EXHIBIT 10.3

                               ADAC LABORATORIES
                               -----------------
                            1992 STOCK OPTION PLAN
                            ----------------------


     1.   PURPOSES OF PLAN.  The purposes of this 1992 Stock Option Plan of ADAC
          ----------------                                                      
Laboratories (the "Plan") are to attract and retain the best available personnel
for positions of substantial responsibility, and to provide additional
incentives to key employees, officers, consultants and other persons whose
efforts are deemed worthy of encouragement in order to promote the growth and
success of the Company's business.

     2.   DEFINITIONS.  As used herein, the following definitions shall apply:
          -----------                                                         

          (a)  "BOARD" shall mean the Board of Directors of the Company.

          (b)  "CODE" shall mean the Internal Revenue Code of 1986, as amended.

          (c)  "COMMON STOCK" shall mean the Common Stock of the Company.

          (d)  "COMPANY" shall mean ADAC Laboratories, a California corporation.

          (e)  "COMMITTEE" shall mean the Committee appointed by the Board of
Directors in accordance with Section 4(a) below, if one has been appointed.

          (f)  "CONSULTANT" shall mean any person who is engaged by the Company
or any Parent or Subsidiary of the Company to render consulting services.

          (g)  "CONTINUOUS STATUS AS AN EMPLOYEE OR CONSULTANT" shall mean the
absence of any interruption or termination of services as an Employee or
Consultant.  Continuous Status as an Employee or Consultant shall not be
considered interrupted in the case of sick leave, military leave, or any other
leave of absence approved by the Board, provided that either such leave is for a
period of not more than ninety (90) days or reemployment upon the expiration of
such leave is guaranteed by contract or statute.

          (h)  "EMPLOYEE" shall mean any person, including an officer or
director, employed by the Company or any Parent or Subsidiary of the Company.
The payment of a director's fee by the Company shall not be sufficient to
constitute "employment" by the Company.

          (i)  "OFFICER" shall mean any person, including a director, employed
by the Company or any Parent or Subsidiary of the Company who has been elected
an officer of the Company by the Board of Directors and who is required to file
periodic reports 

 
under Section 16(a) of the Securities Exchange Act of 1934.

          (j)  "OPTION" or "OPTIONS" shall mean one or more stock options issued
pursuant to the Plan.  Options may be either "Incentive Options," which are
defined as Options intended to meet the requirements of Section 422A of the Code
and any regulations promulgated thereunder, or "Nonqualified Options," which are
defined as Options not intended  to meet such requirements.

          (k)  "OPTIONED STOCK" shall mean the Common Stock subject to an
Option.

          (l)  "OPTIONEE" shall mean a person who receives an Option.

          (m)  "PARENT" shall mean a "parent corporation", whether now or
hereafter existing, as defined in Section 425(e) of the Code.

          (n)  "PLAN" shall mean this 1992 Stock Option Plan.

          (o)  "SHARE" shall mean a share of Common Stock, as may be adjusted in
accordance with Section 11 below.

          (p)  "SUBSIDIARY" shall mean a "subsidiary corporation", whether now
or hereafter existing, as defined in Section 425(f) of the Code.

     3.   STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 11
          -------------------------                                          
below, the maximum aggregate number of shares that may be optioned and sold
under the Plan is three million (3,000,000) shares of Common Stock.  If an
Option should expire or become unexercisable for any reason without having been
exercised in full, then the unpur chased shares that were subject to the Option
shall, unless the Plan has been terminated, become available for future grant
under the Plan.

     4.   ADMINISTRATION OF THE PLAN.
          -------------------------- 

          (A)  APPOINTMENT OF COMMITTEE.
               ------------------------ 

               (i)  Before any Option under the Plan is granted to an Officer or
          Director of the Company, the Board shall appoint a Committee,
          comprised of not less than two (2) members of the Board, each of whom
          shall be a "disinterested person", as that term is defined from time
          to time in Rule 16b-3(c)(2)(i) promulgated under the Securities
          Exchange Act of 1934, as amended. The Committee may be an existing
          committee of the Board or

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          a new committee organized for the purpose of administering the Plan.
          Options granted to any person who is both an employee and a Director
          may be granted only by the Committee.

               (ii)  An Option to an Officer may be granted by the Board if each
          member thereof is then a "disinterested person" (as hereinabove
          defined).  Otherwise, an Option to an Officer may be granted only by
          the Committee.

               (iii) A Option to a person who is neither an Officer nor a
          Director may be granted by either the Board or the Committee.

               (iv)  Subject to the foregoing, the Board may, from time to time,
          increase the size of the Committee and appoint additional members
          thereof, remove members (with or without cause) and appoint new
          members in substitution therefor, fill vacancies however caused or
          remove all members of the Committee.  All actions of the Board or the
          Committee, if taken in accordance with the Company's Bylaws, shall be
          valid notwithstanding the fact that one or more of the members thereof
          do not constitute "disinterested persons", as hereinabove defined.

