DEVELOPMENT AND DISTRIBUTION AGREEMENT

         This  DEVELOPMENT  AND  DISTRIBUTION  AGREEMENT  (this  'Agreement') is
entered into as of the 8 day of June, 1998  ('Effective  Date'),  by and between
OSTEX INTERNATIONAL,  INC., a Washington  corporation having its principal place
of business at 2203  Airport Way South,  Suite 400,  Seattle,  Washington  98134
('Ostex'),  and METRIKA,  INC., a California  corporation  having its  principal
place of business at 510 Oakmead Parkway, Sunnyvale, CA 94086 ('Metrika').

                                    RECITALS

         A.  The  Washington  Research   Foundation,   a  nonprofit   Washington
corporation  ('WRF'),  is the owner, by way of assignment from the University of
Washington,  of all right,  title, and interest in certain technology  developed
out of research  conducted  by Dr.  David Eyre and  generally  described  as the
'Urinary Assay for Bone Resorption.'

         B.  Pursuant  to that  certain  Restated  Exclusive  License  Agreement
between  Ostex and WRF,  effective  June 29,  1992 as amended,  the  ('WRF/Ostex
Exclusive License Agreement'), WRF granted Ostex an exclusive, worldwide license
to make,  have  made,  assign,  sublicense,  lease,  develop,  enhance,  modify,
produce, reproduce, demonstrate, market, promote, sell, distribute, use, exploit
and  otherwise  commercialize  and  prepare  derivations  of certain of the Bone
Resorption Technology (as defined below).

         C. Ostex engages in the research, development, manufacture, and sale of
diagnostic and therapeutic  products in the field of bone and mineral metabolism
in applications  related to bone  resorption and collagen and connective  tissue
degradation, and has developed a proprietary immunoassay to determine the levels
of NTx epitope  collagen  metabolite  resulting from bone resorption ('NTx Assay
Technology' as further defined below),  which it has implemented in a microtiter
format suitable for use in centralized  laboratories  ('Osteomark(R)  Laboratory
Test').

         D. Metrika has  developed a  single-use  disposable  diagnostic  device
('Digital Response(R) Device' as defined below) which uses Metrika's proprietary
MODM(R) Technology (as defined below).

         E. Ostex and  Metrika  entered  into that  certain  Joint  Development,
License  and  Co-Marketing   Agreement  dated  April  10,  1997   ('Co-Marketing
Agreement')  pursuant to which the parties would jointly  develop,  manufacture,
promote,  market and sell a Digital  Response Device  incorporating  Ostex's NTx
Assay Technology.

         F. The parties  now desire to  supersede  and replace the  Co-Marketing
Agreement by entering into this Agreement pursuant to which Metrika will develop
and supply the  NTx/Digital  Response  Device (as defined  below) to Ostex,  and
Ostex will have the exclusive  right to market and  distribute  the  NTx/Digital
Response Device throughout the world.






                               TERMS OF AGREEMENT

         In  consideration  of the mutual  covenants  and  agreements  contained
herein,  and  for  other  good  and  valuable  consideration,  the  receipt  and
sufficiency of which are hereby acknowledged, the parties agree as follows:

         1.       DEFINITIONS. The following definitions shall apply throughout 
                  this Agreement.

                  'AFFILIATE'  means, with respect to any person or entity,  any
individual,  corporation,  company, firm, partnership or other entity controlled
by, in control of, or under common  control with,  such person or entity,  where
'control'  means  direct or  indirect  legal or  beneficial  ownership  of fifty
percent (50%) or more of the shares, business interests, or voting securities of
another corporation, company, firm, partnership or other entity.

                  'BONE  RESORPTION  TECHNOLOGY'  means all  technology to which
Ostex  has any  rights  as of the  Effective  Date or  during  the  Term of this
Agreement  relating  to  assays,  methods,  and  materials,  including  Critical
Reagents,   for  measuring  bone  collagen   metabolites,   including,   without
limitation,  that technology  developed in connection with research conducted by
Dr.  David Eyre,  owned by the  Washington  Research  Foundation,  and  licensed
exclusively  to  Ostex.  The  Bone  Resorption   Technology  includes,   without
limitation, the urinary diagnostic assay known as the Osteomark immunoassay.

