaction, including, but not
limited to,  obtaining FDA approval for the manufacture of the urine EIA product
at Rockville  and the transfer of licenses and  certifications  to the potential
acquirer,  landlords'  approval  for  the  execution  of  subleases  for the two
Rockville  facilities,  equipment  lessor's  approval  for  a  sublease  of  the
equipment,  intellectual  property  licensors'  approval  for  the  transfer  or
sublicense of technology or proprietary  knowledge  rights,  and approval of the
Noteholders  in the April 2005 Private  Placement with respect to their security
interest in our assets.  If we are able to successfully  complete a transaction,
we believe that we will significantly  reduce our monthly operating burn rate as
compared  with  historical   levels.  If  we  are  unable  to  complete  such  a
transaction,  we may  incur  costs to  decommission  the  Rockville  facilities;
on-going  facility  lease  costs,  until  and  if  sub-lease  opportunities  are
available and on-going lease or lease  termination  costs associated with leased
equipment.  We  cannot  currently  estimate  those  costs.  Whether  or  not  we
consummate a transaction for the sale of our urine EIA and Western Blot products
business,  we  expect  to incur  approximately  $1  million  in  one-time  costs
associated with the transfer or disposition of inventories and supplies.

Additionally,  the  restructuring  plan  calls  for us to  close  our  corporate
headquarters  in  Pleasanton,  California  and  re-staff  those  functions  at a
facility we plan to lease in the vicinity of Portland, Oregon, where most of our
research & development  staff is presently  based.  We expect to retain  current
headquarters staff for the period required to provide an orderly transition.  We
expect to incur approximately $0.5 million as the cost of terminating  employees
at our  Rockville  and  Pleasanton  locations,  including the payment of accrued
vacation expense,  essentially all of which will be paid in 2005. In the absence
of sublease opportunities, we will be liable for approximately $190,000 in lease
costs from the expected July 2005 closure of our  Pleasanton  office through the
June 2007 expiration of the lease.


We May Not Be Able to Retain Our Key Executives and Other Personnel.

As a result of the restructuring  plan we are implementing,  a number of our key
executives  and  senior   administrative,   quality  systems  and  research  and
development  personel  and  staff  have  left  the  company  or do not  plan  to
transition  to the new  operation  in  Oregon  when we close the  Rockville  and
Pleasanton  facilities.  As a small company, our success depends on the services
of key employees in these  positions.  Our inability to replace key employees in
certain  positions as a result of our  financial  condition or for other reasons
could have a material adverse effect on our operations.


We Have  Historically  Depended for Our Revenues Upon the Viability of Our ELISA
Products -- Our HIV-1  Urine-Based  Screening Test and Our Urine and Blood Based
Supplemental Tests - Which We Are Discontinuing.

We are discontinuing the production of our HIV-1 urine-based  screening test and
urine and blood-based supplemental tests as a part of our restructuring plan and
will not derive any  revenue  from the sale of these  products  when the plan is
fully  implemented.  We have  completed  the  technology  transfer for our HIV-1
incidence  test and have that  product  available  for sale,  but we have little
experience  marketing that test and no experience marketing our rapid tests that
are  currently  being   commercialized.   If  we  cannot  profitably   introduce
significant new products on a timely basis and if these products fail to achieve
market  acceptance  or  generate  significant  revenues,  we may  have  to  seek
additional financing, which may not be available on the timetable required or on
acceptable terms, or we may have to curtail our operations, or both.


                                       9


We are Dependent Upon Patents,  Licenses and Other Proprietary Rights From Third
Parties.

To facilitate the development and commercialization of a proprietary  technology
base for our rapid test products,  we have obtained licenses to patents or other
proprietary rights from other parties.  Obtaining such licenses has required the
payment of  substantial  amounts and will  require the payment of  royalties  to
maintain them in the future.

We have recently  acquired licenses to technologies that we believe are critical
to our ability to sell our rapid tests currently being  commercialized and other
rapid  tests that we may plan to develop  and/or  commercialize  in the  future.
There are numerous  patents in the United States and other countries which claim
lateral  flow  assay  methods  and  related  devices,  some of which  cover  the
technology used in our rapid test products and are in force in the United States
and  other  countries.  In  the  second  quarter  of  2004,  we  entered  into a
non-exclusive  sublicense  agreement  with  Abbott  Laboratories  that grants us
worldwide  rights  related to patents for lateral flow assay methods and related
devices.  We believe that the acquisition of these rights will enable us to make
or sell our rapid test  products in countries  where these patents are in force.
In the third quarter of 2004, we acquired a sublicense from Bio-Rad Laboratories
and Bio-Rad  Pasteur for patents  related to the  detection  of the HIV-2 virus.
HIV-2 is a type of the HIV virus  estimated to represent a small fraction of the
known HIV cases worldwide.  Nevertheless, HIV-2 is considered to be an important
component in the testing  regimen for HIV in many markets.  We believe that this
sub-license  agreement makes it possible for us to sell HIV-2 tests in countries
where such  patents are in force,  or to  manufacture  in  countries  where such
patents are in force and then sell into non-patent markets.  Additionally,  late
in 2003 we  licensed  an antigen  necessary  for  certain  of our rapid  HIV-1/2
products  from  Adaltis,  Inc.,  and in the third  quarter of 2004,  we acquired
rights  from Ani  Biotech  for its rapid  test  diagnostic  platform  and sample
applicator,  which we believe is a viable  alternative  to current  lateral flow
technologies and with potentially worldwide  applicability.  The loss of any one
of these  licenses or  challenges  to the patents  would be  detrimental  to the
commercialization of our rapid tests by delaying or limiting our ability to sell
our rapid test products, which would adversely affect our results of operations,
cash flows and business.

We  currently  have the right to use patent  and  proprietary  rights  which are
material to the  manufacture  and sale of the HIV-1  urine-based  screening test
under  licensing   agreements  with  New  York  University,   Cambridge  Biotech
Corporation and the Texas A&M University  System.  We also have the right to use
patent and proprietary  rights material in the manufacture and sale of the HIV-1
serum- and  urine-based  supplemental  tests  under a licensing  agreement  with
National Institutes of Health. Subject to the agreement of our licensors,  where
required,  we plan to  assign  the  patent  rights  attributable  to our  legacy
products to the party that acquires our EIA and Western Blot business,  although
we  will  require   license   agreements  from  certain  of  these  parties  for
technologies used in our rapid tests and other potential new products.

As of March 31, 2005 we had accrued an aggregate of approximately  $1,035,000 in
past due royalty and upfront  intellectual  property  rights  obligations to our
patent licensors.  Much of these past due amounts have been repaid subsequent to
quarter-end, including what we believe are the essential licenses for our Legacy
Products.  In the event that our financial condition inhibits our ability to pay
license fees or royalty payments due under our license agreements, our rights to
use,  transfer or sublicense those licenses could be jeopardized in the event of
a default  in  payment of fees or  royalties.  The loss of any of the  foregoing
licenses  could have a materially  adverse  effect on our ability to produce our
products or introduce new HIV diagnostic  products in countries covered by those
patents since the license agreements provide necessary  proprietary processes or
components for the manufacture of our products.


We May Not be Able to Successfully  Develop and Market New Products That We Plan
to Introduce.

We plan to develop  and/or  commercialize  other  urine-based,  serum-based  and
oral-fluid based diagnostic products including our rapid HIV-1/2 screening tests
and tests for other infectious  diseases or health  conditions.  We also plan to
develop,   along  with  the  United  States  Centers  for  Disease  Control  and
Prevention,  a  blood-based  rapid  HIV test  for  diagnostic  and  surveillance
purposes.  There are  numerous  developmental  and  regulatory  issues  that may
preclude the  introduction  of these  products into  commercial  sale. If we are
unable to demonstrate the feasibility of these products,  successfully  transfer
the technology for  commercial-scale  manufacturing  to either  internal,  joint
venture or outsourced  manufacturers or meet regulatory  requirements or resolve
potential patent licensing or government  distribution or licensing requirements
with  respect  to their  marketing,  we may have to  abandon  them and alter our
business  plan.  Such  modifications  to our  business  plan will  likely  delay
achievement of sustainable cash flow from product sales and profitability.  As a
result, we may have to seek additional financing,  which may not be available on
the  timetable  required or on acceptable  terms,  or we may have to curtail our
operations, or both.


