ADAC LABORATORIES
S-8, 1997-08-29
X-RAY APPARATUS & TUBES & RELATED IRRADIATION APPARATUS
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<PAGE>   1
   The Registrant requests that the Registration Statement become effective
                            immediately upon filing
                      pursuant to Securities Act Rule 462.
    As filed with the Securities and Exchange Commission on August 29, 1997.
                                                     Registration No. ________
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549
                                    Form S-8
                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933
                                 ______________
                               ADAC LABORATORIES
               (EXACT NAME OF ISSUER AS SPECIFIED IN ITS CHARTER)
     CALIFORNIA                                            94-1725806
(STATE OR OTHER JURISDICTION OF           (I.R.S. EMPLOYER IDENTIFICATION NO.)
 INCORPORATION OR ORGANIZATION)
                                540 ALDER DRIVE
                          MILPITAS, CALIFORNIA  95035
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
                             1992 STOCK OPTION PLAN
                       AND STOCK OPTION AGREEMENT (1996)
                            (FULL TITLE OF THE PLAN)
                      DAVID L. LOWE, CHAIRMAN OF THE BOARD
                               ADAC LABORATORIES
                                540 ALDER DRIVE
                          MILPITAS, CALIFORNIA  95035
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
                                 (408) 321-9100
         (TELEPHONE NUMBER, INCLUDING AREA CODE, OF AGENT FOR SERVICE)

                                _______________                  
                                    COPY TO:
                            KRISTON D. QUALLS, ESQ.
                       GRAVEN PERRY BLOCK BRODY & QUALLS
                       523 WEST SIXTH STREET, SUITE 1130
                         LOS ANGELES, CALIFORNIA  90014
                                 (213) 680-9770

<TABLE>
<CAPTION>
===================================================================================================================================
                                                  CALCULATION OF REGISTRATION FEE
___________________________________________________________________________________________________________________________________

          Title of Securities       Amount to be             Proposed Maximum         Proposed Maximum          Amount of
          to be Registered          Registered(1)            Offering Price Per       Aggregate Offering        Registration Fee
                                                             Share                    Price
- -----------------------------------------------------------------------------------------------------------------------------
          <S>                       <C>                      <C>                      <C>                       <C>
          Common Stock              2,716,804 sh             $ N/A   (2)              $ N/A      (2)            $  #     (2)
                                      712,000 sh             $ 17.625(3)              $12,549,000(3)            $3,802.73(3)
                                    ------------                                      ------------               --------   
                                    3,428,804 sh                                      $12,549,000               $3,802.73
_____________________________________________________________________________________________________________________________
</TABLE>

(1) Plus, in accordance with Rule 416(a), such indeterminate number of
    shares as may become subject to options under the 1992 Stock Option
    Plan (the "Plan") as a result of the adjustment provisions therein.
(2) Such shares have been previously registered and a registration fee has
    been paid (including 2,691,804 shares under the 1992 Plan and 25,000 under
    the Stock Option Agreement (1996)).
(3) The registration fee for 712,000 shares of Common Stock issuable
    upon exercise of options under the Plan which may be granted in the
    future is estimated solely for the purpose of determining the amount
    of the registration fee, based upon the last sale price of
    Registrant's Common Stock of $17-5/8 on the NASDAQ National Market
    System on August 22, 1997.

In addition, pursuant to Rule 416(c) under the Securities Act of 1933, this
Registration Statement also covers, if applicable, an indeterminate amount of
interests to be offered or sold pursuant to the Plan.

================================================================================
<PAGE>   2

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS



Item 1.  Plan Information*.

Item 2.  Registrant Information and Employee Plan Annual Information*.

   *     Information required by Part I to be contained in the Section 10(a)
         prospectus is omitted from the Registration Statement in accordance
         with Rule 428 under the Securities Act of 1933 and the Note to Part I
         of Form S-8.





                                       2
                                       
<PAGE>   3

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents filed by Registrant with the Securities and
Exchange Commission are incorporated by reference in the Registration
Statement:

         (1)  Registrant's Report on Form 10-K for its fiscal year ended
September 29, 1996;

         (2)  Registrant's Quarterly Report on Form 10-Q for the quarter
ended December 29, 1996;

         (3)  Registrant's Quarterly Report on Form 10-Q for the quarter ended
March 30, 1997; and

         (4)  Registrant's Quarterly Report on Form 10-Q for the quarter ended
June 29, 1997.

In addition, all documents subsequently filed by Registrant pursuant to
Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934,
prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then
remaining unsold, shall be deemed to be incorporated by reference in this
Registration Statement and to be a part hereof from the date of filing of such
documents.

ITEM 4.  DESCRIPTION OF SECURITIES.

         Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

         Not applicable.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The By-Laws of the Company provide for the indemnification of
directors and officers to the fullest extent permitted by the General
Corporation Law of the State of California.

         Section 317 of the General Corporation Law of the State of California
authorizes indemnification when a person is made a party to any proceeding by
reason of the fact that such person is or was a director, officer, employee or
agent of the corporation or was so serving at the request of the corporation in
such capacity for another corporation, and if such person acted in good faith
and in a manner reasonably believed to be in, or not opposed to, the best
interest of the corporation.  With respect to any criminal proceeding, such
person must have had no reasonable cause to believe the conduct was unlawful.
If it is determined that the conduct of such person meets these standards, such
person may be indemnified for expenses incurred and amounts paid in such





                                       3
                                       
<PAGE>   4

proceedings if actually and reasonably incurred in connection therewith.

         If such a proceeding is brought by or on behalf of the corporation
(i.e., a derivative suit), such person may be indemnified against expenses
actually and reasonably believed to be in, or not opposed to, the best
interests of the corporation.  There can be no indemnification with respect to
any matter as to which such person is adjudged to be liable to the corporation
for negligence or misconduct in the performance of his or her duty; however, a
court may, even in such case, allow indemnification of such expenses as the
court deems proper.  Where such person is successful in any such proceeding, he
or she is entitled to be indemnified against expenses actually and reasonable
incurred by him or her.  In all other cases, indemnification is made by the
corporation upon determination by it that indemnification of such person is
proper because such person has met the applicable standard of conduct.

         The Company has also entered into indemnification agreements with its
directors and certain officers which contractually obligate the Company to
indemnify such persons to the fullest extent permitted under California law.

         The California General Corporation Law permits a California
corporation to include in its Articles of Incorporation a provision eliminating
or limiting the liability of directors for monetary damages arising from
breaches of their fiduciary duty.  The only limitations imposed under the
statute are that the provisions may not eliminate or limit a director's
liability (i) for acts or omissions that involve intentional misconduct or a
knowing and culpable violation of law, (ii) for acts or omissions that a
director believes to be contrary to the best interests of the corporation or
its shareholders or that involve the absence of good faith on the part of the
director, (iii) for any transaction from which a director derived an improper
personal benefit, (iv) for acts or omissions that show a reckless disregard for
the director's duty to the corporation or its shareholders in circumstances in
which the director was aware, or should have been aware, in the ordinary course
of performing a director's duties, of a risk of serious injury to the
corporation or its shareholders, (v) for acts or omissions that constitute an
unexcused pattern of inattention that amounts to an abdication of the
director's duty to the corporation or its shareholders, or (vi) for the payment
of unlawful dividends, stock purchases or redemptions.  The Company's Articles
of Incorporation contain a provision eliminating the liability of the Company's
directors for breaches of their fiduciary duty, subject to the limitations
imposed by statute as described above.  The provisions do not limit or
otherwise affect the personal liability or a director for violation of Federal
Securities Law.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not applicable.





                                       4
<PAGE>   5

ITEM 8.  EXHIBITS.

         The following Exhibits are filed as a part of this Registration
Statement:


<TABLE>
         <S>     <C>
          4.1    ADAC Laboratories 1992 Stock Option Plan.

          4.2    Amendment No. 1 to ADAC Laboratories 1992 Stock Option Plan.

          4.3    Amendment No. 2 to ADAC Laboratories 1992 Stock Option Plan.

          4.4    Amendment No. 3 to ADAC Laboratories 1992 Stock Option Plan.

          4.5    Amendment No. 4 to ADAC Laboratories 1992 Stock Option Plan.

          4.6    Amendment No. 5 to ADAC Laboratories 1992 Stock Option Plan.

          4.7    Amendment No. 6 to ADAC Laboratories 1992 Stock Option Plan.

          4.8    ADAC Laboratories Stock Option Agreement (Not Issued Under
                 Any Stock Option Plan).

          5.1    Opinion of Graven Perry Block Brody & Qualls.

         23.1    Consent of Coopers & Lybrand L.L.P.

         23.2    Consent of Graven Perry Block Brody & Qualls (included in Opinion of Graven Perry Block Brody & Qualls filed as
                 Exhibit 5.1 herein).
</TABLE>

ITEM 9.  UNDERTAKINGS.

         (A)     The undersigned Registrant hereby undertakes:

                 (1)      To file, during any period in which offers or sales
are being made, a post-effective amendment to this Registration Statement:

                     (i)  To include any prospectus required by Section
10(a)(3) of the Securities Act of 1933;

                    (ii)  To reflect in the prospectus any facts or
events arising after the effective date of this Registration Statement (or the
most recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in this
Registration Statement;

                    (iii) To include any material information with respect to
the plan of distribution not previously disclosed in this Registration
Statement or any material change to such information in this Registration
Statement:





                                       5
<PAGE>   6


Provided however, that paragraphs (A)(1)(i) and (A)(1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed by Registrant pursuant to
Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in this Registration Statement.