                  'CLIA WAIVER' means the receipt of a certificate from the U.S.
Center for  Disease  Control  confirming  the waived  status of the  NTx/Digital
Response  Device  for  POC  applications  pursuant  to the  Clinical  Laboratory
Improvement Amendments of 1988 ('CLIA').

                  'CONFIDENTIAL   INFORMATION'   means  any  and  all   normally
non-public  information  communicated or disclosed by one party ('Discloser') to
the other party ('Recipient'),  including information  describing or relating to
the  Discloser's   business  and  marketing  plans  and  strategies,   financial
information,  or customer information,  and any and all information communicated
or  disclosed  by the  Discloser  to  Recipient  describing  or  relating to the
Discloser's  research and  development,  Know-How,  inventions,  trade  secrets,
technical data, formulae,  drawings,  designs,  software, models, samples, kits,
processes,  product development data and information,  provided,  however,  that
'Confidential  Information' shall not be deemed to include information which the
Recipient can  demonstrate by written proof:  (i) is now, or hereafter  becomes,
through no fault on the part of the  Recipient,  generally  known or  available;
(ii) is known by the Recipient at the time of receiving such information;  (iii)
is furnished generally to others by Discloser without restriction on disclosure;
(iv) is  hereafter  furnished  to the  Recipient  by a third party  unrelated to
Discloser,  as a  matter  of  right  and  without  any  breach  of any  duty  of
non-disclosure;  (v) is independently  developed by the Recipient without use of
or  reference  to any  Confidential  Information  of  Discloser;  or (vi) is the
subject of express written permission to disclose provided by Discloser. Without
limiting the generality of the foregoing,  Confidential  Information may include
information developed by a the Discloser during the course of this Agreement.

                  'COGS' means all costs of materials and components  (including
purchase costs and royalties payable to third parties) and personnel expended on
manufacturing and quality control,  relating to the Critical Regents supplied by
Ostex to Metrika




                  NOTE: CONFIDENTIAL TREATMENT REQUESTED.



                  hereunder,   plus  a   portion   of   manufacturing   overhead
(including, but not limited to, inventory costs relating to spoilage, insurance,
depreciation,  administrative  expenses,  indirect employee expenses and quality
assurance   expenses)   based  on  the  portion  of   resources   allocated   to
manufacturing,  calculated in accordance with U.S. generally accepted accounting
principles,  less that portion of such costs  attributable to capacity allocated
to other products manufactured by Ostex.

                  'CRITICAL  REAGENTS'  means the set of  reagents  required  by
Metrika to be supplied by Ostex, or an Ostex  appointed  third party  hereunder,
for use in the  manufacture,  quality  control,  and/or clinical trials or field
studies of the  NTx/Digital  Response  Device.  As of the Effective Date of this
Agreement,  such Critical Reagents are limited to: (i) the XXXXX antibody (clone
designation XXXXX); (ii) the NTx Concentrate described in Ostex DOC No. 2007, or
equivalent   material  which  can  be  used  for  formulation  of  controls  and
calibrators;  (iii) the Gold Reference Calibrators ('3000 nM Gold') described in
Ostex DOC No.  0019;  and (iv) the FDA  cleared  Osteomark  Laboratory  Test Kit
manufactured  by Ostex.  These  Critical  Reagents  may be changed  upon  mutual
agreement  of the  parties  and  reasonable  notice  to scale  up to  commercial
quantities.  The  specifications  of the present Critical  Reagents are attached
hereto as Exhibit C.

                  'DIGITAL  RESPONSE  DEVICE'  means  that  certain   diagnostic
platform  developed  by Metrika  which  uses MODM  Technology  for  simultaneous
measurement  of  quantitative   immunoassays   and  general   chemistries  in  a
single-use,  fully disposable in vitro diagnostic device. Such device includes a
small  integrated  liquid crystal  display for display of results and a modified
serial port interface for communication  with an accessory docking station.  The
Digital Response Device is capable of calculating and displaying ratioed results
such as NTx (nM)/Creatinine (mM).

                  'DISCOVERY' means any scientific, technological, or commercial
invention, discovery, development, improvement, Know-How, or product made in the
course of  performing  the  activities  contemplated  by the parties  under this
Agreement, whether or not the same is patentable.