                                       10


The Time  Needed to Obtain  Regulatory  Approvals  and  Respond  to  Changes  in
Regulatory Requirements Could Adversely Affect Our Business.

Our existing and proposed  products are subject to regulation by the Chinese FDA
(the  SFDA),  the FDA and other  governmental  or  public  health  agencies.  In
particular,  we are subject to strict governmental  controls on the development,
manufacture,  labeling, distribution and marketing of our products. In addition,
we are often  required to obtain  approval or  registration  with other  foreign
governments  or regulatory  bodies before we can import and sell our products in
these countries.

The process of obtaining  required  approvals or clearances from governmental or
public  health  agencies can involve  lengthy and detailed  laboratory  testing,
human clinical  trials,  sampling  activities  and other costly,  time-consuming
procedures.  The  submission  of an  application  to the SFDA,  the FDA or other
regulatory  authority does not guarantee that an approval or clearance to market
a product will be received.  Each authority may impose its own  requirements and
delay or refuse to grant  approval or clearance,  even though a product has been
approved in another country or by another agency.

Moreover, the approval or clearance process for a new product can be complex and
lengthy.  This time span  increases our costs to develop new products as well as
the risk that we will not succeed in introducing or selling.

Newly  promulgated  or  changed  regulations  could  also  require us to undergo
additional trials or procedures,  or could make it impractical or impossible for
us to market our products for certain uses, in certain markets, or at all.


Failure to Comply With SFDA, FDA or Similar  International  Regulatory Bodies or
Other  Requirements  May Require Us to Suspend  Production of Our Products Which
Could Result in a Loss of Revenues.

We can  manufacture  and sell  products,  both in China,  the United  States and
elsewhere abroad, only if we comply with regulations of government agencies such
as the  SFDA and the  FDA.  We have  implemented  or plan to  implement  quality
assurance  and  other  systems  that are  intended  to  comply  with  applicable
government  regulations  with regard to both our planned  manufacturing in China
and our contract manufacturing operations.

The SFDA, the FDA, or another  government or public health agency could force us
to stop manufacturing our products if it concludes that we are out of compliance
with applicable regulations. They could also require us to recall products if we
fail to  comply  with  applicable  regulations,  which  could  force  us to stop
manufacturing  such products.  Either of these events would result in a material
adverse effect on our business.

We Have No Experience Marketing a Rapid Test.

We have no experience  marketing and selling  rapid test  products.  Our success
depends upon alliances with  third-party  international  distributors  and joint
venture  partners  and upon our ability with such  distributors  and partners to
penetrate expanded markets. There can be no assurance that:

o     our international distributors and joint ventures will successfully market
      our products;

o     our  future  selling  efforts  will  be  effective,  as we  have  not  yet
      introduced  either an HIV-1/2  product or a rapid point of care test, both
      of which are necessary in many areas of the world;

o     we  will  obtain  market  acceptance  in  the  medical  or  public  health
      community, including governments and humanitarian funding sources critical
      in many international  markets,  which are essential for acceptance of our
      products; or

o     if our  relationships  with  distributors  terminate,  we  will be able to
      establish  relationships with other distributors on satisfactory terms, if
      at all.


                                       11


We May Need to Establish  Additional  Collaborative  Agreements,  and this Could
Have a Negative  Effect on Our Freedom to Operate Our  Business or Profit  Fully
from Sales of Our Products.

We may seek to collaborate with other companies to gain access to their research
and development,  manufacturing,  marketing and financial resources. However, we
may not be able to negotiate  arrangements  with any  collaborative  partners on
acceptable terms. Any collaborative relationships that we enter into may include
restrictions  on our freedom to operate our business or to profit fully from the
sales of our products.

Once a collaborative  arrangement is established,  the collaborative partner may
discontinue  funding any particular program or may, either alone or with others,
pursue  alternative  technologies for the protects or diseases we are targeting.
Competing  products,  developed  by  a  collaborative  partner  or  to  which  a
collaborative  partner  has  rights,  may  result in the  collaborative  partner
withdrawing support as to all or a portion of our technology.

Without  collaborative   arrangements,   we  must  fund  our  own  research  and
development activities,  accelerating the depletion of our capital and requiring
us to develop our own  marketing  capabilities.  Therefore,  if we are unable to
establish  and  maintain  collaborative  arrangements,  we  could  experience  a
material  adverse effect on our ability to develop products and, once developed,
to market them successfully.


Our Research,  Development and Commercialization  Efforts May Not Succeed or Our
Competitors  May  Develop  and   Commercialize   More  Effective  or  Successful
Diagnostic Products.

In order to remain competitive,  we must regularly commit substantial  resources
to research and development and the commercialization of new products.

The research and development  process  generally  takes a significant  amount of
time and money from  inception to  commercial  product  launch.  This process is
conducted in various stages.  During each stage there is a substantial risk that
we will not achieve our goals on a timely  basis,  or at all, and we may have to
abandon a product in which we have invested substantial amounts of money.

During the three  months  ended March 31, 2005 and the year ended  December  31,
2004, we incurred $0.8 million and $2.1 million,  respectively,  in research and
development  expenses.  We expect to  continue to incur  significant  costs as a
result of our research and development activities in the future.

A primary  focus of our  efforts  has been,  and is  expected to continue to be,
rapid HIV tests that we are  commercializing or that are in the process of being
developed.  However,  there  can be no  assurance  that we will  succeed  in our
commercialization of these tests or in our research and development efforts with
respect to rapid tests or other technologies or products.

Successful  products require significant  development and investment,  including
testing,  to  demonstrate  their  cost-effectiveness  or other benefits prior to
commercialization. In addition, regulatory approval must be obtained before most
products may be sold. Regulatory  authorities may not approve these products for
commercial sale. In addition,  even if a product is developed and all applicable
regulatory  approvals  are  obtained,  there may be little or no market  for the
product at a price that will allow us to earn a reasonable  profit, or we may be
unable to obtain the requisite  licenses to sell the product or to qualify for a
government  tender,  which are often requirements in third world countries where
the  greatest  need  and  largest  market  for HIV  diagnostic  testing  exists.
Accordingly,  if we fail to  develop  commercially  successful  products,  or if
competitors  develop more  effective  products or a greater number of successful
new products,  or there are  governmental  limitations  affecting our ability to
sell our  products,  customers  may  decide  to use  products  developed  by our
competitors.  This  would  result in a loss of  current  or  anticipated  future
revenues  and  adversely  affect  our  results  of  operations,  cash  flows and
business.


                                       12


We Face Intense  Competition in the Medical Diagnostic Products Market and Rapid
Technological Advances by Competitors.

Competition  in our  diagnostic  market is intense and we expect it to increase.
Many of our competitors  have  significantly  greater  financial,  marketing and
distribution  resources than we do. Our competitors may succeed in developing or
marketing  technologies  and  products  that are more  effective  than ours.  In
addition,  if  acceptance  for  oral  fluid  or urine  testing  expands,  we may
experience  competition  from  companies  in areas where  intellectual  property
rights may not be as stringent as in the United States. These developments could
render our  technologies  or products  obsolete or  noncompetitive  or otherwise
affect our ability to increase or maintain our products' market share.  Further,
the greater  resources of our competitors could enable them to develop competing
products  more quickly so as to make it  difficult  for us to develop a share of
the market for these products. By having greater resources,  our competitors may
also be able to respond more quickly to  technology  changes in the  marketplace
and may be able to obtain regulatory  approval for products more quickly than we
can. Our future  success will depend on our ability to remain  competitive  with
other developers of medical devices and therapies.


A Viable Market for Our Products May Not Develop.