                 (2)      That, for the purpose of determining any liability
under the Securities Act of 1933, each such post-effective amendment shall be
deemed to be a new Registration Statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

                 (3)      To remove from registration by means of a
post-effective amendment any of the securities being registered which remains
unsold at the termination of the offering.

         (B)     The undersigned Registrant hereby undertakes that, for
purposes of determining any liability under the Securities Act of 1933, each
filing of Registrant's annual report pursuant to Section 13(a) or Section 15(d)
of the Securities Exchange Act of 1934 (and, where applicable, each filing of
an employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in this
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (C)     (1)      The undersigned Registrant hereby undertakes to
deliver or cause to be delivered with the Prospectus to each person to whom the
Prospectus is sent or given a copy of Registrant's annual report to
shareholders for its last fiscal year, unless such employee otherwise has
received a copy of such report, in which case Registrant shall state in the
Prospectus that it will promptly furnish, without charge, a copy of such report
on written request of the employee.  If the last fiscal year of Registrant has
ended within 120 days prior to the use of the Prospectus, the annual report of
Registrant for the preceding fiscal year may be so delivered, but within such
120-day period the annual report for the last fiscal year will be furnished to
each such employee.

                 (2)      The undersigned Registrant hereby undertakes to
transmit or cause to be transmitted to all employees participating in the Plan
who do not otherwise receive such material as shareholders of Registrant, at
the time and in the manner such material is sent to its shareholders, copies of
all reports, proxy statements and other communications distributed to its
shareholders generally.

         (D)     Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of Registrant pursuant to the foregoing





                                       6
                                       
<PAGE>   7

provisions, or otherwise, Registrant 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.  In the event
that a claim for indemnification against such liabilities (other than the
payment by Registrant of expenses incurred or paid by a director, officer or
controlling person of Registrant in the successful defense of any action, suit
or proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, Registrant will, unless in the
opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.





                                       7
                                       
<PAGE>   8

                                   SIGNATURES


         THE REGISTRANT.  Pursuant to the requirements of the Securities Act of
1933, the Registrant, ADAC Laboratories, certifies that it has reasonable
grounds to believe that it meets all of the requirements for filing on Form S-8
and has duly caused this Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Milpitas, State of
California, on the 15th day of August, 1997.

                                                   ADAC LABORATORIES




                                                   By  /s/ David L. Lowe
                                                     ------------------------  
                                                       David L. Lowe,
                                                       Chairman of the Board and
                                                       Chief Executive Officer





                                       8
<PAGE>   9

                               POWER OF ATTORNEY


         The officers and directors of ADAC Laboratories, whose signatures
appear below, hereby constitute and appoint David L. Lowe and P.  Andre Simone,
and each of them, their true and lawful attorneys and agents, with full power
of substitution, each with power to act alone, to sign and execute on behalf of
the undersigned any amendment or amendments to this Registration Statement on
Form S-8, and each of the undersigned does hereby ratify and confirm all that
said attorney and agent, or his or their substitutes, shall do or cause to be
done by virtue hereof.
  ___________________________________________________________________________

         Pursuant to the requirement of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
                           Signature                                        Title                             Date       
                 -----------------------------        -----------------------------------------------    --------------
                 <S>                                  <C>                                                <C>
                 

                 /s/  David L. Lowe                   Chairman of the Board, Chief Executive Officer     August 15, 1997
                 -----------------------------        and Director (Principal Executive Officer)
                 David L. Lowe

                    
                 /s/  P. Andre Simone                 Vice President, Chief Financial Officer            August 15, 1997
                 -----------------------------        and Treasurer (Principal Financial and 
                 P. Andre Simone                      Accounting Officer)


                 /s/  Stanley D. Czerwinski           Director                                           August 15, 1997
                 -----------------------------
                 Stanley D. Czerwinski

                 
                 /s/ R. Andrew Eckert                 President, Chief Operating Officer and             August 15, 1997
                 -----------------------------        Director
                 R. Andrew Eckert


                 /s/  Graham O. King                  Director                                           August 15, 1997
                 -----------------------------                                                                            
                 Graham O. King



                 /s/ F. David Rollo                   Director                                           August 15, 1997
                 -----------------------------                                                                         
                 F. David Rollo


                 /s/ Edmund H. Shea, Jr.              Director                                           August 15, 1997
                 -------------------------                                                                             
                 Edmund H. Shea, Jr.
</TABLE>