          (B)  POWERS OF THE BOARD.  Subject to the provisions of the Plan, the
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Board and the Committee shall have the authority, in its discretion:

               (i)   to determine, upon review of relevant information, the fair
          market value of the Common Stock;

               (ii)  to determine the persons to whom Options shall be granted,
          the time or times at which Options shall be granted, the number of
          Shares to be represented by each Option and the exercise price per
          Share;

               (iii) to interpret the Plan;

               (iv)  to prescribe, adopt, amend, and rescind rules and
          regulations relating to the Plan;

               (v)   to determine whether an Option granted shall be an
          Incentive Option or a Nonqualified Option and to determine the terms
          and provisions of each Option granted (which need not be identical)
          and, with the consent of the holder thereof, to modify or amend each
        

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          Option;

               (vi)   to determine the exercise date(s) and the number of shares
          exercisable at each such date, and to accelerate or defer (with the
          consent of the Optionee) the exercise date of any Option;

               (vii)  to authorize any person to execute on behalf of the
          Company any instrument required to effectuate the grant of an Option
          previously approved by the Board or the Committee;

               (viii) to reduce the exercise price of outstanding Options if the
          fair market value of the shares subject to any such Option is more
          than twenty percent (20%) below the existing exercise price of such
          Option and, in connection therewith, to maintain or modify the
          existing, or commence a new, vesting schedule and, if required in
          connection therewith, to reclassify Incentive Options to Nonqualified
          Options;

               (ix)   to make such adjustments to Options granted under the Plan
          to enable them to comply with the laws of foreign jurisdictions and/or
          to make them consistent with options customarily utilized by companies
          in foreign jurisdictions; and

               (x)    to make all other determinations deemed necessary or
          advisable for the administration of the Plan.

          (C)  EFFECT OF DECISIONS.  All decisions, determinations, and
               -------------------                                     
interpretations of the Board or the Committee shall be final and binding on all
Optionees and any other holders of any Options granted under the Plan.

     5.   ELIGIBILITY.  Options may be granted only to Employees, Officers,
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Consultants or other persons whose efforts are deemed by the Board or the
Committee to be  worthy of encouragement in order to promote the growth and
success of the Company.  A person who has been granted an Option may, if he/she
is otherwise eligible, be granted an additional Option or Options.  Options
under the Plan may not be granted to any non-employee director.

          Neither the Plan nor any Option granted hereunder shall confer upon
any Optionee any right with respect to continuation of employment with the
Company, nor shall it interfere in any way with his/her right or the Company's
right to terminate his/her employment at any time, with or without cause.

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     6.   TERM OF PLAN.  The Plan shall continue in effect for a term of ten
          ------------                                                      
(10) years unless sooner terminated under Section 13 below.  Options may be
granted hereunder immediately.

     7.   TERM OF OPTION.  The term of any Incentive Option granted under the
          --------------                                                     
Plan shall be for a period of not to exceed ten (10) years from the date on
which it is granted, as determined by the Board of Directors or the Committee;
provided, however, that any Incentive Option granted to any person who owns
shares possessing more than ten percent (10%) of the total combined voting power
or value of all classes of stock of the Company or of a Subsidiary of the
Company shall have a term of not to exceed five (5) years.  The term of a
Nonqualified Option may be infinite or for a specific term.

     8.   EXERCISE PRICE AND CONSIDERATION.
          -------------------------------- 

          (A)  EXERCISE PRICE.  The per share exercise price for the Shares to
               --------------                                                 
be issued pursuant to the exercise of an Incentive Option shall not be less than
one hundred percent (100%) of the fair market value of the Company's Common
Stock on the date of grant as determined by the Board or the Committee;
provided, however, that any Incentive Option granted to any person who owns
shares possessing more than ten percent (10%) of the total combined voting power
or value of all classes of stock of the Company or of a Subsidiary thereof shall
have a per share exercise price of one hundred ten percent (110%) of the fair
market value of the Company's Common Stock on the date of grant as determined by
the Board or the Committee.  The per share exercise price for Shares to be
issued pursuant to the exercise of a Nonqualified Option shall not be less than
eighty-five percent (85%) of the fair market value of the Company's Common Stock
on the date of grant as determined by the Board or the Committee.

          (B)  FAIR MARKET VALUE.  The fair market value shall be determined by
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the Board or the Committee in its discretion; provided, however, that if there
is a public market for the Common Stock, the fair market value per Share shall
be, in the event the Common Stock is listed on the NASDAQ National Market System
or on a stock exchange, the closing price on such National Market System or
exchange on the date of grant of the Option, as reported in the "Wall Street
Journal", and, if not so listed, fair market value shall be the mean of the bid
and asked prices of the Common Stock on the date of the grant, as reported in
the "Wall Street Journal" (or, if not so reported, as otherwise reported by the
National Association of Securities Dealers Automated Quotation (NASDAQ) System).