Our future  success  will depend,  in part,  on the market  acceptance,  and the
timing of such acceptance, of new products such as our rapid HIV tests currently
being  commercialized,  rapid HIV tests that we expect to develop  and other new
products or  technologies  that may be developed or acquired.  To achieve market
acceptance,  we must make substantial  marketing  efforts and spend  significant
funds to inform potential  customers and the public of the perceived benefits of
these  products.  We currently  have limited  resources  with which to stimulate
market interest in and demand for our products and limited  evidence on which to
evaluate the market's reaction to products that may be developed.  Consequently,
there can be no assurance  that any products will obtain market  acceptance  and
fill the market need that is perceived to exist.


Our Success Depends on Our Ability to Protect Our Proprietary Technologies.

The  medical  diagnostics  test  industry  places  considerable   importance  on
obtaining  patent,  trademark,  and trade  secret  protection,  as well as other
intellectual property rights, for new technologies,  products and processes. Our
success  depends,  in part,  on our  ability  to develop  and  maintain a strong
intellectual  property  portfolio or to obtain  licenses to patents for products
and technologies, both in the United States and in other countries.

As  appropriate,  we  intend  to file  patent  applications  and  obtain  patent
protection  for  our  proprietary  technology.  These  patent  applications  and
patents,  when filed,  are intended to cover,  as  applicable,  compositions  of
matter for our  products,  methods of making  those  products,  methods of using
those  products,  and  apparatus  relating  to the use or  manufacture  of those
products.  We  will  also  rely  on  trade  secrets,  know-how,  and  continuing
technological  advancements  to protect our  proprietary  technology.  There is,
however,  no assurance  that we will be  successful  in  obtaining  the required
patent  protection or that such protection will be enforced in certain countries
in which we compete.

We have entered,  and will continue to enter,  into  confidentiality  agreements
with our employees,  consultants,  advisors and  collaborators.  However,  these
parties may not honor these  agreements  and we may not be able to  successfully
protect  our  rights to  unpatented  trade  secrets  and  know-how.  Others  may
independently  develop  substantially  equivalent  proprietary  information  and
techniques or otherwise gain access to our trade secrets and know-how.

Many of our  employees,  including  scientific and  management  personnel,  were
previously employed by competing companies. Although we encourage and expect all
of  our  employees  to  abide  by any  confidentiality  agreement  with a  prior
employer,  competing  companies may allege trade secret  violations  and similar
claims against us.

We have  collaborated  in the past and expect to  collaborate in the future with
universities and governmental  research  organizations  which, as a result,  may
acquire part of the rights to any  inventions or technical  information  derived
from collaboration with them.


                                       13


We may incur substantial costs and be required to expend  substantial  resources
in asserting or protecting our  intellectual  property  rights,  or in defending
suits against us related to intellectual  property  rights.  Disputes  regarding
intellectual  property rights could  substantially  delay product development or
commercialization  activities.  Disputes regarding  intellectual property rights
might  include  state,  federal or foreign  court  litigation  as well as patent
interference,  patent  reexamination,  patent reissue,  or trademark  opposition
proceedings  in the United  States Patent and  Trademark  Office.  Opposition or
revocation  proceedings  could be  instituted  in a foreign  patent  office.  An
adverse decision in any proceeding regarding  intellectual property rights could
result in the loss or  limitation  of our rights to a patent,  an  invention  or
trademark.


Our Quarterly  Results May Fluctuate  Due to Certain  Regulatory,  Marketing and
Competitive Factors Over Which We Have Little or No Control.

The  factors  listed  below,  some of which we  cannot  control,  may  cause our
revenues and results of operations to fluctuate significantly:

o     actions taken by the FDA or foreign regulatory bodies relating to products
      we are commercializing or seeking to develop;

o     the extent to which our  current or  proposed  new  products  gain  market
      acceptance;

o     the timing and size of purchases by our customers,  distributors  or joint
      venture partners;

o     introductions of alternative means for testing for HIV by competitors;

o     changes in the way regulatory authorities evaluate HIV testing,  including
      supplemental testing of the results of a rapid HIV screening test; and

o     customer  concerns  about the stability of our business  which could cause
      them to seek alternatives to our product.

We Rely on Sole  Source  Suppliers  that We Cannot  Quickly  Replace for Certain
Components Critical to the Manufacture of Our Products.

Among the critical items we purchase from  qualified  sole source  suppliers are
various conjugates,  fetal bovine serum, and HIV-positive and HIV-negative urine
samples.  Any delay or  interruption in the supply of these or other sole source
components could have a material adverse effect on us by significantly impairing
our or our contract manufacturer's ability to manufacture products in sufficient
quantities,  particularly as we increase our manufacturing activities in support
of commercial sales. In addition, if our financial condition impairs our ability
to pay for critical  components  on a timely  basis,  our suppliers may delay or
cease selling  critical  components to us, which could also restrict our ability
to manufacture.  We typically do not have long-term supply agreements with these
suppliers, relying instead on periodic purchase orders to acquire materials with
the result  that  suppliers  could  delay or decline  to ship  components  until
payment is made in advance or on a COD basis.

We Engage Contract Manufacturers to Produce Some of Our Products,  Including Our
Rapid Tests Currently Being Commercialized.

We have  engaged a contract  manufacturer  in  Thailand to produce our rapid HIV
tests and we plan to establish  manufacturing  operations  in China  through our
affiliate.  We intend to subsequently introduce a new line of products using the
recently  acquired  Ani  technology  platform,  and  again  expect  to  rely  on
outsourced  or  overseas  manufacturing  organizations.   Additionally,  we  may
consider a  contract  manufacturing  arrangment  for the  production  of our BED
Incidence  test.  Initially,  none of these entities will have more than limited
experience, if any, in manufacturing our products and will have no experience in
manufacturing them in commercial quantities. While outsourcing our manufacturing
processes to contract  manufacturers  may permit us to expand our  manufacturing
capacity more quickly, it may also subject us to problems in such areas as:

o     transferring  the technology from the laboratory or pilot operation to the
      contract manufacturer on a commercial scale;


                                       14


o     lack of technical knowledge regarding regulated procedures;

o     uncertain or unreliable production yields;

o     maintaining quality control and assurance;

o     regulatory compliance,  since most rapid test manufacturers do not produce
      products that are as stringently controlled as HIV diagnostics;

o     misappropriation  of  intellectual   property,   particularly  in  foreign
      countries where patent protection is less stringent,  and depending on the
      extent of manufacturing processes that are outsourced;

o     developing market acceptance for new product;

o     production yields;

o     quality control and assurance;

o     raw material supply; and

o     shortages of qualified personnel.

Any of these  problems  could  affect our  ability to meet  increases  in demand
should our products  gain market  acceptance  and could impede the growth of our
sales revenues.


The  Success  of Our Plans to Enter  International  Markets  May Be  Limited  or
Disrupted  Due to Risks  Related to  International  Trade and  Marketing and the
Capabilities of Our Distributors, Manufacturers and Joint Venture Partners.

As a result of implementing our restructuring  plan, we expect that our revenues
will now be generated  from sales of our current or planned  incidence and rapid
tests, largely to international  distributors and/or joint ventures.  We believe
that our  alternative  fluid-based  tests can  provide  significant  benefits in
countries that do not have the facilities or personnel to safely and effectively
collect  and test  blood  samples.  To  date,  however,  sales to  international
customers have accounted for only a small proportion of our sales. In our fiscal
years ended December 31, 2004 and 2003,  international  sales accounted for only
approximately  16% and 15%,  respectively,  of our  revenues.  A majority of the
companies  with  which we compete in the sale of HIV  screening  tests  actively
market their  diagnostic  products  outside of the United States.  Manufacturers
from Japan, Canada,  Europe, and Australia offer a number of HIV screening tests
in those markets, including HIV-1/2 rapid tests, which are not approved for sale
in the U.S.  market.  There can be no assurance  that our products  will compete
effectively  against these products in foreign markets.  The following risks may
limit or disrupt the success of our international efforts:

o     the imposition of government controls (regulatory approval);

o     export license requirements;

o     political and economic instability;

o     trade restrictions;

o     changes in tariffs;

o     difficulties   in  managing   international   operations   (difficulty  in
      establishing  a  relationship  with a foreign  distributor,  joint venture
      partner,  or  contract  manufacturer  with the  financial  and  logistical
      ability to maintain quality control of product);

o     the ability to secure  licenses for  intellectual  property or  technology
      that are  necessary  to  manufacture  or sell our products in the selected
      countries;

o     fluctuations in foreign currency exchanges rates;

o     the  financial  stability of our  distributors  and/or their  expertise in
      obtaining local country regulatory approvals;


                                       15


o     the  financial  capabilities  of potential  customers in  lesser-developed
      countries or, alternatively, our inability to obtain approvals which would
      enable such countries access to outside financing, such as the World Bank;

o     the  ability  of  our   distributors  to  successfully   sell  into  their
      contractual  market  territory  or  to  successfully  cover  their  entire
      territory;

o     the  possibility  that  a  distributor  may  be  unable  to  meet  minimum
      contractual commitments;

o     establishing market awareness; and

o     external conditions such as regional  conflicts,  health crises or natural
      disasters.