                                       9
                                       

<PAGE>   10




<TABLE>
<CAPTION>

                            EXHIBIT INDEX


                                                                 Sequentially
Exhibit                                                            Numbered
Number                        Description                            Page 
- ------                        -----------                        -----------
<S>       <C>                                                    <C>

 4.1      ADAC Laboratories 1992 Stock Option Plan

 4.2      Amendment No. 1 to ADAC Laboratories 1992 Stock Option Plan

 4.3      Amendment No. 2 to ADAC Laboratories 1992 Stock Option Plan

 4.4      Amendment No. 3 to ADAC Laboratories 1992 Stock Option Plan

 4.5      Amendment No. 4 to ADAC Laboratories 1992 Stock Option Plan 

 4.6      Amendment No. 5 to ADAC Laboratories 1992 Stock Option Plan

 4.7      Amendment No. 6 to ADAC Laboratories 1992 Stock Option Plan

 4.8      ADAC Laboratories Stock Option Agreement (Not Issed Under
          Any Stock Option Plan)

 5.1      Opinion of Graven Perry Block Brody & Qualls

23.1      Consent of Coopers & Lybrand L.L.P.

23.2      Consent of Graven Perry Block Brody & Qualls (included in 
          Opinion of Graven Perry Block Brody & Qualls filed as
          Exhibit 5.1 herein)

</TABLE>

<PAGE>   1

                                  EXHIBIT 4.1

                               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.

<PAGE>   2

ADAC Laboratories
1992 Stock Option Plan



                 (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 unpurchased 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)





                                       2
<PAGE>   3

ADAC Laboratories
1992 Stock Option Plan



                 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 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 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





                                       3
<PAGE>   4

ADAC Laboratories
1992 Stock Option Plan



                 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 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, 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





                                       4
<PAGE>   5

ADAC Laboratories
1992 Stock Option Plan



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.

         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 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"





                                       5
<PAGE>   6

ADAC Laboratories
1992 Stock Option Plan



(or, if not so reported, as otherwise reported by the National Association of
Securities Dealers Automated Quotation (NASDAQ) System).

                 (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





                                       6
<PAGE>   7

ADAC Laboratories
1992 Stock Option Plan



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 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.





                                       7
<PAGE>   8

ADAC Laboratories
1992 Stock Option Plan



    (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 Optionee does





                                       8
<PAGE>   9

ADAC Laboratories
1992 Stock Option Plan



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





                                       9
<PAGE>   10

ADAC Laboratories
1992 Stock Option Plan



reclassification of the Common Stock, or any other increase or 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





                                       10
<PAGE>   11

ADAC Laboratories
1992 Stock Option Plan



Agreement, a "Change in Control" shall mean any event in 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
<PAGE>   12

ADAC Laboratories
1992 Stock Option Plan



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.





                                       12
<PAGE>   13

ADAC Laboratories
1992 Stock Option Plan



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

<PAGE>   1

                                  EXHIBIT 4.2

                               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

<PAGE>   1

                                  EXHIBIT 4.3

                                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

<PAGE>   1

                                  EXHIBIT 4.4

                                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

<PAGE>   1

                                  EXHIBIT 4.5

                                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


<PAGE>   1

                                  EXHIBIT 4.6

                                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 date on which it is
         granted, as determined by the Board of Directors or the Committee."
         
<PAGE>   2

Amendment No. 5 to ADAC Laboratories
1992 Stock Option Plan




                 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, 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





                                       2
<PAGE>   3

Amendment No. 5 to ADAC Laboratories
1992 Stock Option Plan





         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

<PAGE>   1
                                  EXHIBIT 4.7

                                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 any 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

<PAGE>   1

                                  EXHIBIT 4.8

                               ADAC LABORATORIES
                             STOCK OPTION AGREEMENT
                    (NOT ISSUED UNDER ANY STOCK OPTION PLAN)



         THIS STOCK OPTION AGREEMENT is issued to ROBERT L. MILLER by ADAC
LABORATORIES, a California corporation (the "Company").

         1.      OPTIONEE; BASIC TERMS.  The Optionee is hereby granted an
option to purchase the number of fully paid and non-assessable shares of the
Common Stock, without par value, of the Company at the option price hereinbelow
set forth, subject to the following additional terms and conditions:

                 A.       GRANT OF OPTION.

                 The Company hereby grants to the Optionee an option (the
"Option") to purchase 25,000 shares of the Common Stock of the Company, upon
the terms and conditions set forth below.  The date of grant of the Option is
JANUARY 4, 1996 (the "Grant Date"). This Option is intended to be a
non-qualified option, the exercise of which generally results in an immediate
taxable event under the Internal Revenue Code.