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          (C)  CONSIDERATION.  The consideration to be paid for the Shares to be
               -------------                                                    
issued upon exercise of an Option, including the method of payment, shall be
determined by the Board or the Committee and may consist entirely of cash,
check, promissory note or shares of Company Common Stock (which must have been
held for at least six (6) months) having a fair market value on the date of
surrender equal to the aggregate exercise price of the Shares as to which the
Option shall be exercised, or any combination of such methods of payment, or
other consideration and method of payment for the issuance of Shares to the
extent permitted under Section 408 and 409 of the California General Corporation
Law.  In making its determination as to the type of consideration to accept, the
Board or the Committee shall consider whether such consideration may be
reasonably expected to benefit the Company.

          (D)  RE-LOAD OPTION.  Whenever an Optionee exercises an Option by
               --------------                                              
surrendering already-owned shares to pay all or a portion of the exercise price,
if the Option Agreement so provides or if permitted by the Board or the
Committee, at its discretion, at the time of such exercise, the Optionee shall
receive a new Option for the purchase of a number of Shares equal to the number
of Shares so surrendered, and such new Option shall have an exercise price of
not less than the fair market value of a Share of Common Stock on the date of
such surrender and shall vest and become exercisable as may be determined by the
Board or the Committee.

          (E)  WITHHOLDING TO PAY TAXES.  Option Agreements under the Plan may
               ------------------------                                       
contain a provision to the effect that all Federal and state taxes required to
be withheld or collected from an Optionee upon exercise of an Option may be
satisfied by either (i) delivering outstanding shares of Common Stock of the
Company previously owned for six (6) months by the Optionee or (ii) the
withholding of a sufficient number of exercised Option shares which, valued at
fair market value on the date of exercise, would be equal to the total
withholding obligation of the Optionee; provided, however, that no person who is
an "officer" of the Company, as such term is defined in Rule 3b-2 under the
Securities Exchange Act of 1934, may elect to satisfy the withholding of Federal
and state taxes upon the exercise of an Option by the withholding of Optioned
Stock unless such election is made either (i) at least six months prior to the
date that the exercise of the Option becomes a taxable event or (ii) during any
of the periods beginning on the third business day following the date on which
the Company releases publicly the operating results of a fiscal quarter or
fiscal year and ending on the twelfth (12th) business day following such date.
Such election shall be deemed made upon receipt of notice thereof by an officer
of the Company, by mail, personal delivery or by facsimile message, and shall be
operative

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for all Option exercises which occur following the election, until terminated by
a notice revoking such withholding election (such termination shall become
effective six (6) months after the date of such new notice).

     9.   EXERCISE OF OPTION.
          ------------------ 

          (A)  PROCEDURE FOR EXERCISE; RIGHTS AS A SHAREHOLDER.
               ----------------------------------------------- 

               (i)    Any Option granted hereunder shall be exercisable at such
times and under such conditions as determined by the Board or the Committee,
including performance criteria with respect to the Company and/or the Optionee,
and as otherwise permissible under the terms of the Plan.

               (ii)   An Option may not be exercised for a fraction of a Share.

               (iii)  An Option shall be deemed to be exercised when written
notice of such exercise has been given to the Company in accordance with the
terms of the Option by the person entitled to exercise the Option and full
payment for the Shares with respect to which the Option is exercised has been
received by the Company; provided, however, that the Board or the Committee may
prescribe and adopt rules and procedures allowing an Optionee to exercise an
Option and sell the Optioned Stock simultaneously (or on the same business day)
under circumstances which provide reasonable certainty that the Company will
receive the Option exercise price by the settlement date of the sale of the
Optioned Stock. Until the issuance (as evidenced by an appropriate entry on the
books of the Company or of a duly authorized transfer agent of the Company) of
the stock certificate evidencing such Shares, no right to vote or receive
dividends or any other rights as a shareholder shall exist with respect to the
Optioned Stock, notwithstanding the exercise of the Option. No adjustment shall
be made for a dividend or other right for which the record date is prior to the
date the stock certificate is issued, except as provided in Section 11 below.

               (iv)   Exercise of an Option in any manner shall result in a
decrease in the number of Shares which thereafter may be available, both for
purposes of the Plan and for exercise under the Option, by the number of Shares
as to which the Option is exercised. 