Some of our distributors have limited international marketing experience.  There
can be no assurance that these distributors will be able to successfully  market
our  products in foreign  markets.  Any such  failure  will delay or disrupt our
plans to expand our business.

The Chinese  Government Could Change Its Policies Toward Private  Enterprises or
Even  Nationalize or Expropriate  Them,  Which Could Result in the Total Loss of
Business in That Country.

We have  established  a joint  venture  in China  with an entity  related to our
largest  stockholder  through which we are planning to manufacture  and sell our
products.   Our   business  in  China  is  subject  to   political  or  economic
uncertainties  and may be adversely  affected by political,  economic and social
developments in China. Over the past decade,  the Chinese government has pursued
economic  reform  policies,  including  the  encouragement  of private  economic
activity  and greater  economic  decentralization.  The Chinese  government  may
choose to end these policies or alter them  significantly  to our detriment with
little, if any, notice.

Changes in policies,  laws and  regulations  or in their  interpretation  or the
imposition of taxation,  restrictions  on currency  conversion,  restrictions or
devaluations  of currency,  nationalization  or other  expropriation  of private
enterprises  could  have a material  adverse  effect on our  business  in China.
Nationalization  or expropriation  could result in the total loss of business in
China.

An Economic  Downturn or Terrorist  Attacks May Adversely Affect Our Business or
Our Customers May Not Be Able to Satisfy Their  Contractual  Obligations  and We
May Not Be Able to Deliver Our Products as a Result of the Impact of  Conditions
Such as Certain World Events or Natural Disasters.

Changes in economic conditions could adversely affect our business. For example,
in a difficult  economic  environment,  customers  may be unwilling or unable to
invest in new  diagnostic  products,  may elect to  reduce  the  amount of their
purchases or may perform less HIV testing.  A weakening  business  climate could
also  cause  longer  sales  cycles  and slower  growth,  and could  expose us to
increased  business or credit risk in dealing with customers  adversely affected
by economic conditions.

Terrorist attacks and subsequent  governmental  responses to these attacks could
cause further  economic  instability or lead to further acts of terrorism in the
United  States and  elsewhere.  These actions could  adversely  affect  economic
conditions  outside  the  United  States  and  reduce  demand  for our  products
internationally. Terrorist attacks could also cause regulatory agencies, such as
the FDA or agencies that perform similar functions outside the United States, to
focus their  resources  on vaccines  or other  products  intended to address the
threat of  biological or chemical  warfare.  This  diversion of resources  could
delay our ability to obtain regulatory approvals required to manufacture, market
or sell our products in the United States and other countries.

Our business model and future revenue forecasts call for a significant expansion
of sales in the People's  Republic of China as well as in Africa upon successful
commercialization  of our rapid products.  Should conditions beyond our control,
such as disease outbreaks,  natural disasters, war or political unrest, redirect
attention from the worldwide HIV/AIDS  epidemic,  our customers' ability to meet
their  contractual  purchase  obligations  and/or our ability to supply  product


                                       16


internationally  for either  evaluation  or  commercial  use may prevent us from
achieving  the  revenues  we have  projected.  As a result,  we may have to seek
additional  financing  beyond  that  which we have  projected,  which may not be
available  on the  timetable  required  or on  acceptable  terms  that  are  not
substantially  dilutive  to our  stockholders,  or we may  have to  curtail  our
operations, or both.

Our Research and  Development  of HIV Urine Tests Involves the Controlled Use of
Hazardous Materials.

There can be no assurance that our safety  procedures for handling and disposing
of hazardous  materials such as azide will comply with  applicable  regulations.
For example,  azide,  when present in high  concentrations  and not diluted with
water,  can  have  an  explosive  reaction.  Azide  is  a  chemical  used  as  a
preservative  in our  kits.  In  addition,  we  cannot  eliminate  the  risk  of
accidental  contamination or injury from these materials.  We may be held liable
for  damages  from such an  accident  and that  liability  could have a material
adverse effect on our business.

As a Small  Manufacturer  of  Medical  Diagnostic  Products,  We Are  Exposed to
Product  Liability and Recall Risks For Which  Insurance  Coverage is Expensive,
Limited and Potentially Inadequate.

We  manufacture  medical  diagnostic  products,  which  subjects  us to risks of
product liability claims or product recalls,  particularly in the event of false
positive or false negative  reports.  A product  recall or a successful  product
liability  claim or claims  that  exceed  our  insurance  coverage  could have a
material  adverse effect on us. We maintain a $10,000,000  claims made policy of
product liability insurance.  However, product liability insurance is expensive.
In the future we may not be able to obtain  coverage on acceptable  terms, if at
all.  Moreover,  our  insurance  coverage  may not  adequately  protect  us from
liability  that we incur in  connection  with  clinical  trials  or sales of our
products.


                           FORWARD-LOOKING INFORMATION

This  Prospectus  and the documents  incorporated  by reference  herein  contain
forward-looking   statements  within  the  meaning  of  the  Private  Securities
Litigation  Reform Act of 1995. In addition,  from time to time,  information we
provide  or  statements  made  by  our  directors,  officers  or  employees  may
constitute forward-looking statements. Such forward-looking statements are based
on current expectations and are subject to uncertainties and other factors which
may involve known and unknown risks that could cause our actual results,  levels
of  activity,  performance  or  achievements  to differ  materially  from  those
projected or implied.  Forward-looking statements include information concerning
our possible or assumed future results of operations and statements preceded by,
followed by or including the words  "believes,"  "plans,"  "anticipates,"  "will
likely result," "will continue,"  "projects," "expects," and similar expressions
are  intended to identify  "forward-looking  statements".  Such  statements  are
subject to certain risks and uncertainties, including those risks defined above.
We  caution  readers  not  to  place  undue  reliance  on  any   forward-looking
statements, which are based on certain assumptions and expectations which may or
may not be  valid or  actually  occur,  and  which  involve  certain  risks  and
uncertainties, including but not limited to:


o     fluctuations in our operating results;

o     announcements of technological innovations or new products which we or our
      competitors make;

o     FDA and international regulatory actions;

o     developments with respect to patents or proprietary rights;

o     changes in stock market analysts' recommendations regarding Calypte, other
      medical products companies or the medical product industry generally;

o     changes in domestic or  international  conditions  beyond our control that
      may  disrupt  our or our  customers'  or  distributors'  ability  to  meet
      contractual obligations;

o     changes in health care policy in the United States or abroad;

o     our ability to obtain  additional  financing as necessary to fund both our
      long-and short-term business plans;


                                       17


o     fluctuations in market demand for and supply of our products;

o     public  concern as to the safety of products that we or others develop and
      public concern regarding HIV and AIDS;

o     availability of reimbursement  for use of our products from private health
      insurers,   governmental  health  administration   authorities  and  other
      third-party payors;

o     price and volume  fluctuations  in the stock  market at large which do not
      relate to our operating performance;

o     growth of our market and customers;

o     our objectives and plans for future operations and products; and

o     our liquidity and capital resources.