                  'FDA' means the U.S. Food and Drug Administration or any 
successor agency thereof.

                  'FIELD OF USE'  means  the  point-of-care  (POC)  (as  defined
below) and  over-the-counter  (OTC) (as  defined  below)  markets  and any other
commercial markets.

                  'QSR' shall mean  Quality  System  Regulation  as such term is
defined under the laws and regulations promulgated by the FDA.

                  'METRIKA  PATENT  RIGHTS' means any and all patents and patent
applications or equivalent  thereof,  anywhere in the Territory relating to MODM
Technology and the Digital Response  Device:  (i) that would be infringed by the
unlicensed use, sale, offer for sale and importation of the NTx/Digital Response
Device in the  Territory  in the  Field;  (ii) that are owned or  controlled  by
Metrika as of the  Effective  Date and during the Term;  and (iii)  under  which
Metrika has the right to license to Ostex hereunder.






NOTE: CONFIDENTIAL TREATMENT REQUESTED.

                  'MODM  TECHNOLOGY' means that certain  proprietary  technology
developed by Metrika which integrates digital electronics,  micro-optics and dry
reagent   chemistries   and  which  allows   quantitative,   reflectance   based
measurements of immunoassays (such as the measurement of urinary NTx levels) and
general chemistries (such as the measurement of urinary creatinine levels) to be
measured simultaneously.

                  'NTX ASSAY  TECHNOLOGY' means an immunoassay for bone collagen
metabolites  comprising  an NTx Epitope,  together with  associated  controls to
which  Ostex has  rights  as of the  Effective  Date or during  the Term of this
Agreement.

                  'NTX/DIGITAL  RESPONSE  DEVICE'  means  that  certain  Digital
Response Device  incorporating  NTx Assay  Technology  developed and supplied by
Metrika to Ostex  pursuant to this  Agreement  as defined in the  specifications
therefor attached hereto as EXHIBIT A ('SPECIFICATIONS').

                  'NTX EPITOPE' means a conformational structure included within
the natural  crosslinked  amino-terminal  telopeptides from type I collagen,  to
which the monoclonal  antibody (mAb) produced from the hybridoma XXXXX and/or an
appropriate  alternative  antibody  binds  specifically  by  immunoaffinity,  or
similar NTx epitopes  resulting from bone  resorption  which may be developed or
marketed by Ostex in any form during the Term of this Agreement.

                  'OSTEX INTELLECTUAL PROPERTY RIGHTS' means all Ostex Patent 
Rights and Ostex Know-How.

                  'OSTEX  KNOW-HOW'  means any method,  information,  procedure,
process,  composition of matter,  biological  material,  or other subject matter
relating to the NTx Assay  Technology,  Bone  Resorption  Technology or Critical
Reagents which: (i) has been developed or acquired by Ostex,  prior to or during
the Term of this  Agreement;  (ii) may be  required  by Metrika  to develop  and
manufacture  the NTx/Digital  Response  Device  pursuant to this Agreement;  and
(iii) Ostex has the right to license to Metrika hereunder.

                  'OSTEX  PATENT  RIGHTS'  means any and all  patents and patent
applications or equivalent  thereof,  anywhere in the Territory  relating to the
NTx Assay  Technology or Critical  Reagents,  including but not limited to those
patents  and patent  applications  licensed to Ostex  pursuant to the  WRF/Ostex
Exclusive License  Agreement:  (i) that would be infringed by the unlicensed use
of the  Critical  Reagents  and/or  NTx  Assay  Technology  and  the  unlicensed
development,  manufacture and use of the NTx/Digital  Response Device; (ii) that
are owned by or  controlled  by Ostex as of the  Effective  Date and  during the
Term; and (iii) under which Ostex has the right to license to Metrika hereunder.

                  'OTC' shall mean XXXXXXXXXXXX.

                  'POC' shall mean XXXXXXXXXXXXX.

                  'SALE'  shall  mean  any and all  transactions  whereby  Ostex
sells, leases, rents, or otherwise transfers or disposes of to (i) any end-user,
including without




                  limitation  any  physician's  office  or  clinical  laboratory
purchaser, or (ii) any third-party  distributor,  any right of ownership, or any
other right to possession.