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          (B)  TERMINATION OF CONTINUOUS STATUS AS AN EMPLOYEE OR CONSULTANT.
               ------------------------------------------------------------- 

               (i) Except as set forth in Section 9(b)(ii) below, if an Employee
or Consultant ceases his/her Continuous Status as an Employee or Consultant (as
the case may be), he/she may, but only within ninety (90) days (or, with respect
to Nonqualified Options, such longer period of time as may be determined by the
Board or the Committee), after the date he/she ceases to have such Continuous
Status, exercise his/her Option to the extent that he/she was entitled to
exercise it at the date of such termination.

               (ii) Notwithstanding the provisions of Section 9(b)(i) above, if
the holder of an Option (A) is terminated due to Optionee's willful refusal to
perform the normal and/or reasonable duties and responsibilities delegated to
Optionee as an Employee of the Company, (B) is terminated due to Optionee's
expropriation of Company property (including trade secrets or other proprietary
rights), or (C) leaves the employment of the Company in order to directly (or
indirectly, as an employee or agent of another business or business entity)
compete with the Company, the Board or the Committee shall have the authority,
by notice to the holder of an Option, to immediately terminate such Option,
effective on the date of termination, and such Option shall no longer be
exercisable to any extent whatsoever.

          (C)  RETIREMENT.  Notwithstanding the provisions of Section 9(a)
               ----------                                                 
above, if an Optionee ceases Continuous Status as an Employee or Consultant as a
result of retiring as an active Employee or Consultant of the Company at age 62
or older, such ninety-day period shall be extended to one (1) year.  To the
extent that Optionee was not entitled to exercise the Option at the date of such
termination, or if Optionee does not exercise such Option within the time
specified herein, the Option shall terminate.

          (D)  DISABILITY.  Notwithstanding the provisions of Section 9(a)
               ----------                                                 
above, in the event an Employee or Consultant is unable to continue his/her
employment or consulting relationship (as the case may be) with the Company as a
result of his/her total and permanent disability (as defined in Section
105(d)(4) of the Code), he/she may, but only within a period of up to twenty-
four (24) months (or such shorter or longer period of time as is determined by
the Board or the Committee or as set forth in the Option Agreement) from the
date of termination, exercise the Option to the extent Optionee was entitled to
exercise it at the date of such termination.  To the extent that Optionee was
not entitled to exercise the Option at the date of termination, or if 

                                       8


Optionee does not exercise such Option within the time specified herein, the
Option shall terminate.
 
          (E)  DEATH OF OPTIONEE.  In the event of the death of an Optionee
               -----------------                                           
which occurs during the time in which an Option may be exercised, such Option
may be exercised at any time within two (2) years following the date of death or
such shorter period as may be set forth in the Option Agreement, by the
Optionee's estate or by a person who acquired the right to exercise the Option
by bequest or inheritance, but only to the extent of the right to exercise that
would have accrued had the Optionee continued living and remained in Continuous
Status as an Employee or Consultant for two (2) years after the date of death.

          (F)  DESIGNATION OF BENEFICIARY.  Notwithstanding anything in the Plan
               --------------------------                                       
to the contrary, any Option Agreement issued under the Plan may provide for the
designation of a beneficiary of the Optionee (which may be an individual or a
trust) who may exercise the Option after the Optionee's death and enjoy the
economic benefits thereof, subject to the consent of Optionee's spouse if
required by law.

     10.  NON-TRANSFERABILITY OF OPTIONS.
          ------------------------------ 

          Options shall not be transferable by the holder thereof otherwise than
(i) by will, (ii) pursuant to the laws of descent and distribution or (iii) if
then permitted by Rule 16b-3 promulgated under the Securities Exchange Act of
1934, as amended, pursuant to a qualified domestic relations order as defined in
the Code or Title I of the Employee Retirement Income Security Act (ERISA), or
the rules thereunder; provided, however, that an Optionee may designate a
beneficiary who, upon Optionee's death, may exercise the Option to the extent
permitted in Section 9 of the Plan.

     11.  ADJUSTMENTS.
          ----------- 

          (A)  STOCK SPLITS, DIVIDENDS AND OTHER COMBINATIONS.  Subject to any
               ----------------------------------------------                 
required action by the shareholders of the Company, the number of shares of
Common Stock covered by each outstanding Option, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options have yet been granted or which have been returned to the Plan
upon cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding Option, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or

                                       9

 
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board
or the Committee, whose determination in that respect shall be final, binding
and conclusive.  Except as expressly provided herein, no issuance by the Company
of shares of stock of any class, or securities convertible into shares of stock
of any class, shall affect, and no adjustment by reason thereof shall be made
with respect to, the number or price of shares of Common Stock subject to an
Option.

          (B)  DISSOLUTION OR LIQUIDATION.  In the event of the proposed
               --------------------------                               
dissolution or liquidation of the Company, each Option shall terminate
immediately prior to the consummation of such proposed action, unless otherwise
provided by the Board or the Committee.  The Board or the Committee may, in the
exercise of its sole discretion in such instances, declare that any Option shall
terminate as of a date fixed by the Board or the Committee and give each
Optionee the right to exercise his/her Option as to all or any part of the
Optioned Stock, including Shares as to which the Option would not otherwise be
exercisable.