For a further  discussion of these and other significant  factors to consider in
connection  with  forward-looking   statements,   see  the  discussion  in  this
Prospectus under the heading "RISK FACTORS."


                                 USE OF PROCEEDS

We will not  receive  any  proceeds  from the sale of our common  stock  offered
through this Prospectus by the selling security  holders.  All proceeds from the
sale of our  common  stock sold under  this  Prospectus  will go to the  selling
security  holders.  However,  we will receive proceeds from the cash exercise of
common stock purchase  warrants held by the selling  security  holders,  if any,
that are  included in this  Prospectus.  We would  receive an aggregate of up to
approximately  $13.2  million if the selling  security  holders  exercise  their
common stock purchase warrants as follows:  (a) up to approximately $8.7 million
if the selling  security  holders  exercise  their Series A Warrants,  which are
presently out-of-the-money, at an exercise price of $0.325 per share, to acquire
26,991,666  shares of our common stock, (b) up to approximately  $3.9 million if
the  selling  security  holders  exercise  their  Series B  Warrants,  which are
presently out-of-the-money, at an exercise price of $0.325 per share, to acquire
12,146,250  shares of our common stock, (c) up to approximately  $0.4 million if
the selling  security  holders  exercise their fee warrants,  at exercise prices
ranging  from $0.23 to $0.30 per share,  to acquire an  aggregate  of  1,866,666
shares of our common stock,  and (d) up to $0.2 million if the selling  security
holder exercises its warrant, currently out-of-the-money,  issued in conjunction
with the $5,500,000 Credit Facility Agreement, at an exercise price of $0.40 per
share to acquire 500,000 shares of our common stock. Such proceeds, if any, will
be used for working  capital and other  general  corporate  purposes,  including
without  limitation,  the  commercialization  of our HIV-1/2 Rapid Tests and the
development of diagnostic tests for other sexually transmitted diseases. Certain
warrants  held by the  selling  security  holders  may be  exercised  through  a
cashless  exercise  in certain  circumstances  while the  underlying  shares are
unregistered,  in  which  event we  would  not  receive  any  proceeds  from the
exercise.

In connection  with the private  placement of the Secured 8% Senior  Convertible
Promissory Notes, we received net proceeds of approximately  $7,667,500 from the
sale of an  aggregate  of $8.0  million in  principal  amount of the  Secured 8%
Senior  Convertible  Promissory  Notes,  net of  placement  fees of $332,500 and
related  transaction  costs  estimated  to be an  additional  $130,000.  We used
$2,000,000 of the net proceeds to repay a 7%  Promissory  Note issued to Marr in
January 2005.  The balance of the proceeds will be used for working  capital and
general corporate purposes,  including without limitation, the commercialization
of our HIV-1/2 Rapid Tests and the  development  of  diagnostic  tests for other
sexually transmitted diseases.


                            SELLING SECURITY HOLDERS

The  number  of  shares  set  forth in the  table  for the  various  subscribers
represents  the  number of shares of common  stock to be  offered  by them.  The
actual number of shares of common stock offered in this Prospectus, and included
in the registration  statement of which this Prospectus is a part, includes such
additional  number of shares of common  stock as may be issued or issuable  upon
exercise  of warrants by reason of any stock  split,  stock  dividend or similar
transaction  involving the common stock,  in accordance  with Rule 416 under the
Securities Act of 1933, as amended.  Other than as disclosed in this Prospectus,


                                       18


no  selling  security  holder  has had any  position,  office or other  material
relationship  with us during the past three years.  Marr Technologies BV (Marr),
our largest  stockholder,  holds approximately 27% of our currently  outstanding
stock and has  identified  itself as our  affiliate  in public  filings with the
Commission. In conjunction with an aggregate investment of $12.5 million by Marr
during  2003,  for  which  the  underlying  shares  are  not  included  in  this
Prospectus,  the Nominating Committee of our Board of Directors granted Marr the
right  to  nominate  two  mutually-agreeable  representatives  to our  Board  of
Directors.  During 2004, we added two directors  initially  nominated by Marr to
our  Board of  Directors.  Marr is also our joint  venture  partner  in  Beijing
Calypte Biomedical  Technology Ltd., which was created to market our products in
the People's Republic of China.


The  applicable  percentage  of ownership  listed below is based on  171,908,903
shares of common stock outstanding as of June 24, 2005.



                                                Common Stock
                                             Beneficially Owned       Common Stock       Common Stock Beneficially Owned
                                             Prior to Offering     Offered Hereby (b)          After Offering (b)
                                                    (a)
                                            ------------------------------------------------------------------------------
                  Holder                              Number                Number                Number        Percent
                                                                                                    
SF Capital Partners Ltd.                      (1)     18,408,000    (8)     34,989,524             9,714,924        5.54%
Marr Technologies BV                          (2)     59,062,225    (9)     24,992,666            46,915,151       27.21%
Morningtown Limited                           (3)      1,530,333   (10)      3,936,321                   -0-            *
Smithfield Fiduciary LLC                      (4)      1,700,371   (11)      4,373,691                   -0-            *
Iroquois Master Fund Ltd.                     (5)        850,185   (12)      2,186,845                   -0-            *
Capstone Investments                          (6)        300,000   (13)        533,333               300,000            *
Merchant Intercapital Corporation             (7)        731,572   (14)      2,186,203               400,000            *
                                                   -------------         -------------         -------------
                                                      82,582,686            73,198,583            57,330,075       32.20%
                                                   =============         =============         =============




- ----------
*     Represents beneficial ownership of less than 1%
(a)   The agreements under which shares are being registered  contain percentage
      ownership  restrictions  and  restrictions  which  prevent the exercise of
      warrants  within the next 60 days. As noted in the footnotes  herein,  the
      restrictions  limit the number of shares  reported as  beneficially  owned
      prior to the  offering.  (b) Assumes all shares  included in this offering
      are sold by the selling security holder.


(1)   SF Capital  Partners Ltd.'s primary offices are located at 3600 South Lake
      Drive, St. Francis,  WI 53235.  Michael A. Roth and Brian J. Stark possess
      voting and  dispositive  power over all of the shares  owned by SF Capital
      Partners Ltd. This number  includes  6,214,924  shares of common stock and
      3,500,000  shares of common stock  issuable  upon exercise of warrants not
      included in this offering.  Under the terms of the 8% Secured  Convertible
      Promissory  Notes (the "Notes") and warrants  ("Warrants")  acquired by SF
      Capital Partners Ltd. in April 2005, SF Capital may convert the Notes into
      13,333,333  shares of our common  stock and the  Warrants may be exercised
      for  the  purchase  of  19,333,333  shares  of our  common  stock.  We are
      registering  all of the shares of common  stock  underlying  the Notes and
      Warrants in this registration statement.  The Warrants are not exercisable
      prior to October 4, 2005 and, accordingly, are excluded from the number of
      shares beneficially owned prior to the offering. The Notes are convertible
      only to the  extent  that the  number of shares of common  stock  issuable
      pursuant to the Notes or Warrants,  together  with the number of shares of
      common stock owned by SF Capital (but not including shares of common stock
      underlying  unconverted  portions of the Notes or unexercised  portions of
      the Warrants) would not exceed 9.999% of the then-outstanding common stock
      as  determined  in  accordance  with Section  13(d) of the  Exchange  Act.
      Accordingly,  the number of shares of stock shown as beneficially owned by
      SF  Capital   prior  to  this   offering  is  limited  to  9.999%  of  the
      then-outstanding  shares.  In the  absence of  ownership  limitations,  SF
      Capital would  beneficially  own  23,317,887  shares or 12.34%,  including
      269,630  shares  underlying  convertible  notes  issuable  in  payment  of
      interest on the Notes within 60 days, of our then-outstanding common stock
      as determined in accordance with Section 13(d) of the Exchange Act.