                  'SHELF-LIFE'  shall  mean the time  interval  from the date of
product manufacture to product shelf life expiration.

                  'TERRITORY' means all of the countries of the world.

         2.       LICENSE GRANTS.

                  2.1 OSTEX INTELLECTUAL  PROPERTY RIGHTS.  Subject to the terms
of this  Agreement,  Ostex  hereby  grants to  Metrika  and its  Affiliates  and
permitted assigns, for the Term of this Agreement, and Metrika hereby accepts, a
non-exclusive,  worldwide  (except  in  Japan)  license  in and  under the Ostex
Intellectual  Property  Rights,  to use the  Critical  Regents and the NTx Assay
Technology to develop,  manufacture,  and use (so long as such use is restricted
to the use  required  by  Metrika  to perform  its  responsibilities  under this
Agreement or for  Metrika's  own  internal  research  and  development  purposes
relating to the Digital  Response  Device or MODM  Technology)  the  NTx/Digital
Response Device, and to sell the NTx/Digital  Response Device only to Ostex. The
license  granted to Metrika  hereunder may not be  sublicensed or transferred by
Metrika,  except to third party manufacturers appointed by Metrika in accordance
with Section 4.2.

                  2.2 METRIKA INTELLECTUAL PROPERTY RIGHTS. Subject to the terms
of this  Agreement,  Metrika  hereby  grants  to Ostex  and its  Affiliates  and
permitted assigns, for the Term of this Agreement,  and Ostex hereby accepts, an
exclusive  (as set forth in Section  5.2.1),  license  in and under the  Metrika
Patent Rights, to market, promote, have marketed and promoted,  sell, have sold,
distribute and have  distributed  (but not to make or have made)  throughout the
Territory,  the NTx/Digital Response Device within the Field of Use. The license
granted to Ostex  hereunder  may not be  sublicensed  or  transferred  by Ostex,
except to Subdistributors in accordance with Section 5.1.

                  2.3  RESERVATION  OF  RIGHTS.  Except  as  expressly  provided
herein, no right,  title, or license is granted,  whether express or implied, by
either party to the other to such party's Intellectual Property Rights.  Nothing
in this  Agreement  shall be deemed to restrict  either party's right to exploit
any of its own Intellectual  Property Rights not expressly  granted to the other
party hereunder.

         3.       DEVELOPMENT.

                  3.1  METRIKA  RESPONSIBILITIES.   Subject  to  the  terms  and
conditions of this  Agreement,  Metrika shall be responsible  for development of
the NTx/Digital Response Device. In addition,  Metrika shall be responsible for:
(i)  performing  clinical  trials and obtaining FDA clearance to market and sell
the NTx/Digital Response Device for POC applications in the U.S.; (ii) obtaining
CLIA Waiver for the  NTx/Digital  Response  Device for POC  applications;  (iii)
obtaining  and  maintaining  the CE Mark  and all  other  required  pan-European
certifications for the NTx/Digital Response Device, and




                  NOTE: CONFIDENTIAL TREATMENT REQUESTED.



(iv) providing reasonable  assistance and existing performance or stability data
reasonably  requested  by  Ostex  and/or  its  appointed  distributors  which is
necessary to obtain marketing and/or reimbursement  approval for countries other
than the United States. Ostex and Metrika hereby agree to the pre-launch working
relationship  responsibilities  for the POC  NTx/Digital  Response Device as set
forth in EXHIBIT B hereto.

                  3.2  DEVELOPMENT  TIMELINE.  Metrika shall use its  reasonable
commercial  efforts to obtain  510(k)  clearance  for the  NTx/Digital  Response
Device  for POC  applications  prior to XXXXX  and  obtain  CLIA  Waiver  of the
NTx/Digital Response Device for POC applications prior to XXXXX. Notwithstanding
anything to the contrary in Section 10 of this  Agreement,  if Metrika  fails to
obtain  such  510(k)  clearance  or CLIA  Waiver by the dates sets forth in this
Section 3.2, Ostex may elect to terminate this  Agreement  immediately,  with no
cure  period  available  to  Metrika,  upon  written  notice  to  Metrika.  Such
termination shall constitute  Ostex's sole and exclusive remedy for such failure
by Metrika to meet such dates.