          (C)  SALE OF ASSETS OR MERGER.  In the event of a proposed sale of all
               ------------------------                                         
or substantially all of the assets of the Company, or the merger of the Company
with or into another corporation, the Option shall be assumed or an equivalent
option (containing the same vesting schedule and equivalent exercise price)
shall be substituted by such successor corporation or a parent or subsidiary of
such successor corporation, unless the Board or the Committee determines, in the
exercise of its sole discretion and in lieu of such assumption or substitution,
that the Optionee shall have the right to exercise the Option as to all of the
Optioned Stock, including Shares as to which the Option would not otherwise be
exercisable.  If the Board or the Committee makes an Option fully exercisable in
lieu of assumption or substitution in the event of a merger or sale of assets,
then the Board shall notify the Optionee that the Option shall be fully
exercisable for a period of thirty (30) days from the date of such notice, and
the Option shall terminate upon the expiration of such period.

          (D)  CHANGE IN CONTROL.  Upon a Change in Control (as defined below),
               -----------------                                               
which is not approved by the vote of a majority of the directors then in office,
all Optionees shall have the right to exercise Options as to all Optioned Stock,
including Optioned Stock which would not otherwise be exercisable.  For purposes
of this Agreement, a "Change in Control" shall mean any event in 

                                       10

 
which (i) any "person" or "group" (as defined in or pursuant to Sections 13(d)
and 14(d) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act")), becomes the "beneficial owner" (as defined in Rule 13d-3 promulgated
under the Exchange Act), directly or indirectly, of securities of the Company
representing twenty-five percent (25%) or more of the voting power of the Common
Stock outstanding which votes generally for the election of directors; (ii) as a
result of market or corporate transactions or stockholder action, the
individuals who constitute the Board of Directors of the Company at the
beginning of any period of twenty-four (24) consecutive months, plus any new
directors whose election by such Board or nomination for election by the
stockholders of the Company is approved by a vote of at least two-thirds of the
directors still in office who were directors at the beginning of such period of
twenty-four (24) consecutive months, cease for any reason during such period of
twenty-four (24) consecutive months to constitute at least two-thirds of the
members of such Board; or (iii) the Company or any of its subsidiaries sells, in
one or more transactions other than in the ordinary course of business, assets
constituting all or substantially all of the assets of the Company and its
subsidiaries on a consolidated basis. Notwithstanding the above, the following
events shall not constitute a Change in Control: (1) any acquisition of
beneficial ownership pursuant to a will or the laws of descent and distribution;
(2) or any acquisition of beneficial ownership pursuant to (a) a
reclassification, however effected, of the Company's authorized Common Stock, or
(b) a corporate reorganization involving the Company or any of its subsidiaries
which does not result in a material change in the ultimate ownership by the
stockholders of the Company (through their ownership of the Company or the
successor to the Company resulting from the reorganization) of the assets of the
Company and its subsidiaries, if such reclassification or reorganization is
approved by the Company's Board of Directors, a majority of whom are
disinterested directors.

     12.  SPECIAL PROVISIONS RELATING TO INCENTIVE OPTIONS.  The Company shall
          ------------------------------------------------                    
not grant Incentive Options under the Plan to any Optionee to the extent that
the aggregate fair market value of the Common Stock covered by such Incentive
Options which are exercisable for the first time during any calendar year, when
combined with the aggregate fair market value of all stock covered by incentive
stock options granted to such Optionee after December 31, 1986 by the Company,
its Parent or a Subsidiary thereof which are exercisable for the first time
during the same calendar year, exceeds $100,000.  Incentive Options shall be
granted only to persons who, on the date of grant, are Employees of the Company
or a Parent or a Subsidiary of the Company.  Notwithstanding the above, to the
extent the fair market value of Shares subject to 

                                       11

 
Incentive Stock Options first exercisable in a calendar year is greater than
$100,000, the excess Options shall be treated as Non-qualified Options.

     13.  AMENDMENT AND TERMINATION OF THE PLAN.
          ------------------------------------- 

          (A)  AMENDMENT AND TERMINATION.  The Board or the Committee may at any
               -------------------------                                        
time suspend, amend or terminate the Plan with or without shareholder approval;
provided, however, that if the Plan has been previously approved by the
shareholders, no amendment or modification may be adopted without shareholder
approval if the amendment would (i) materially increase the benefits accruing to
participants under the Plan; (ii) materially increase the number of Shares which
may be issued under the Plan or (iii) materially modify the requirements as to
the eligibility for participation in the Plan.