(2)   Marr Technologies,  BV is engaged in the business of investing in publicly
      traded equity securities for its own account.  Marr Technologies'  primary
      offices  are  located  at  Strawinskylaan  1431,  1077XX  Amsterdam,   The
      Netherlands.   Marat  Safin  has  voting  and   investment   control  over
      investments  held by Marr  Technologies.  This number includes  46,415,151
      shares of common stock and 500,000  shares of common stock  issuable  upon
      exercise of warrants not included in this offering. Under the terms of the
      8%  Secured  Convertible  Promissory  Notes  (the  "Notes")  and  warrants
      ("Warrants")  acquired by Marr in April  2005,  Marr may convert the Notes
      into  9,333,333  shares  of our  common  stock  and  the  Warrants  may be
      exercised for the purchase of 14,033,333  shares of our common stock. This
      figure also includes 188,741 shares of common stock underlying convertible
      notes which may be issued in payment of  interest  on the Notes  within 60
      days. We are registering all of the shares of common stock  underlying the
      Notes and Warrants in this  registration  statement.  The Warrants are not
      exercisable prior to October 4, 2005 and,  accordingly,  are excluded from
      the number of shares beneficially owned prior to the offering. Marr is not
      subject to any percentage ownership limitations.


                                       19


(3)   Morningtown  Limited is engaged in the  business of  investing in publicly
      traded  equity  securities  for its  own  account.  Morningtown's  primary
      offices are located at 2nd Floor, Barkly Wharf, Le Caudan Waterfront, Port
      Louis,  Mauritius.  Janak Kumar Basnet has voting and  investment  control
      over  investments  held by Morningtown.  Under the terms of the 8% Secured
      Convertible  Promissory  Notes (the  "Notes")  and  warrants  ("Warrants")
      acquired by Morningtown in April 2005,  Morningtown  may convert the Notes
      into  1,500,000  shares  of our  common  stock  and  the  Warrants  may be
      exercised for the purchase of 2,175,000  shares of our common stock.  This
      figure also includes 30,333 shares of common stock underlying  convertible
      notes which may be issued in payment of  interest  on the Notes  within 60
      days. We are registering all of the shares of common stock  underlying the
      Notes and Warrants in this  registration  statement.  The Warrants are not
      exercisable prior to October 4, 2005 and,  accordingly,  are excluded from
      the number of shares beneficially owned prior to the offering. Morningtown
      is  subject  to a  9.999%  ownership  limitation  which  is not  currently
      applicable.

(4)   Smithfield  Fiduciary  LLC is  engaged in the  business  of  investing  in
      publicly  traded  equity  securities  for  its own  account.  Smithfield's
      primary offices are located in care of Highbridge  Capital Management LLC,
      9 West 57th Street,  27th Floor,  New York, NY 10019.  Highbridge  Capital
      Management,  LLC is the trading  manager of  Smithfield  Fiduciary LLC and
      consequently has voting control and investment  discretion over securities
      held by Smithfield.  Glenn Dubin and Henry Swieca control Highbridge. Each
      of Highbridge, Glenn Dubin and Henry Swieca disclaims beneficial ownership
      of the securities  held by  Smithfield.  Under the terms of the 8% Secured
      Convertible  Promissory  Notes (the  "Notes")  and  warrants  ("Warrants")
      acquired by  Smithfield  in April 2005,  Smithfield  may convert the Notes
      into  1,666,667  shares  of our  common  stock  and  the  Warrants  may be
      exercised for the purchase of 2,416,667  shares of our common stock.  This
      figure also includes 33,704 shares of common stock underlying  convertible
      notes which may be issued in payment of  interest  on the Notes  within 60
      days. We are registering all of the shares of common stock  underlying the
      Notes and Warrants in this  registration  statement.  The Warrants are not
      exercisable prior to October 4, 2005 and,  accordingly,  are excluded from
      the number of shares beneficially owned prior to the offering.  Smithfield
      is  subject  to a  9.999%  ownership  limitation  which  is not  currently
      applicable.

(5)   Iroquois  Master Fund Ltd.  is engaged in the  business  of  investing  in
      publicly traded equity  securities for its own account.  Iroquois' primary
      offices are located at 641  Lexington  Avenue,  26th Floor,  New York,  NY
      10022. Joshua Silverman has voting and investment control over investments
      held  by  Iroquois  Master  Fund.  Under  the  terms  of  the  8%  Secured
      Convertible  Promissory  Notes (the  "Notes")  and  warrants  ("Warrants")
      acquired by Iroquois  in April 2005,  Iroquois  may convert the Notes into
      833,333  shares of our common stock and the Warrants may be exercised  for
      the purchase of  1,208,333  shares of our common  stock.  This figure also
      includes 16,852 shares of common stock underlying  convertible notes which
      may be issued in payment of interest on the Notes  within 60 days.  We are
      registering  all of the shares of common  stock  underlying  the Notes and
      Warrants in this registration statement.  The Warrants are not exercisable
      prior to October 4, 2005 and, accordingly, are excluded from the number of
      shares beneficially owned prior to the offering.  Iroquois is subject to a
      9.999% ownership limitation which is not currently applicable.

(6)   Capstone  Investments  is engaged in the business of investing in publicly
      traded equity securities for its own account.  Capstone's  primary offices
      are located at 4660 La Jolla  Village  Drive,  Suite 1040,  San Diego,  CA
      92122.  Steven Capozza has voting and investment  control over investments
      held by Capstone  Investments.  This  number  includes  300,000  shares of
      common  stock  issuable  upon  exercise of warrants  not  included in this
      offering.  Capstone  was granted a warrant to purchase  533,333  shares of
      common  stock,  which  underlying  shares  are  being  registered  in this
      registration  statement,  but which is not exercisable prior to October 4,
      2005  Accordingly,  those  shares of common  stock are  excluded  from the
      number of shares beneficially owned prior to the offering.

(7)   Merchant Intercapital Corporation. is engaged in the business of investing
      in  publicly  traded  equity  securities  for  its own  account.  Merchant
      Intercapital's  primary  offices  are located at 115 E.57th  Street,  11th
      Floor,  New York,  NY,  10022.  Ronny M. Kraft has  voting and  investment
      control  over  investments  held by  Merchant  Intercapital.  This  number
      includes 400,000 shares of common stock issuable upon exercise of warrants
      and  options  not  included  in this  offering.  Under the terms of the 8%
      Secured   Convertible   Promissory   Notes  (the   "Notes")  and  warrants
      ("Warrants")  acquired by Merchant  Intercapital  in April 2005,  Merchant
      Intercapital may convert the Notes into 325,000 shares of our common stock
      and the Warrants may be  exercised  for the purchase of 471,250  shares of
      our common stock.  This figure also includes  6,572 shares of common stock
      underlying convertible notes which may be issued in payment of interest on
      the Notes within 60 days. We are  registering  all of the shares of common
      stock  underlying the Notes and Warrants in this  registration  statement.
      The  Warrants  are  not   exercisable   prior  to  October  4,  2005  and,
      accordingly,  are excluded  from the number of shares  beneficially  owned
      prior to the offering. Merchant Intercapital was also granted a warrant to
      purchase  1,333,333 shares of common stock,  which  underlying  shares are
      being  registered in this  registration  statement,  but which is also not
      exercisable prior to October 4, 2005  Accordingly,  those shares of common
      stock are excluded from the number of shares  beneficially  owned prior to
      the offering.


                                       20


(8)   Includes  13,333,333  shares  of  common  stock  that  are  issuable  upon
      conversion  of an 8% Secured  Convertible  Promissory  Note  issued to the
      selling  security  holder,  19,333,333  shares  of common  stock  that are
      issuable upon exercise of a Series A Warrant and a Series B Warrant issued
      to the selling  security holder and 2,322,858  shares of common stock that
      are issuable upon the conversion of 8% Secured  Convertible Notes that are
      issuable for payment of interest.

