UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE TO

           TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) OR 13(e)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                          MOLECULAR DIAGNOSTICS, INC.
                       (Name of Subject Company (issuer))

                          MOLECULAR DIAGNOSTICS, INC.
    (Names of Filing Persons (identifying status as offeror, issuer or other
                                    person))

                         COMMON STOCK, PAR VALUE $0.001
                         (Title of Class of Securities)

                                   60851R104
                     (CUSIP Number of Class of Securities)

                               LEONARD R. PRANGE
                                   PRESIDENT
                          MOLECULAR DIAGNOSTICS, INC.
                      414 NORTH ORLEANS STREET, SUITE 510
                            CHICAGO, ILLINOIS 60610
                (Name, address, and telephone numbers of person
 authorized to receive notices and communications on behalf of filing persons)

                                    COPY TO
                             ROBERT J. MINKUS, ESQ.
                             SCHIFF HARDIN & WAITE
                                6600 SEARS TOWER
                            CHICAGO, ILLINOIS 60606
                                 (312) 258-5500

                           CALCULATION OF FILING FEE

<Table>
<Caption>
- ---------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------
            TRANSACTION VALUATION*                         AMOUNT OF FILING FEE**
- ---------------------------------------------------------------------------------------------
                                            
                 $17,270,000                                       $3,454
- ---------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------
</Table>

 * Calculated solely for purposes of determining the filing fee. This amount
   assumes that 20,000,000 shares of common stock will be exchanged for 800,000
   shares of Series E convertible preferred stock, which is convertible into
   22,000,000 shares of common stock.

** The amount of filing fee calculated in accordance with Rule 0-11(b) under the
   Securities Exchange Act of 1934 equals 1/50 of one percent of the transaction
   value.

[ ] Check the box if any part of the fee is offset as provided by Rule
    0-11(a)(2) and identify the filing with which the offsetting fee was
    previously paid. Identify the previous filing by registration statement
    number, or the Form or Schedule and the date of its filing.

<Table>
                                                  
    Amount Previously Paid: -------------------      Filing Party: ---------------------
    Form or Registration No.: -----------------      Date Filed: -----------------------
</Table>

[ ] Check the box if the filing relates solely to preliminary communications
    made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the
statement relates:

[ ] third-party tender offer subject to Rule 14d-1.

[X] issuer tender offer subject to Rule 13e-4.

[ ] going-private transaction subject to Rule 13e-3.

[ ] amendment to Schedule 13D under Rule 13d-2

Check the following box if the filing is a final amendment reporting the results
of the tender offer:  [ ]


     This Schedule TO relates to the offer by Molecular Diagnostics, Inc., a
Delaware corporation ("Molecular Diagnostics") to exchange (the "Exchange
Offer") 1/25 (one twenty-fifth) of a share of Series E convertible preferred
stock, par value $0.001, of Molecular Diagnostics for each share of common
stock, par value $0.001, of Molecular Diagnostics currently outstanding
commencing on November 20, 2001 and ending December 19, 2001 (the "Expiration
Date"). Subject to the terms and conditions of the Exchange Offer, Molecular
Diagnostics will issue 800,000 shares of Series E convertible preferred stock
for up to 20,000,000 shares of common stock, representing approximately 56% of
the outstanding common stock as of November 16, 2001. We will accept no more
than 20,000,000 shares of common stock for exchange pursuant to the Exchange
Offer. Holders of common stock electing to tender their shares prior to the
Expiration Date may withdraw such acceptance, so long as a notice of such
withdrawal is received by Molecular Diagnostics on or prior to the Expiration
Date. The Series E convertible preferred stock will be delivered as soon as
practicable after the Expiration Date. If more than 20,000,000 shares of common
stock are tendered, Molecular Diagnostics will accept from each tendering holder
of common stock an amount based on the proportion of common stock tendered by
that holder to all common stock tendered. Molecular Diagnostics reserves the
right to extend or terminate the Exchange Offer, in its sole and absolute
discretion, which may be for any or no reason, and to otherwise amend the
Exchange Offer in any respect. The Exchange Offer is open to all holders of
common stock, and is subject to customary conditions. The Exchange Offer is
subject to the terms and conditions set forth in the Offering Circular, dated
November 19, 2001 (the "Offering Circular"), and in the related letter of
transmittal (which, as either may be amended or supplemented from time to time,
together constitute the "Disclosure Documents"). Subject to applicable
securities laws and the terms set forth in the Offering Circular, Molecular
Diagnostics reserves the right to waive any all conditions to the Exchange
Offer. The Offering Circular and the letter of transmittal are attached to this
Schedule TO as Exhibits (a)(1) and (a)(2), respectively. All information in the
Disclosure Documents, including all schedules and annexes, is hereby expressly
incorporated by reference in answer to all items in this Schedule TO, except as
otherwise set forth below.