          (B)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or
               ----------------------------------                        
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if the Plan had not been
amended or terminated, unless mutually agreed otherwise between the Optionee and
the Board or the Committee, which agreement must be in writing and signed by the
Optionee and the Company.

     14.  CONDITIONS UPON ISSUANCE OF SHARES.
          ---------------------------------- 

          (A)  COMPLIANCE WITH SECURITIES LAWS.  Shares shall not be issued
               -------------------------------                             
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto complies with all relevant
provisions of law, including, without limitation, the Securities Act of 1933,
the Securities Exchange Act of 1934, the rules and regulations promulgated
thereunder, and the requirements of any stock exchange upon which the Shares may
then be listed.  The exercise of such Option and the issuance and delivery of
such Shares pursuant thereto shall be further subject to the approval of counsel
for the Company with respect to such compliance.

          (B)  INVESTMENT REPRESENTATION.  As a condition to the exercise of an
               -------------------------                                       
Option, the Company may require the person exercising such Option to represent
and warrant at the time of any such exercise that the Shares are being purchased
only for investment and without any present intention to sell or distribute such
Shares if, in the opinion of counsel for the Company, such a representation is
required by any of the aforementioned relevant provisions of law.

     15.  RESERVATION OF SHARES.  The Company, during the term of
          ---------------------                                                 

                                       12

 
the Plan, will at all times reserve and keep available such number of Shares as
shall be sufficient to satisfy the requirements of the Plan. The inability of
the Company to obtain authority from any regulatory body having jurisdiction,
which authority is deemed by the Company's counsel to be necessary to the lawful
issuance and sale of any Shares hereunder, shall relieve the Company of any
liability in respect of the failure to issue or sell such Shares as to which
such requisite authority shall not have been obtained.

     16.  OPTION AGREEMENTS.  Options shall be evidenced by written Option
          -----------------                                               
Agreements in such form as the Board or the Committee shall approve.

     17.  SHAREHOLDER APPROVAL.  The Plan shall become effective when approved
          --------------------                                                
by the Board or any committee thereof having authority to do so.  The Plan may
be submitted to the shareholders for approval, but the lack of such shareholder
approval shall not affect the validity or effectiveness of any Option granted
hereunder.


                                             Adopted and Approved
                                             Effective July 8, 1992

                                        13

 
                               AMENDMENT NO. 1 TO
                               ------------------
                               ADAC LABORATORIES
                               -----------------
                             1992 STOCK OPTION PLAN
                             ----------------------



     The 1992 Stock Option Plan of ADAC Laboratories (the "Plan") is hereby
amended, effective immediately, as follows:

     1.   Section 4(b)(viii), providing for the reduction of the exercise price
of outstanding options under certain circumstances, is hereby deleted.

     2.   The last full sentence of Section 8(a) of the Plan, providing for the
determination of the exercise price of stock options granted, is hereby amended
to read in full as follows:

          "The per share exercise price for Shares to be issued
          pursuant to the exercise of a Nonqualified Option shall
          not be less than one hundred percent (100%) of the fair
          market value of the Company's Common Stock on the date
          of grant as determined by the Board or the Committee."

     3.   In all other respects the Plan is hereby ratified and confirmed.

     4.   The amendments to the Plan herein set forth have been approved and are
effective as of the fifteenth (15th) day of March, 1993.

                              By order of the Board of Directors:



                              By     /s/ Stanley D. Czerwinski
                                 ---------------------------------
                              Stanley D. Czerwinski,
                              Chairman of the Board

 
                                AMENDMENT NO. 2
                                ---------------
                                       TO
                                       --
                               ADAC LABORATORIES
                               -----------------
                             1992 STOCK OPTION PLAN
                             ----------------------



     The 1992 Stock Option Plan of ADAC Laboratories (the "Plan") is hereby
amended, effective immediately, as follows:

     1.   Section 3, providing for the number of shares subject to the Plan, is
hereby amended to provide that the maximum aggregate number of shares that may
be optioned and sold under the Plan is 1,666,000 shares of Common Stock (such
number reflects the prior 1-for-3 reverse stock split).

     2.   In all other respects the Plan is hereby ratified and confirmed.

     3.   The amendments to the Plan herein set forth have been approved by the
Board of Directors on November 3, 1993 and approved by the shareholders on March
2, 1994, and are effective as of such later date.