(9)   Includes   9,333,333  shares  of  common  stock  that  are  issuable  upon
      conversion  of an 8% Secured  Convertible  Promissory  Note  issued to the
      selling  security  holder,  13,533,333  shares  of common  stock  that are
      issuable upon exercise of a Series A Warrant and a Series B Warrant issued
      to the selling security holder,  1,626,000 shares of common stock that are
      issuable  upon the  conversion  of 8% Secured  Convertible  Notes that are
      issuable for payment of interest  and 500,000  shares of common stock that
      are issuable upon the exercise of a warrant issued to the selling security
      holder in conjunction with a $5,500,000 Credit Facility Agreement.

(10)  Includes   1,500,000  shares  of  common  stock  that  are  issuable  upon
      conversion  of an 8% Secured  Convertible  Promissory  Note  issued to the
      selling  security  holder,  2,175,000  shares  of  common  stock  that are
      issuable upon exercise of a Series A Warrant and a Series B Warrant issued
      to the selling security holder and 261,321 shares of common stock that are
      issuable  upon the  conversion  of 8% Secured  Convertible  Notes that are
      issuable for payment of interest.

(11)  Includes   1,666,667  shares  of  common  stock  that  are  issuable  upon
      conversion  of an 8% Secured  Convertible  Promissory  Note  issued to the
      selling  security  holder,  2,416,667  shares  of  common  stock  that are
      issuable upon exercise of a Series A Warrant and a Series B Warrant issued
      to the selling security holder and 290,357 shares of common stock that are
      issuable  upon the  conversion  of 8% Secured  Convertible  Notes that are
      issuable for payment of interest.

(12)  Includes  833,333 shares of common stock that are issuable upon conversion
      of an 8%  Secured  Convertible  Promissory  Note  issued  to  the  selling
      security  holder,  1,208,333 shares of common stock that are issuable upon
      exercise  of a Series A  Warrant  and a Series  B  Warrant  issued  to the
      selling  security  holder  and  145,179  shares of common  stock  that are
      issuable  upon the  conversion  of 8% Secured  Convertible  Notes that are
      issuable for payment of interest.

(13)  Includes  533,333  shares  of  common  stock  that are  issuable  upon the
      exercise  of a warrant  issued to the selling  security  holder as partial
      compensation for services as a placement agent.

(14)  Includes  325,000 shares of common stock that are issuable upon conversion
      of an 8%  Secured  Convertible  Promissory  Note  issued  to  the  selling
      security  holder,  471,250  shares of common stock that are issuable  upon
      exercise  of a Series A  Warrant  and a Series  B  Warrant  issued  to the
      selling security  holder,  56,620 shares of common stock that are issuable
      upon the conversion of 8% Secured  Convertible Notes that are issuable for
      payment of interest and 1,333,333 shares of common stock that are issuable
      upon the exercise of a warrant  issued to the selling  security  holder as
      partial compensation for services as a placement agent.

                       SUMMARY OF SHARES BEING REGISTERED

The following table  summarizes the shares of common stock being  registered for
resale by the  Selling  Security  holders,  which  shares may be  issuable  upon
conversion  of secured  convertible  promissory  notes or exercise of  warrants.
Dollar amounts are in thousands.



                                                                                                               SHARES
                                                                        SHARES       SHARES                   ISSUABLE
                                                           SHARES      ISSUABLE     ISSUABLE      SHARES       UNDER
                                 8% NOTE     8% NOTE      ISSUABLE      UNDER        UNDER       ISSUABLE    AGENT FEE      SHARES
                                  GROSS        NET         UNDER      SERIES A      SERIES B   FOR INTEREST   WARRANTS       BEING
INVESTOR                         AMOUNT      PROCEEDS      NOTES       WARRANTS     WARRANTS     ON NOTES    AND OTHER    REGISTERED
- ------------------------------ ----------   ----------   ----------   ----------   ----------   ----------   ----------   ----------
                                                                                                  
APRIL 2005 PLACEMENT
SF Capital Partners Ltd.       $    4,000   $    3,720   13,333,333   13,333,333    6,000,000    2,322,858           --   34,989,524
Marr Technologies BV                2,800        2,800    9,333,333    9,333,333    4,200,000    1,626,000           --   24,492,666
Morningtown Limited                   450          450    1,500,000    1,500,000      675,000      261,321           --    3,936,321
Smithfield Fiduciary LLC              500          465    1,666,667    1,666,667      750,000      290,357           --    4,373,691
Iroquois Master Fund Ltd.             250          232      833,333      833,333      375,000      145,179           --    2,186,845
Capstone Investments (1)               --           --           --           --           --           --      533,333      533,333
Merchant Intercapital Corp.(1)         --           --      325,000      325,000      146,250       56,620    1,333,333    2,186,203
                               ----------   ----------   ----------   ----------   ----------   ----------   ----------   ----------
April 2005 Placement           $    8,000   $    7,667   26,991,666   26,991,666   12,146,250    4,702,335    1,866,666   72,698,583
                               ----------   ----------   ----------   ----------   ----------   ----------   ----------   ----------
2005 CREDIT FACILITY
Marr Technologies, BV                  --           --           --           --           --           --      500,000      500,000
                               ----------   ----------   ----------   ----------   ----------   ----------   ----------   ----------
TOTAL                          $    8,000   $    7,667   26,991,666   26,991,666   12,146,250    4,702,335    2,366,666   73,198,583
                               ==========   ==========   ==========   ==========   ==========   ==========   ==========   ==========


- ----------
(1)   Reflects  shares  underlying  notes  and/or  warrants  issued  pursuant to
      placement agent agreements.


                                       21


                              PLAN OF DISTRIBUTION

The  Selling  Stockholders  and  any of  their  pledgees,  donees,  transferees,
assignees and successors-in-interest  may, from time to time, sell any or all of
their shares of Common Stock on any stock exchange,  market or trading  facility
on which the shares are traded or in private transactions. These sales may be at
fixed or negotiated prices. The Selling  Stockholders may use any one or more of
the following methods when selling shares:

o     ordinary   brokerage   transactions   and   transactions   in  which   the
      broker-dealer solicits Investors;

o     block trades in which the broker-dealer will attempt to sell the shares as
      agent but may  position  and resell a portion of the block as principal to
      facilitate the transaction;

o     purchases by a broker-dealer as principal and resale by the  broker-dealer
      for its account;

o     an exchange  distribution  in accordance  with the rules of the applicable
      exchange;

o     privately negotiated transactions;

o     to cover short sales made after the date that this Registration  Statement
      is declared effective by the Commission;

o     broker-dealers may agree with the Selling Stockholders to sell a specified
      number of such shares at a stipulated price per share;

o     a combination of any such methods of sale; and

o     any other method permitted pursuant to applicable law.

The  Selling  Stockholders  may  also  sell  shares  under  Rule 144  under  the
Securities Act, if available, rather than under this prospectus.

Broker-dealers engaged by the Selling Stockholders may arrange for other
brokers-dealers to participate in sales. Broker-dealers may receive commissions
or discounts from the Selling Stockholders (or, if any broker-dealer acts as
agent for the purchaser of shares, from the purchaser) in amounts to be
negotiated. The Selling Stockholders do not expect these commissions and
discounts to exceed what is customary in the types of transactions involved.


                                       22


The  Selling  Stockholders  may from  time to time  pledge  or grant a  security
interest in some or all of the Shares  owned by them and, if they default in the
performance of their secured  obligations,  the pledgees or secured  parties may
offer and sell shares of Common  Stock from time to time under this  prospectus,
or  under  an  amendment  to this  prospectus  under  Rule  424(b)(3)  or  other
applicable  provision of the Securities Act of 1933 amending the list of selling
stockholders to include the pledgee,  transferee or other successors in interest
as selling stockholders under this prospectus.