                 B.       DURATION OF OPTION.

                 This Option shall have a term of five (5) years from the Grant
Date and shall expire on JANUARY 4, 2001, unless terminated earlier as provided
herein.

                 C.       PURCHASE PRICE.

                 The purchase price for the shares subject to the Option shall
be $11.75 per share, which is equal to one-hundred percent (100%) of fair
market value, being the closing price of the Company's Common Stock on the
Grant Date, as reported in the Wall Street Journal.

         2.      EXERCISABILITY.  Subject to Section 6 regarding termination of
Optionee's employment, consulting or other relationship with the Company, as
currently applicable, and unless otherwise accelerated by action of the Board
of Directors or pursuant to Section 7(b), this Option shall become 50% vested
and exercisable on January 4, 1997 and fully vested and exercisable on January
4, 1998.


         3.  METHOD OF EXERCISE AND PAYMENT.  This Option may be exercised from
time to time, in whole or in part, to the extent exercisable, only by delivery
to an officer of the Company of the original of this Option with an appropriate
Notice of Exercise duly signed by the holder, together with the full purchase
price of the shares purchased pursuant to the exercise of the Option; provided,
however, that this Option may not be exercised if such exercise would violate
any law or governmental order or regulation.  If the


<PAGE>   2

offer and sale of the shares subject to the Option has not been
registered under the Securities Act of 1933, as amended (the "Act"), Optionee
shall deliver to the Company, at the time of exercise, an appropriate
"investment letter" in form and content satisfactory to the Company unless, in
the opinion of counsel for the Company, the shares issued would not be deemed
"restricted securities" within the meaning of such Act or the rules and
regulations promulgated thereunder. Payment for the shares purchased pursuant
to any exercise shall be made in full at the time of such exercise in cash or
by check payable to the order of the Company or in Common Stock of the Company,
having been owned by the Optionee for a period of six (6) months prior to such
exercise, valued as of the date of exercise of the Option at Fair Market Value.

Optionee agrees to have withheld from any remuneration payable to him by the
Company and/or to pay to the Company, at the time of exercise of the Option, an
amount which is required to be withheld or paid pursuant to any Federal, State
or local tax or revenue laws or regulations, as may be determined by the
Company.  The Optionee may satisfy such tax withholding by instructing the
Company to withhold such number of option shares exercised which, when valued
at Fair Market Value on the date of Exercise (being the closing price as
reported in the Wall Street Journal), equal the total tax obligations required
to be withheld.

         4.  NON-TRANSFERABILITY.  This Option shall not be transferred, sold,
pledged, assigned, hypothecated, or disposed of in any manner by Optionee other
than by will or the laws of descent and distribution to the extent hereinafter
set forth.  This Option may be exercised during the holder's lifetime only by
the holder hereof or, upon the holder's legal incapacity to act on his/her own
behalf, by the holder's conservator or other lawful representative.  The Option
shall be null and void and without effect upon any attempted assignment or
transfer, except as hereinabove provided, including without limitation, any
purported assignment, whether voluntary or by operation of law, pledge,
hypothecation or other disposition contrary to the provisions hereof, or levy
of execution, attachment, trustee process or similar process, whether legal or
equitable, upon the Option.

         5.  TERMINATION.  To the extent that this Option shall not have been
exercised in full prior to its termination or expiration date, whichever shall
be sooner, it shall terminate and become void and of no effect.

         6.  CESSATION OF CONTINUOUS STATUS -- TERMINATION, RETIREMENT, DEATH
OR DISABILITY.  If the holder shall voluntarily or involuntarily cease his/her
Continuous Status (defined herein as failure to maintain an employment or
consulting status with the Company or severance of the relationship with the
Company which gave rise to the grant of this Option) (hereinafter referred to
as a "Termination"), the Option of the holder shall terminate forthwith, except
that the holder shall have ninety days (90) days following the Termination to
exercise this Option or any portion hereof which the holder could have
exercised on the date of Termination; provided, however, that if the
Termination is due to retirement by the holder on or after attaining the age of
sixty-two (62) years, the

<PAGE>   3

Stock Option Agreement
(Not Issued Under Any Stock Option Plan)
ADAC Laboratories




disability of the holder or the death of the holder, the holder or the
representative of the estate of the holder shall have the privilege of
exercising the entire unexercised portion of this Option, provided that such
exercise be accomplished (i) prior to the expiration of this Option and (ii)
either within six (6) months of the holder's retirement, within six (6) months
of the holder's disability, or within twelve (12) months after the date of
death of the holder, as the case may be.  Notwithstanding any of the foregoing,
in the event of (i) wilful refusal to perform the normal duties and
responsibilities delegated to him as an employee of or consultant to the
Company, (ii) his expropriation of Company property (including but not limited
to trade secrets or other proprietary rights), (iii) his leaving 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 or (iv) his
violation of the provisions of Section 10 of this Option Agreement, the
existence of which shall be determined by the Board of Directors (such decision
to be made by the Board in its sole discretion and which determination shall be
conclusive), this Option shall terminate immediately upon the happening of such
event, and the holder shall have thereupon no right thereafter to exercise any
unexercised Option he might have exercised on or prior thereto.