                  3.3 DOCKING STATIONS. If Metrika develops,  during the Term, a
universal  docking station for use with Digital Response  Devices,  Metrika will
make such docking station available to Ostex on terms XXXXXXXXXXXXXX under which
Metrika has made such instrument(s) available to third parties,  including third
party  distributors,  provided that: (i) such third party has not paid Metrika a
license,  development  or other fee for  rights to such  instrument(s);  or (ii)
there  are  no  terms,  commercial  circumstances  and  conditions  which  would
compensate  for Metrika's  granting of such more  favorable  terms to such third
parties; or (iii) such reasonably less terms are no less than a XXXXXX margin to
Metrika, so long as Metrika is not making such docking station available at more
favorable terms (XXXXXXXXXXXXX  Metrika) to third parties that are not described
by (i) or (ii) of this Section 3.3.

                  3.4      OSTEX RESPONSIBILITIES.

                           3.4.1    CRITICAL REAGENTS FOR DEVELOPMENT OF 
NTX/DIGITAL RESPONSE DEVICE.  Ostex shall
supply to Metrika such  reasonable  quantities of Critical  Reagents as shall be
necessary or useful for the purpose of Metrika  performing its  responsibilities
described under Section 3.1.

                           3.4.2    ASSISTANCE TO METRIKA.  Upon reasonable 
request by Metrika, Ostex shall make
available  key  employees  to  provide  consultation,  advice,  assistance,  and
scientific  direction  to Metrika  relating to  development  of the  NTx/Digital
Response Device.  Without limiting the generality of the foregoing,  Ostex shall
make available to Metrika  personnel  trained in and  knowledgeable  of the Bone
Resorption   Technology  and  performance   characteristics  of  the  NTx  Assay
Technology.  Except as otherwise  specifically provided in this Agreement,  each
party shall bear its own costs and

expenses associated with all facilities, materials, and employee time devoted to
this effort.  Neither  party shall be obligated to disclose  their  Confidential
Information to the other,  except to the extent necessary for the performance of
each party's  obligations under this Agreement.  Ostex shall assist Metrika,  at
either  party's  reasonable  request,  in the  technical  training of a mutually
determined number of Metrika's employees,  such training to include provision of
information as to the nature, use and proper care of Critical Reagents. Any such
training shall be provided at Ostex's principal place of




NOTE: CONFIDENTIAL TREATMENT REQUESTED.

business,   and  Metrika   shall  be  solely   responsible   for  all  costs  of
transportation,  lodging,  and other  expenses  of trainees  incidental  to such
training.  During the Term hereof,  Ostex shall use its commercially  reasonable
efforts to respond to technical  questions or problems which may arise from time
to time in connection with the Critical Reagents and NTx Assay Technology.

                           3.4.3    CLINICAL AND REGULATORY. Other than as 
provided in Section 3.1, Ostex shall be
responsible  for all  additional  clinical and other  regulatory  activities and
obtaining all required approvals to market, distribute, and sell the NTx/Digital
Response Device in the Territory in the Field of Use. Ostex may contract Metrika
to perform any such regulatory activities upon terms and conditions to be agreed
to by the parties.

                  3.5 ACCESS TO  CLINICAL  DATA.  Each party  shall  provide the
other  party  with  full  access  to all  clinical  trial  data  and  regulatory
submissions, in such party's possession or control. It is acknowledged that such
information  will be subject to the  confidentiality  provisions set out in this
Agreement,  to the  extent  applicable,  as well as  confidentiality  provisions
necessary to protect patient privacy;  provided,  however, that such information
may,  as  necessary  and  appropriate,   be  transmitted  to  proper  regulatory
authorities in connection with the seeking of regulatory product approvals,  and
may be used in connection with Ostex's marketing  activities for the NTx/Digital
Response Device.