ITEM 1.  SUMMARY TERM SHEET.

     The information set forth in the Offering Circular under the title "Summary
Term Sheet" is incorporated herein by reference.

ITEM 2.  SUBJECT COMPANY INFORMATION.

(a)  Molecular Diagnostics, Inc., a Delaware corporation, is the issuer of the
     Series E convertible preferred stock that is subject to the Exchange Offer.
     Molecular Diagnostics' principal executive office is located at 414 North
     Orleans Street, Suite 510, Chicago, Illinois 60610, and its telephone
     number is (312) 222-9550. Prior to September 25, 2001, Molecular
     Diagnostics' corporate name was Ampersand Medical Corporation.

(b)  The subject class of equity securities is Molecular Diagnostics' common
     stock, par value $0.001. As of November 16, 2001, Molecular Diagnostics had
     35,560,517 shares of common stock issued and outstanding.

(c)  Molecular Diagnostics' common stock is quoted on the Over-the-Counter
     Bulletin Board under the symbol MCDG. Before September 26, 2001, the common
     stock was quoted under the symbol AMPM and before June 1, 1999 it was
     quoted under the symbol BLBN.

                                        1


     The table below sets forth the reported high and low sales price of
     Molecular Diagnostics' common stock as reported for the periods shown. The
     prices do not include retail mark-ups, mark-downs or commissions. Molecular
     Diagnostics did not pay any dividends on the common stock during these
     periods.

<Table>
<Caption>
                                                              HIGH     LOW
                                                              -----   -----
                                                                
1999 CALENDAR YEAR
  Third Quarter.............................................  $0.63   $0.25
  Fourth Quarter............................................   0.81    0.25
2000 CALENDAR YEAR
  First Quarter.............................................   5.56    1.00
  Second Quarter............................................   4.13    2.38
  Third Quarter.............................................   3.50    1.94
  Fourth Quarter............................................   2.88    0.75
2001 CALENDAR YEAR
  First Quarter.............................................   2.06    0.81
  Second Quarter............................................   2.06    0.97
  Third Quarter.............................................   1.20    0.36
  Fourth Quarter (through November 15, 2001)................   1.25    0.76
</Table>

ITEM 3.  IDENTITY AND BACKGROUND OF FILING PERSON.

(a)  Molecular Diagnostics is the filing person and subject company. The
     business address and telephone number are set forth under Item 2(a) of this
     Schedule TO.

     Pursuant to General Instruction C to Schedule TO, the following persons are
     the directors and/or executive officers of Molecular Diagnostics:

<Table>
                            
Peter P. Gombrich              Chairman of the Board and Chief Executive Officer
Alexander M. Milley            Director
Denis M. O'Donnell, M.D.       Director
John H. Abeles, M.D.           Director
Robert C. Shaw                 Director
Leonard R. Prange              President, Chief Operating Officer and Chief Financial Officer
</Table>

     The business address and telephone number for all of Molecular Diagnostics'
     directors and executive officers is c/o Molecular Diagnostics, Inc., 414
     North Orleans Street, Suite 510, Chicago, Illinois 60610, and (312)
     222-9550.

     There is neither any person controlling Molecular Diagnostics nor any
     executive officer or director of any corporation or other person ultimately
     in control of Molecular Diagnostics.

ITEM 4.  TERMS OF THE TRANSACTION.

(a)  The information set forth in the sections of the Offering Circular entitled
     "The Exchange Offer," "Federal Income Tax Considerations," "Description of
     Series E Convertible Preferred Stock" and "Description of Capital Stock"
     are incorporated herein by reference.

(b)  The Exchange Offer is open to all holders of Molecular Diagnostics' common
     stock, including officers and directors of Molecular Diagnostics. If the
     officers and directors of Molecular Diagnostics participate in the Exchange
     Offer, Molecular Diagnostics will exchange their shares of common stock on
     the same terms and conditions as all other holders of common stock who
     tender their shares. The directors and executive officers named in Item 3
     of this Schedule TO have notified Molecular Diagnostics that they intend to
     tender for exchange all of their shares of common stock, totaling 9,586,382
     shares. No affiliate has notified Molecular Diagnostics that he, she or it
     intends to participate in the Exchange Offer.