                                 By order of the Board of Directors:



                                 By  /s/ Stanley D. Czerwinski
                                    --------------------------------
                                 Stanley D. Czerwinski,
                                 Chairman of the Board

 
                                AMENDMENT NO. 3
                                ---------------
                                       TO
                                       --
                               ADAC LABORATORIES
                               -----------------
                             1992 STOCK OPTION PLAN
                             ----------------------


     The 1992 Stock Option Plan of ADAC Laboratories (the "Plan") is hereby
amended, effective immediately, as follows:

     1.   Section 3, providing for the number of shares subject to the Plan, is
hereby amended to provide that the maximum aggregate number of shares that may
be optioned and sold under the Plan is 2,446,000 shares of Common Stock

     2.   Section 5, entitled "Eligibility," is hereby amended to change the
title to "Eligibility; Maximum  Annual Limitation" and to add a new last
sentence to the first paragraph as follows:

               "The aggregate number of shares of Common Stock with respect to
     which Options may be granted to any one Optionee shall not exceed 300,000
     shares in any calendar year, subject to adjustment in accordance with
     Section 11."

     3.   The first sentence of Section 4(a)(i), entitled "Administration of the
Plan -- (a) Appointment of Committee," is hereby amended as follows:

               "(i) Before any Option under the Plan is granted to an Officer or
     Director of the Company, the Board shall appoint a Committee, comprised of
     at least two (2) members of the Board, each of whom shall be
     "disinterested," as that term is defined from time to time in Rule 16b-3
     promulgated under the Securities Exchange Act of 1934, and, in addition, as
     may be further defined under Section 162 (m) of the Internal Revenue Code
     of 1986."

     4.   In all other respects the Plan is hereby ratified and confirmed.

     5.   The amendments to the Plan herein set forth have been approved by the
Board of Directors on November 2, 1994 and approved by the shareholders on March
1, 1995, and are effective as of such later date.

                              By order of the Board of Directors:


                              By /s/ Stanley D. Czerwinski
                                 ---------------------------------
                              Stanley D. Czerwinski,
                              Chairman of the Board

 
                                AMENDMENT NO. 4
                                ---------------
                                      TO
                                      --
                               ADAC LABORATORIES
                               -----------------
                            1992 STOCK OPTION PLAN
                            ----------------------



          The 1992 Stock Option Plan (the "Plan") of ADAC Laboratories, a
California corporation (the "Company"), is hereby amended as follows:

          1.   Section 10, entitled "Non-Transferability of Options," is hereby
amended as follows:

               Options shall not be transferable by the holder
     thereof otherwise than (i) by will, (ii) pursuant to the
     laws of descent and distribution, or (iii) pursuant to a
     division of property resulting from a dissolution of
     marriage, whether pursuant to a qualified domestic
     relationship order, stipulation between the option holder
     and spouse or otherwise; provided, however, that an Optionee
     may designate a beneficiary who, upon Optionee's death, may
     exercise the Option to the extent permitted in Section 9 of
     the Plan.

          2.   Except as amended above, in all other respects the Plan is hereby
ratified and confirmed.  The above amendment shall be deemed effective and
applicable to all future grants of options and all presently outstanding option
grants under the terms of the Plan.

          3.   The amendment to the Plan herein set forth have been approved by
the Board of Directors on June 11, 1995 and is effective as of such date.

                              By order of the Board of Directors:


                              By: /s/ David L. Lowe
                                  ---------------------------------
                                  David L. Lowe,
                                    Chief Executive Officer

 
                                AMENDMENT NO. 5
                                ---------------
                                       TO
                                       --
                               ADAC LABORATORIES
                               -----------------
                             1992 STOCK OPTION PLAN
                             ----------------------



          The 1992 Stock Option Plan (the "Plan") of ADAC Laboratories, a
California corporation (the "Company"), is hereby amended in the following
respects:

          1.   Section 3, entitled "Stock Subject to the Plan," is hereby
amended to delete the first sentence and to add a new first sentence as follows:

               "Subject to the provisions of Section 11 and Section 4(b)(xi)
     below, the maximum aggregate number of shares that may be optioned and sold
     under the Plan is 3,801,000 shares of Common Stock."

This amendment reflects an increase in the number of authorized shares by
1,355,000 shares.

          2.   Section 4(b), entitled "Administration of the Plan Powers of the
Board," is hereby amended to add a new subparagraph (xi) as follows:

               "(xi)  Notwithstanding the number of shares set forth in Section
     3, the maximum aggregate number of shares subject to the Plan may be
     automatically increased by the Board, at its discretion and without
     shareholder approval, if the Board determines in connection with an
     acquisition of another business (whether by merger, consolidation or
     purchase of assets or otherwise) that it is necessary to grant a
     substantial number of new options to employees of, or persons holding
     options in, such acquired business to replace existing options, to grant
     new options to incentivize the employees or replace other equity rights
     previously granted to such persons by the acquired business. The amount of
     the additional number of shares to become subject to the Plan shall not
     exceed the number of new options granted in connection with such
     acquisition."

          3.   Section 7, entitled "Term of Option," is hereby amended to delete
the last sentence and to replace such sentence with a new sentence as follows:

               "The term of a Non-qualified Option shall be for a period of not
     to exceed ten (10) years from the

                                       1

 
     date on which it is granted, as determined by the Board of Directors or the
     Committee."