         4.       MANUFACTURE AND SUPPLY.

                  4.1  MANUFACTURING.  Metrika  shall  develop  the  capacity to
manufacture  reasonable commercial quantities of the NTx/Digital Response Device
in accordance  with the  Specifications  and QSR, and  thereafter  Metrika shall
manufacture  or have  manufactured  NTx/Digital  Response  Devices for supply to
Ostex pursuant to Section 4.5.  Metrika  shall,  during the Term, in good faith,
diligently  attempt to extend the Shelf-Life of the NTx/Digital  Response,  with
the objective of achieving a Shelf-Life of no less than XXXXX months by the time
the  NTx/Digital  Response  Device  receives 510 (k)  clearance  and the goal of
continuously  extending the  Shelf-Life  to not less than XXXXX months.  Metrika
will generate and document data to support  Shelf-Life  extensions in accordance
with FDA regulatory  requirements  including QSR.  Metrika shall notify Ostex in
writing  within thirty (30) days of achieving  any  extension of Shelf-Life  and
will provide Ostex with any supporting data and documentation therefor.

                  4.2 THIRD-PARTY  MANUFACTURING  ON BEHALF OF METRIKA.  Metrika
shall have the right to appoint a third party  manufacturer(s)  to conduct strip
manufacturing,  final  assembly,  and/or  quality  control  of  the  NTx/Digital
Response Device, provided that Metrika shall promptly notify Ostex in writing of
any such  appointment(s).  In the event that  Metrika  licenses a third party to
manufacture  NTx/Digital  Response  Devices to be  supplied  to Ostex under this
Agreement, Metrika shall ensure and provide evidence to Ostex demonstrating that
such third-party manufacturer complies with QSR and all




                  applicable governmental regulations relating thereto and is in
compliance with the quality standards established by the International Standards
Organization,  Rules 9002 and  amendments or successors  thereto ('ISO 9000') or
warrants that it will comply with such standards when legally required to do so.

                  4.3 PRODUCT  WARRANT;  QUALITY  CONTROL.  Metrika  warrants to
Ostex that all NTx/Digital  Response  Devices sold by Metrika to Ostex hereunder
shall (i) comply with the Specifications when used in accordance with applicable
Metrika  instructions,  as may be modified by mutual  agreement  of the parties,
(ii) be free from defects in material and workmanship, and (iii) comply with all
applicable  laws,   rules  and  regulations   related  to  the  manufacture  and
distribution  of such  product  (to the extent  applicable  to a  manufacturer).
Without  limiting the  generality of the  foregoing,  Metrika  warrants that all
NTx/Digital  Response  Devices  manufactured  and supplied for the United States
market under this Agreement shall be manufactured, tested, documented, packaged,
and transported in compliance with QSR and that all NTx/Digital Response Devices
manufactured  and supplied under this Agreement,  regardless of intended market,
shall  be  manufactured,   tested,  documented,   packaged  and  transported  in
compliance with  appropriate  quality  assurance  requirements  agreed to by the
parties.  Ostex  shall have the right to audit and inspect  Metrika  facilities,
books, and records,  during normal business hours and upon reasonable  notice to
Metrika, but only to the extent reasonably necessary to confirm such compliance,
and only in good faith.  Metrika  further  represents  that it is working toward
compliance with the quality standards  established by ISO 9000 and warrants that
it will comply with such standards when legally  required to do so. In the event
that Ostex  demonstrates that any NTx/Digital  Response Device supplied pursuant
to this Agreement fails to meet these  specifications  and warranties during the
Shelf-Life of such NTx/Digital  Response Device,  Metrika shall, as Ostex's sole
remedy for such failure, immediately replace said product (demonstrated by Ostex
as non-conforming, in accordance with reasonable procedures), with product which
conforms to the above specifications and warranties.  These warranties shall not
apply to any item that is subjected to abuse,  stress, or misuse, or used in any
manner inconsistent with applicable Metrika instructions.

                  4.4 CRITICAL REAGENTS FOR MANUFACTURING  NTX/DIGITAL  RESPONSE
DEVICE.  Ostex shall supply to Metrika (or such manufacturer(s) as Metrika shall
designate),  and Metrika (or said  manufacturer(s))  shall  purchase from Ostex,
Metrika's (or said  manufacturer's)  requirements for Critical  Reagents for the
purpose of manufacturing  the NTx/Digital  Response Device pursuant to the terms
and conditions of this Agreement.