                                        2


ITEM 5.  PAST CONTACTS, TRANSACTIONS, NEGOTIATIONS AND AGREEMENTS.

(e)  Denis M. O'Donnell, M.D., a director of Molecular Diagnostics, has agreed
     not to exercise warrants entitling him to purchase 784,901 shares of common
     stock of Molecular Diagnostics at an exercise price of $0.01, until the
     earlier of the effective date of a one-for-three reverse stock split of
     Molecular Diagnostics' common stock or an amendment to Molecular
     Diagnostics' Certificate of Incorporation to increase the authorized shares
     of common stock.

     Azimuth Corporation has agreed not to exercise warrants entitling it to
     purchase 2,875,000 shares of common stock of Molecular Diagnostics at
     exercise prices ranging from $0.001 to $1.25 per share, until the earlier
     of the effective date of a one-for-three reverse stock split of Molecular
     Diagnostics' common stock or an amendment to Molecular Diagnostics'
     Certificate of Incorporation to increase the authorized shares of common
     stock.

ITEM 6.  PURPOSES OF THE TRANSACTION AND PLANS OR PROPOSALS.

(a)  The information set forth in the section of the Offering Circular entitled
     "Summary Term Sheet" is incorporated herein by reference.

(b)  Molecular Diagnostics will hold in treasury the common stock it acquires in
     the Exchange Offer but which may be used for issuance upon the exercise or
     conversion of options, warrants and/or preferred stock.

(c)  Molecular Diagnostics has no plans, proposals or negotiations that relate
     to or would result in the matters referred to in paragraphs (c)(1) through
     (c)(10).

ITEM 7.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

(a)  Molecular Diagnostics will issue the Series E convertible preferred stock
     it is offering in exchange for the common stock out of its authorized but
     unissued shares of preferred stock.

(b)  Not applicable.

(d)  Not applicable.

ITEM 8.  INTEREST IN SECURITIES OF THE SUBJECT COMPANY.

(a)  The table below sets forth information as of November 16, 2001, with
     respect to the beneficial ownership of the common stock by each person
     named under Item 3 of this Schedule TO. Unless otherwise noted, Molecular
     Diagnostics believes that all persons named in the table below have sole
     voting and investment power with respect to all shares of Molecular
     Diagnostics' common stock listed as beneficially owned by them. For
     purposes of the table, a person is deemed to be the beneficial holder of
     securities that can be acquired by the person currently or within 60 days
     of November 16, 2001 upon the exercise of warrants or options or the
     conversion of any series of Molecular Diagnostics' preferred stock. Each
     beneficial owner's percentage ownership is determined by including the
     shares underlying options or warrants which are exercisable or preferred
     stock which is convertible by the owner currently or within 60 days
     following November 16, 2001, and excluding shares underlying options,
     warrants and convertible preferred stock held by any other person.

<Table>
<Caption>
                                                       NUMBER OF SHARES
NAME OF BENEFICIAL OWNER                              BENEFICIALLY OWNED   PERCENTAGE OF CLASS
- ------------------------                              ------------------   -------------------
                                                                     
Peter P. Gombrich(1)................................      5,726,173               16.1%
Alexander M. Milley(2)..............................      6,254,391               17.5%
Denis M. O'Donnell, M.D.............................        784,901                2.2%
John H. Abeles, M.D.(3).............................        324,116                 .9%
Robert C. Shaw(4)...................................        570,417                1.6%
Leonard R. Prange(5)................................      1,133,355                3.2%
</Table>

(b)  None.

                                        3


 (1) Includes: (i) 3,303,925 shares issued as a result of the merger of InPath,
     LLC and Bell National Corporation in December 1998; (ii) 838,434 shares
     owned by Mr. Gombrich's wife; (iii) 479,827 shares owned by The EAG Trust,
     479,827 shares owned by The CMC Trust, and 479,827 shares owned by The MDG
     Trust, for each of which Mrs. Gombrich serves as sole Trustee; and (iv)
     73,333 shares underlying options exercisable by Mr. Gombrich within sixty
     days. Mr. Gombrich disclaims beneficial ownership of the shares held by his
     wife and the Trusts for which she serves as Trustee.