          4.   Section 11(d), entitled "Adjustments - Change in Control," is
hereby deleted in its entirety and the following subsection 11(d) is substituted
in its place as follows:

               "(d) Change in Control.
                    ----------------- 

                    "(i) Except and to the extent provided otherwise in, or
     limited by, employment, severance or similar written agreements between the
     Company and an Optionee, ten (10) days prior to a "Change in Control" (as
     defined below), all stock options which are then not exercisable shall
     immediately vest and become exercisable, regardless of the original vesting
     schedule. A "Change in Control" of the Company shall be deemed to have
     occurred if (a) any "person" or "group" (as defined in or pursuant to
     Sections 13(d) or 14(d) of the Securities Exchange Act of 1934, as amended
     (the "Exchange Act")), becomes the "beneficial owner" (as defined in Rule
     13d-3 promulgated under the Exchange Act), directly or indirectly, of
     securities of the Company representing 40% or more of the voting power of
     the common stock outstanding which votes generally for the election of
     directors; (b) as a result of market or corporate transactions or
     shareholder action, the individuals who constitute the Board of Directors
     of the Company at the beginning of any period of 12 consecutive months (but
     commencing not earlier than July 1, 1995), plus any new directors whose
     election or nomination was approved by a vote of at least two-thirds of the
     directors still in office who were directors at the beginning of such
     period of 12 consecutive months, cease for any reason during such period of
     12 consecutive months to constitute at least two-thirds of the members of
     such Board; or (c) the Company sells, through merger, assignment or
     otherwise, in one or more transactions other than in the ordinary course of
     business, assets which provided at least 2/3 of the revenues or pre-tax net
     income of the Company and its subsidiaries on a consolidated basis during
     the most recently-completed fiscal year.

               "(ii) Notwithstanding paragraph (i) above, the following events
     shall not constitute a Change in Control: any acquisition of beneficial
     ownership pursuant to (a) a reclassification, however effected,

                                       2

 
     of the Company's authorized common stock, or (b) a corporate reorganization
     involving the Company or any of its subsidiaries which does not result in a
     material change in the ultimate ownership by the shareholders of the
     Company (through their ownership of the Company or its successor resulting
     from the reorganization) of the assets of the Company and its subsidiaries,
     but only if such reclassification or reorganization has been approved by
     the Company's Board of Directors."

          5.   Except as amended above, in all other respects the Plan is hereby
ratified and confirmed.  The above amendments shall be deemed effective and
applicable to all future grants of options and all presently outstanding option
grants under the terms of the Plan.

          6.   The amendments to the Plan herein set forth have been approved by
the Board of Directors on November 2, 1995 and approved by the shareholders on
March 6, 1996, and are effective as of such later date.

                              By order of the Board of Directors:


                              By:/s/David L. Lowe
                                 -------------------------------
                                 David L. Lowe,
                                   Chairman of the Board

                                       3

 
                                AMENDMENT NO. 6
                                ---------------
                                      TO
                                      --
                               ADAC LABORATORIES
                               -----------------
                            1992 STOCK OPTION PLAN
                            ----------------------
                             AMENDED AND RESTATED
                             --------------------



          The 1992 Stock Option Plan (the "Plan") of ADAC Laboratories, a
California corporation (the "Company"), is hereby amended in the following
respects:

          1.   STOCK SUBJECT TO THE PLAN.  Section 3, entitled "Stock Subject to
               -------------------------                                        
the Plan," is hereby amended to delete the first sentence and to add a new first
sentence as follows:

               "Subject to the provisions of Section 11 and Section
     4(b)(xi) below, the maximum aggregate number of shares that may be
     optioned and sold under the Plan is 4,513,000 shares of Common Stock."

This amendment reflects an increase in the number of authorized shares by
712,000 shares.

          2.   SHAREHOLDER APPROVAL.  Section 17, entitled "Shareholder
               --------------------                                    
Approval," is hereby amended and restated in its entirety as follows:

               "The Plan shall become effective when approved by the Board
     or an committee thereof having authority to do so and the shareholders
     of the Company."

          3.   EFFECTIVE DATE.  Except as amended above, in all other respects
               --------------                                                 
the Plan is hereby ratified and confirmed.  The amendments to the Plan herein
set forth have been approved by the Board of Directors on October 31, 1996 and
the amendment to Section 3 has been approved by the shareholders on May 15,
1997.  The amendment of Section 3 is effective as of October 31, 1996 and the
amendment of Section 17 is effective as of May 15, 1997.

                              By Order of the Board of Directors:


                              By: /s/Karen L. Masterson
                                  --------------------------------
                                  Karen L. Masterson
                                    Secretary