                           4.4.1  FORECAST OF DEMAND.  Within sixty (60) days of
the start of each calendar
quarter,  Metrika or its  designated  manufacturer(s)  shall  deliver to Ostex a
'rolling' forecast of quantities of Critical Reagents to be purchased by Metrika
and its  designated  manufacturer(s)  and supplied by Ostex during the following
quarter,  and each of the subsequent  three  quarters (the 'Rolling  Forecast').
Each Rolling  Forecast  shall be considered a purchase order with respect to the
forecasted demand for Critical Reagents over the first three (3) months thereof.
The forecasted  demand for the remaining three quarters of each Rolling Forecast
shall be used by Ostex  for  planning  purposes,  but shall  not be  binding  on
Metrika and its designated manufacturer(s).

                           4.4.2    FAILURE TO SUPPLY.  In the event that Ostex
     does not meet the demand for Critical Reagents ordered pursuant to Section,
4.4.1,  excepting a suspension of further shipment pursuant to Section 4.4.4, in
addition to all other rights available  hereunder,  Metrika shall be relieved of
all supply obligations to Ostex of NTx/Digital  Response Devices hereunder until
Ostex is able to supply Metrika's, or its designated manufacturer's,  demand for
Critical Reagents.






NOTE: CONFIDENTIAL TREATMENT REQUESTED.

                           4.4.3    PRICE.  Metrika or its designated 
     manufacturer(s)  shall pay Ostex a non-royalty  transfer price for Critical
Reagents ('Transfer Price').  All Critical Reagents,  excluding the FDA cleared,
96 well  Osteomark  Laboratory  Test Kit  manufactured  by  Ostex,  will  have a
Transfer Price equal to (i) XXXXX; or (ii) XXXXXXXXXXX; or
(iii) some other  mutually  agreed upon  Transfer  Price.  Ostex shall  maintain
accurate books and records with respect to the calculation of XXXXX the Critical
Reagents supplied to Metrika hereunder for a period of three (3) years. Upon the
request  of  Metrika,  Ostex  will  provide  access  to  an  independent  public
accountant  designated  by  Metrika,  but no more than once per  calendar  year,
during regular business hours and upon reasonable  advance prior notice,  to all
accounting  records  necessary  or  appropriate  to verify  XXXXX  for  Critical
Reagents supplied to Metrika hereunder. Any adjustment determined appropriate by
such audit shall be due and payable within thirty (30) days following completion
of such audit,  together with  interest  calculated at a rate equal to the prime
lending rate reported in the Wall Street Journal for the last day of the audited
period plus two percent (+2%), or the maximum interest rate then permitted under
applicable  laws,  whichever  rate is lower.  All costs for such audits shall be
borne by Metrika  unless  the audit  shows an over  charge of XXXXX or more,  in
which case the costs of said audit shall be borne by Ostex.  The Transfer  Price
for the FDA cleared, 96 well Osteomark Laboratory Test Kit manufactured by Ostex
shall be XXXXX each.

                           4.4.4    PAYMENT.  Payment for each shipment of 
     Critical   Reagents   shall   be  made  by   Metrika   or  its   designated
manufacturer(s)  within thirty (30) days of the date of invoice, it being agreed
that such invoice shall not be dated prior to shipment of the Critical  Reagents
to which such invoice relates. In the event that
Metrika or its designated manufacturer(s) fails to comply with the payment terms
of this  Section  4.4.4,  Ostex  shall have the right,  in addition to all other
rights  available  under this  Agreement,  to (i)  suspend  further  shipment of
Critical  Reagents  until such  breach is cured or (ii) with  Metrika's  written
approval,  offset amounts owed by Ostex to Metrika for the NTx/Digital  Response
Device  invoiced  pursuant  to Section  4.5.6  with the  amount  owed under this
Section 4.4.4.

                           4.4.5    ACTIONS  REQUIRING  OSTEX'S PRIOR  
     WRITTEN CONSENT.  Metrika shall not, without Ostex's prior written consent,
which consent may be withheld at Ostex's sole discretion, manufacture or use any
Critical Reagent to the extent such Critical Reagents are proprietary to Ostex.