Upon the Company  being  notified in writing by a Selling  Stockholder  that any
material  arrangement has been entered into with a broker-dealer for the sale of
Common Stock through a block trade, special offering,  exchange  distribution or
secondary distribution or a purchase by a broker or dealer, a supplement to this
prospectus  will be  filed,  if  required,  pursuant  to Rule  424(b)  under the
Securities Act,  disclosing (i) the name of each such Selling Stockholder and of
the participating  broker-dealer(s),  (ii) the number of shares involved,  (iii)
the  price  at which  such  the  shares  of  Common  Stock  were  sold,  (iv)the
commissions paid or discounts or concessions  allowed to such  broker-dealer(s),
where  applicable,   (v)  that  such   broker-dealer(s)   did  not  conduct  any
investigation  to verify the information set out or incorporated by reference in
this prospectus, and (vi) other facts material to the transaction.  In addition,
upon the Company being notified in writing by a Selling Stockholder that a donee
or pledge  intends to sell more than 500 shares of Common Stock, a supplement to
this  prospectus  will be filed if then required in accordance  with  applicable
securities law.

The Selling  Stockholders  also may transfer the shares of Common Stock in other
circumstances,  in which case the  transferees,  pledgees or other successors in
interest will be the selling beneficial owners for purposes of this prospectus.

The Selling  Stockholders and any  broker-dealers or agents that are involved in
selling the shares may be deemed to be "underwriters"  within the meaning of the
Securities Act in connection  with such sales.  In such event,  any  commissions
received  by such  broker-dealers  or agents and any profit on the resale of the
shares  purchased  by them  may be  deemed  to be  underwriting  commissions  or
discounts  under the Securities  Act.  Discounts,  concessions,  commissions and
similar  selling  expenses,  if  any,  that  can be  attributed  to the  sale of
Securities will be paid by the Selling  Stockholder and/or the purchasers.  Each
Selling  Stockholder  has  represented  and  warranted  to the  Company  that it
acquired the securities  subject to this registration  statement in the ordinary
course of such Selling  Stockholder's  business and, at the time of its purchase
of such securities such Selling Stockholder had no agreements or understandings,
directly or indirectly, with any person to distribute any such securities.

Each  Selling  Stockholder  has  acknowledged  that  Shares  registered  on this
Registration Statement may not be used to cover short sales of Common Stock made
prior to the date on which this Registration  Statement shall have been declared
effective by the Commission.  If a Selling  Stockholder uses this prospectus for
any sale of the Common  Stock,  it will be subject  to the  prospectus  delivery
requirements of the Securities Act. The Selling Stockholders will be responsible
to comply with the applicable provisions of the Securities Act and Exchange Act,
and  the  rules  and  regulations  thereunder  promulgated,  including,  without
limitation,  Regulation  M,  as  applicable  to  such  Selling  Stockholders  in
connection  with  resales of their  respective  shares  under this  Registration
Statement.


                                       23


The  Company  is  required  to  pay  all  fees  and  expenses  incident  to  the
registration  of the shares,  but the Company will not receive any proceeds from
the sale of the Common  Stock.  The Company has agreed to indemnify  the Selling
Stockholders against certain losses, claims, damages and liabilities,  including
liabilities under the Securities Act.

                                  LEGAL MATTERS

The validity of the issuance of the shares being  offered  hereby will be passed
upon for us by Paula Winner Barnett, Esq., Encino, California.

                                     EXPERTS

The  consolidated  financial  statements,  incorporated  in this  prospectus  by
reference  to the  Annual  Report on Form  10-KSB/A  (No.  1) for the year ended
December 31,  2004,  have been so  incorporated  in reliance on the report of in
reliance upon the reports of Odenberg Ullakko  Muranishi & Co. LLP,  independent
auditors  and upon the  authority  of said firm as  experts  in  accounting  and
auditing.

                           INCORPORATION BY REFERENCE

The SEC allows us to  "incorporate  by reference"  the  information we file with
them, which means that we can disclose important information to you by referring
you to those documents.  The information incorporated by reference is considered
to be part of this Prospectus.


      o     Our Annual Report filed on Form 10-KSB/A (No. 2) for the fiscal year
            ended December 31, 2004;

      o     Our Quarterly Report on Form 10-QSB/A (No. 1) for the quarter ended
            March 31, 2005;

      o     Our Current Reports on Form 8-K filed on April 5, 2005, April 21,
            2005, and June 24, 2005;  and


      o     The  description of the common stock  contained in our  Registration
            Statement  filed on Form 8-A, as filed with the SEC on July 10, 1996
            and December 16, 1998.

Additionally,  all  documents we file with the SEC  pursuant to Sections  13(a),
13(c),  14 or 15(d) of the  Exchange Act after the date of this  prospectus  and
prior to the  termination  of the offering of the shares offered hereby shall be
deemed  to  be   incorporated  by  reference  into  this  prospectus  and  shall
automatically update and supersede this information.

We  will  provide,  without  charge,  to  each  person  to  whom a copy  of this
prospectus is delivered,  upon such person's written or oral request,  a copy of
any and all of the documents incorporated by reference in this prospectus (other
than  exhibits  to  such  documents,   unless  such  exhibits  are  specifically
incorporated   by  reference   into  the   information   that  this   prospectus
incorporates). Such requests should be directed to:

                         Calypte Biomedical Corporation
                          5000 Hopyard Road, Suite 480
                          Pleasanton, California 94588
                              Attention: President
                           Telephone: (925) 730-7200.


                                       24


You should rely only on  information  provided in this  Prospectus.  We have not
authorized anyone else to provide you with different information.


                       WHERE YOU CAN FIND MORE INFORMATION


We have filed with the SEC a registration statement on Form S-3/A (No. 1) under
the Securities Act of 1933, as amended, with respect to the common stock offered
by this prospectus. This prospectus, filed as part of the registration
statement, does not contain all of the information set forth in the registration
statement and its exhibits and schedules. For further information regarding us
and the shares offered hereby, please refer to the registration statement. The
statements in this prospectus are qualified in their entirety by reference to
the contents of any agreement or other document incorporated in this prospectus
by reference. You may inspect a copy of the registration statement without
charge at the SEC's principal offices, and you may obtain copies of all or any
part of the registration statement from such office upon payment of the fees
prescribed by the SEC.


We are  required by the  Securities  Exchange Act of 1934,  as amended,  to file
reports,  proxy statements and other information with the SEC. These filings may
be inspected and copied (at prescribed rates) at the SEC's Public Reference Room
at Judiciary  Plaza,  450 Fifth Street,  N.W.,  Washington,  D.C. 20549. You can
request copies of these documents by writing to the SEC and paying a fee for the
copying cost. Please call the SEC at 1-800-SEC-0330  for further  information on
the Public  Reference  Room.  Our filings with the SEC are also available to the
public  on the  SEC's  web  site at  http://www.sec.gov  and at our  website  at
http://www.calypte.com.  Our reports, proxy statements and other information may
also be  inspected  at the offices of the  National  Association  of  Securities
Dealers, Inc. located at 1735 K Street, N.W., Washington, D.C. 20006.


                      DISCLOSURE OF COMMISSION POSITION ON
                 INDEMNIFICATION FOR SECURITIES ACT LIABILITIES

Section 145 of the Delaware  General  Corporation  Law permits a corporation  to
include in its charter documents,  and in agreements between the corporation and
its directors and officers,  provisions  expanding the scope of  indemnification
beyond that specifically provided by the current law.

Article   VIII  of  our   Certificate   of   Incorporation   provides   for  the
indemnification  of directors to the fullest extent  permissible  under Delaware
law.

Article VI of our Bylaws provides for the indemnification of officers, directors
and third parties  acting on behalf of the  corporation  if such person acted in
good faith and in a manner  reasonably  believed to be in and not opposed to the
best interest of the  corporation,  and, with respect to any criminal  action or
proceeding,  the  indemnified  party had no reason to believe  his  conduct  was
unlawful.

We have entered into indemnification agreements with our directors and executive
officers, in addition to indemnification  provided for in our Bylaws, and intend
to enter into  indemnification  agreements  with any new directors and executive
officers in the future.

Insofar as indemnification  for liabilities  arising under the Securities Act of
1933 (the "Act") may be permitted to directors, officers and controlling persons
of the small business issuer pursuant to the foregoing provisions, or otherwise,
the small business issuer has been advised that in the opinion of the Securities
and  Exchange  Commission  such  indemnification  is  against  public  policy as
expressed in the Act and is, therefore, unenforceable.


                                       25