         7.      ADJUSTMENT OF SHARES AND ACCELERATION OF EXERCISABILITY.

                 A.       STOCK SPLITS AND CAPITAL ADJUSTMENTS.  If, prior to
the complete exercise of this Option, there shall be declared and paid a stock
dividend upon the Common Stock of the Company or if such stock shall be split
up, converted, exchanged or reclassified, this Option, to the extent that it
has not been exercised, shall entitle the holder, upon the future exercise of
this Option, to such number and kind of securities or other property, subject
to the terms of the Option, to which the holder would be entitled had he
actually owned the stock subject to the unexercised portion of the Option at
the time of the occurrence of such stock dividend, split up, conversion,
exchange, reclassification or substitution; and the aggregate purchase price
upon the future exercise of the Option shall be the same as if shares of Common
Stock of the Company originally optioned were being purchased as provided
herein.

               B.       ACCELERATION OF EXERCISABILITY UPON "CHANGE IN CONTROL."

                          (i)  Ten (10) days prior to a "Change in Control" (as
         defined below), this Option, if not then presently exercisable shall
         immediately vest and become exercisable, regardless of the original
         vesting schedule in Section 2.  A "Change in Control" of the Company
         shall be deemed to have occurred if (a) any "person" or "group"





<PAGE>   4

Stock Option Agreement
(Not Issued Under Any Stock Option Plan)
ADAC Laboratories




         (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,
         sale, transfer, 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, 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.

         8.      COMPLIANCE WITH SECURITIES LAWS.

                 A.       POSTPONE ISSUANCE.       Notwithstanding any
provision of this Option to the contrary, the Company may postpone the issuance
and delivery of shares upon any exercise of this Option until one of the
following conditions shall be met:

                          (i)     The shares with respect to which such Option
         has been exercised are at the time of the issue of such shares
         effectively registered under applicable





<PAGE>   5

Stock Option Agreement
(Not Issued Under Any Stock Option Plan)
ADAC Laboratories




         Federal and state securities laws now in force or hereafter enacted or
         amended; or

                          (ii)    Counsel for the Company shall have given an
         opinion that registration of such shares under applicable Federal and
         state securities laws, as now in force or hereafter enacted or
         amended, is not required.

                 B.       INVESTMENT REPRESENTATION.        In the event that
for any reason the shares to be issued upon exercise of the Option shall not be
effectively registered under the Securities Act of 1933 (the "1933 Act"), upon
any date on which the Option is exercised in whole or in part, the Company
shall be under no further obligation to issue shares covered by the Option,
unless the Optionee shall give a written representation to the Company, in form
satisfactory to the Company, that such person is acquiring the shares issued
pursuant to such exercise of the Option for investment and not with a view to,
or for sale in connection with, the distribution of any such shares, and that
he/she will make no transfer of the same except in compliance with the 1933 Act
and the rules and regulations promulgated thereunder and then in force, and in
such event, the Company may place an "investment legend" upon any certificate
for the shares issued by reason of such exercise.

         9.      NO AGREEMENT OF EMPLOYMENT.  Neither the grant of this Option
nor this Agreement shall be deemed to create any agreement with, or obligation
by, the Company to employ the Optionee for any period of time.  By accepting
this Option, the Optionee acknowledges that his employment, if he is an
employee of the Company, is strictly "at will," and such person understands
that his employment may be terminated by the Company at any time, with or
without cause.

    10.     ASSIGNMENT OF INVENTIONS, ETC.; NON-DISCLOSURE OF CONFIDENTIAL
            INFORMATION.

                 A.       ASSIGNMENT OF INVENTIONS.  As further consideration
for the issuance of the Option, the Optionee, if he is an Employee of the
Company, agrees that any and all inventions, processes, discoveries, "know-how"
and improvements (collectively "Inventions") (regardless of whether the
Inventions are patentable), and any and all patent rights, letters patent,
copyrights, trademarks, trade name, applications therefor in the United States
and all other countries and any and all rights and interests in, to and under
the same, now possessed by the Optionee (except those, if any, listed next to
Optionee's signature on this Agreement) or acquired after the date of this
Agreement, conceived, reduced to practice, acquired, or possessed by him
(either solely or jointly with others) during the Optionee's employment by the
Company or any of its subsidiaries, relating in any way to the work or services
performed by Optionee for the Company, or made with the Company's