 (2) Includes: (i) 503,333 shares owned by Milley Management, Inc., of which Mr.
     Milley is the sole director and executive officer, (ii) 1,494,667 shares
     owned by Cadmus Corporation, of which Mr. Milley is a director and
     executive officer, and 250,000 shares issuable to Cadmus Corporation under
     a warrant granted by Molecular Diagnostics that was exercisable on August
     7, 2001; (iii) 506,250 shares owned by Azimuth Corporation, of which Mr.
     Milley is a director and executive officer, and 2,875,000 shares issuable
     to Azimuth Corporation under warrants granted by Molecular Diagnostics that
     were exercisable on August 7, 2001; (iv) 148,655 shares owned by Winchester
     National, Inc., of which Mr. Milley is a director, and (v) 70,000 shares
     subject to options granted by Molecular Diagnostics to Mr. Milley that were
     exercisable on August 7, 2001 or which have or will become exercisable
     within 60 days thereafter.

 (3) Includes: (i) 191,616 shares owned by Northlea Partners, Ltd., of which Dr.
     Abeles is the general partner, 62,500 shares issuable to Northlea Partners,
     Ltd. under a warrant granted by Molecular Diagnostics that was exercisable
     on August 7, 2001, and (ii) 70,000 shares subject to options granted by
     Molecular Diagnostics to Dr. Abeles which were exercisable on August 7,
     2001 or have or will become exercisable within 60 days thereafter. Dr.
     Abeles disclaims beneficial ownership of all shares owned by Northlea
     Partners, Ltd. except 2,491 shares, which shares are attributable to his 1%
     interest in Northlea Partners, Ltd. as general partner.

 (4) Includes: (i) 463,333 shares received in a Claims Settlement Agreement in
     December 1998; (ii) 37,084 shares acquired in a private transaction in
     1989; and (iii) 70,000 shares underlying stock options, which are
     exercisable within sixty days.

 (5) Includes: (i) 300,000 shares received as a result of the merger of InPath,
     LLC and Bell National Corporation in December 1998; (ii) 396,688 shares
     received as the result of the conversion during 2000 of the principal and
     accrued interest related to a 6% convertible promissory note purchased in a
     private offering in May 1999; and (iii) 436,667 shares underlying options
     exercisable within sixty days.

                                        4


ITEM 9.  PERSONS/ASSETS, RETAINED, EMPLOYED, COMPENSATED OR USED.

(a)  The information set forth in the section of the Offering Circular entitled
     "The Exchange Offer -- Solicitation" is incorporated herein by reference.

ITEM 10.  FINANCIAL STATEMENTS.

(a)  The information set forth in the section of the Offering Circular entitled
     "Where You Can Find More Information About Us" and on pages F-1 - F-29 of
     Molecular Diagnostics' Annual Report on Form 10-K, as amended, for its
     fiscal year ended December 31, 2000 and on pages 3 - 13 of Molecular
     Diagnostics' Quarterly Report on Form 10-Q, as amended, for the quarter
     ended September 30, 2001 is incorporated herein by reference. Molecular
     Diagnostics' Amended Annual Report and Amended Quarterly Report can be
     inspected at the Securities and Exchange Commission's web site at
     www.sec.gov or at the SEC's public reference room at 450 Fifth Street,
     N.W., Washington, D.C. 20549 (1-800-SEC-0330) or can be requested from
     Leonard R. Prange, President of Molecular Diagnostics at the address or
     telephone number provided in Item 2(a) of this Schedule TO.

(b)  Not applicable.

ITEM 11.  ADDITIONAL INFORMATION.

(a)  None.

(b)  None.

ITEM 12.  EXHIBITS.

<Table>
     
(a)(1)  Offering Circular
   (2)  Letter of Transmittal
   (3)  Notice of Guaranteed Delivery
   (4)  Letter to Common Stockholders
   (5)  Letter to Broker-Dealers
   (6)  Letter to Clients
   (7)  Guidelines for Substitute Form W-9
   (8)  Press Release
   (b)  Not applicable
   (d)  Not applicable
   (g)  Not applicable
   (h)  Not applicable
</Table>

ITEM 13.  INFORMATION REQUIRED BY SCHEDULE 13E-3.

     None.

                                   SIGNATURE

     After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Date: November 20, 2001

                                          By:     /s/ LEONARD R. PRANGE
                                            ------------------------------------
                                            Leonard R. Prange
                                            President

                                        5