<PAGE>   6

Stock Option Agreement
(Not Issued Under Any Stock Option Plan)
ADAC Laboratories




assets or the business and activities of, or the equipment, devices, processes,
and formulae connected with the Company's business or any other business
conducted by the Company or any of its subsidiaries shall be assigned to, and
become the absolute property of, the Company and shall at all times and for all
purposes be regarded as acquired and held by the Optionee in a fiduciary
capacity for the sole benefit of the Company, and the Optionee agrees that,
upon request, he will promptly make all disclosures, execute all instruments
and papers, and perform all acts whatsoever necessary or desired by the Company
to vest and confirm in it, its successors, assigns and nominees, fully and
completely, all rights created or contemplated by this subparagraph A and which
may be necessary or desirable to enable the Company, its successors, assigns,
and nominees to secure and enjoy the full benefits and advantages thereof.

                 B.       NONDISCLOSURE OF CONFIDENTIAL INFORMATION.
The Optionee, regardless of whether he is an employee or consultant, shall not
at any time, directly or indirectly use, divulge, furnish or make accessible to
anyone other than the Company, its directors and officers other than in the
regular course of the business of the Company or any of its subsidiaries, any
knowledge or information with respect to (i) confidential or secret processes,
plans, formulae, data (including cost data), machinery, devices, drawings,
specifications, manufacturing procedures and techniques, methods, technology,
"knowhow," or  material relating to  the business, products (whether existing
or under development) or activities of the Company or its subsidiaries, (ii)
any confidential or secret engineering, development or research work of the
Company or its subsidiaries, (iii) any other confidential or secret aspect of
the business, products or activities of the Company or its subsidiaries, or
(iv) any customer usages and requirements or any customer lists of the Company
or its subsidiaries.

                 C.       REMEDIES.  The  Optionee  acknowledges that a breach
of him of the provisions of this Agreement will cause the Company irreparable
injury for which the Company cannot be reasonably or adequately compensated in
damages.  Such breach shall cause an immediate termination of this Option, and
the Company shall be entitled, in addition to all other remedies available to
it, to injunctive and/or other equitable relief to prevent a continuing breach
of this Agreement, or any part of it, and to secure its enforcement.

         11.  SEVERABILITY.  If any condition, term or provision of this
Agreement is determined by a court to be illegal or in conflict with any law,
state or Federal, the validity of the remaining portions or provisions shall
not be affected, and the rights and obligations of the parties shall be
construed and enforced as if this Agreement did not contain the particular
condition, term or provision determined to be unenforceable.





<PAGE>   7

Stock Option Agreement
(Not Issued Under Any Stock Option Plan)
ADAC Laboratories





         12.     ENTIRE AGREEMENT; CALIFORNIA LAW.  This Agreement contains the
entire understanding and agreement between the parties hereto respecting the
within subject matter, and there are no representations, agreements,
arrangements or understandings, oral or written, between the parties hereto
relating to the subject matter of this Agreement that are not fully expressed
herein.  The Company is a California corporation, and this Agreement shall be
governed by and construed in accordance with the laws of the State of
California.

         WITNESS the signature of its duly authorized officer of the Company as
of the date of grant hereof.

                                             ADAC LABORATORIES



                                             By_________________________________

                                             Title:  ___________________________

Acknowledged and Agreed to*:


___________________________
        Optionee

___________________________
     Street Address

___________________________
  City, State, Zip Code

___________________________
   Social Security No.



*IF you have any "Inventions" to except from Section 10, you must IDENTIFY ALL
SUCH INVENTIONS below, or, if the statement is not applicable, you must write
NONE below.

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________





<PAGE>   8

                           STOCK OPTION EXERCISE FORM

                                                             Date:______________

ADAC Laboratories
540 Alder Drive
Milpitas, California  95035

Attention:  __________________

Gentlemen:

                 The undersigned elects to exercise the option to purchase
_______ shares of common stock (the "Shares") of ADAC Laboratories (the
"Company") under and pursuant to the stock option granted to the undersigned by
the Company on _____________, 19___, under a Stock Option Agreement (the
"Agreement").

                 Prior to the issuance of said Shares, I will make full payment
of the purchase price for the Shares in cash or, if permitted under the terms
of the Agreement, by tender of stock of the Company having a fair market value
not less than the purchase price, or payment as otherwise approved by the
Company.  I also will make adequate provision for federal and state income tax
withholding obligations of the Company, if any, that arise upon exercise, in
whole or in part, of this Option.

                 In the event a portion of the purchase price for the Shares
consists of my promissory note (if permitted under the Agreement), I will
deliver to the Company the Shares as security for the full and timely payment
of such note and I agree to deposit the stock certificate or certificates
representing the Shares, along with a blank stock assignment separate from the
certificate executed by me, with an escrow agent appointed by the Company (such
agent may be an officer of the Company), to be held by such escrow agent
pursuant to a Company-approved escrow delivered herewith.

                 I represent and agree that I am over eighteen (18) years of
age, that I am acquiring the Shares for investment purposes and that I have no
present intention to transfer, sell or otherwise dispose of such Shares, except
as permitted pursuant to the Agreement and in compliance with applicable
securities laws.

                 I further acknowledge and understand that the Shares must be
held indefinitely unless they are subsequently registered under the Securities
Act or an exemption from such registration is available.  I further acknowledge
and understand that the Company is under no obligation to register the Shares
and that, in the absence of registration, the Shares may not be transferred.  I
understand that the instrument evidencing the Shares will be imprinted with
legends that prohibit the transfer of the Shares unless they are registered or
such registration is not required in the opinion of counsel satisfactory to the
Company.  I do not have any contract, agreement or arrangement with any person
to sell, transfer or grant participations, to such person or to any third
person with respect to any of the Shares.

<PAGE>   9

STOCK OPTION EXERCISE FORM




                 I agree further that said Shares are being acquired by me in
accordance with and subject to the terms, provisions and conditions of the
Agreement, to all of which I hereby expressly assent.  These agreements shall
bind and inure to the benefit of my heirs, legal representatives, successors
and assigns.

                 I agree that I will notify the Secretary of the Company if I
sell any of the Shares purchased pursuant to this Option within one (1) year
from the date I exercise all or part of this Option or within two (2) years
from the date I was granted this Option.  I further agree to hold all Shares
purchased under this Option in my name (and not under the name of any nominee)
for the one-year period immediately after exercise of this Option and the
two-year period immediately after grant of this Option.

                 My address of record is:            

                 ____________________________________

                 ____________________________________

                 and my Social Security Number is: ____________________

                                  Very truly yours,


Date:  ___________________        ________________________________


Receipt of the above is
hereby acknowledged:

ADAC LABORATORIES

By________________________

Title_____________________

Dated____________________






<PAGE>   1



                                  EXHIBIT 5.1





                                August 15, 1997
                                                                       A-176-4.1

ADAC Laboratories
540 Alder Drive
Milpitas, California  95035

Gentlemen:

        We are acting as counsel for ADAC Laboratories (the "Company") in
connection with the preparation and filing of the Company's Registration
Statement on Form S-8 pursuant to the Securities Act of 1933, as amended (the
"Act"), for the registration under the Act of 3,428,804 shares (including
2,716,804 shares which have been previously subject to a registration statement)
of the Company's Common Stock, without par value (the "Shares"), which may be
issued pursuant to the exercise of options granted under the Company's 1992
Stock Option Plan.

        We are familiar with the proceedings taken by the Company relating to
the authorization and issuance of the Shares in the manner set forth in the
Registration Statement.  We have examined and relied upon the originals, or
copies, of such corporate records, certificates, documents and other
instruments, and reviewed such questions of law as we have considered necessary
and appropriate in order to enable us to render the opinion expressed below, and
on the basis of such, we hereby advise you as follows:

          Subject to the taking of certain proceedings, to the extent required,
  in certain states which may have jurisdiction with respect thereto, the
  Shares, when issued and sold in the manner set forth in the Registration
  Statement and in the manner provided in the 1992 Stock Option Plan pursuant to
  which such issuance and sale will be undertaken, will be legally and validly
  issued and outstanding, fully paid and non-assessable.

        We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement.

                                           Very truly yours,

                                           GRAVEN PERRY BLOCK BRODY & QUALLS
                                             A PROFESSIONAL CORPORATION



                                           By /s/ Kriston D. Qualls             
                                              ---------------------------------
                                               Kriston D. Qualls






<PAGE>   1
                                                                   EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in the registration statement of
ADAC Laboratories on Form S-8 pertaining to the 1992 Stock Option Plan and Stock
Option Agreement of our reports dated November 4, 1996 on our audits of the
consolidated financial statements and financial statement schedule of ADAC
Laboratories as of and for each of the three fiscal years in the period ended
September 29, 1996, appearing in the Annual Report on Form 10-K of ADAC
Laboratories for the fiscal year ended September 29, 1996, filed with the
Securities and Exchange Commission pursuant to the Securities Act of 1934.


                                                       COOPERS & LYBRAND L.L.P.

San Jose, California
April 15, 1997


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