                           4.4.6    THIRD-PARTY MANUFACTURING ON BEHALF OF 
     OSTEX.  In the event that Ostex contracts with a third party to manufacture
Critical  Reagents to be supplied under this  Agreement,  Ostex shall ensure and
provide evidence to Metrika demonstrating that
such third-party  manufacturer complies with QSR and all applicable governmental
regulations  relating  thereto and is in compliance  with the quality  standards
established  by  the  International  Standards  Organization,   Rules  9002  and
amendments  or  successors  thereto ('ISO 9000') or warrants that it will comply
with such standards when legally required to do so.






                                            4.4.7    PRODUCT WARRANTY; QUALITY 
     CONTROL. Ostex warrants to Metrika and its designated  manufacturer(s) that
all Critical Reagents sold by Ostex or its contract manufacturer hereunder shall
(i) comply with the  specifications  therefor  attached  hereto as EXHIBIT C and
amendments  thereto as mutually  agreed upon by the  parties,  (ii) be free from
defects in material and workmanship,  and (iii) comply with all applicable laws,
rules and  regulations  related  to the  manufacture  and  distribution  of such
product (to the extent  applicable  to a  manufacturer).  Without  limiting  the
generality  of  the  foregoing,   Ostex  warrants  that  all  Critical  Reagents
manufactured and supplied to Metrika and its designated  manufacturer under this
Agreement shall be manufactured,  tested, documented,  packaged, and transported
in  compliance  with QSR by the 510(k)  clearance  date;  and that all  Critical
Reagents manufactured and supplied under this Agreement,  shall be manufactured,
tested,  documented,  packaged and  transported  in  compliance  with  Metrika's
reasonable quality assurance requirements. Metrika shall have the right to audit
and inspect Ostex  facilities,  books,  and records to confirm such  compliance.
     Ostex further  represents  that it is working  toward  compliance  with the
quality standards  established by ISO 9000 and warrants that it will comply with
such standards when legally  required to do so. In the event that Metrika or its
designated  manufacturer(s)  demonstrates  within one year of  receipt  that any
Critical  Reagent  supplied  pursuant  to this  Agreement  fails  to meet  these
specifications  and  warranties,  Ostex shall, as Metrika's sole remedy for such
failure,  immediately  replace  said  product  (demonstrated  by  Metrika or its
designated  manufacturer(s)  as  non-conforming,  in accordance  with reasonable
procedures),  with  product  which  conforms  to the  above  specifications  and
warranties.  These  warranties  shall not apply to any item that is subjected to
abuse,  stress,  or misuse,  or used in any manner  inconsistent with applicable
Ostex instructions.

                                    4.4.8   DELIVERY.  All Critical Reagents 
     purchased  under this Agreement  shall be shipped to the location set forth
in the purchase order therefor,  F.O.B.  Origin. All freight and insurance shall
be paid by Metrika.  Title and risk of loss  passes to Metrika  when the Product
leaves  Ostex's or its third party's  manufacturing  facility.  Metrika shall be
solely responsible for the payment of all freight and insurance and other costs,
expenses,  fees, duties,  imports and charges of whatever kind in nature arising
from the shipment, delivery or importation of the Critical Reagents to Metrika's
place of manufacture. Metrika shall solely be responsible for taking all actions
necessary to obtain clearance to import the Critical Reagents to Metrika's place
of manufacture and Metrika warrants that it will comply in all respects with any
applicable export restrictions for the Critical Reagents.

                           4.4.9    INVENTORY.  At all times during the Term 
     of this  Agreement,  Ostex shall  supply and keep  sufficient  inventory of
Critical  Reagents to carry out reasonable  demand or orders for the NTx/Digital
Response Device(s) without undue delay.

                  4.5  SUPPLY OF  NTX/DIGITAL  RESPONSE  DEVICE.  Subject to the
terms and conditions of this  Agreement,  Metrika shall supply,  and Ostex shall
purchase from




                  Metrika  (or  its  designated  manufacturer),  all of  Ostex's
requirements  for NTx/Digital  Response Devices for sale in the Territory in the
Field of Use hereunder.

                  4.5.1   MINIMUMS.   Commencing  from  the  receipt  of  510(k)
clearance  of the  NTx/Digital  Response  device,  Ostex shall be  obligated  to
purchase from Metrika  minimum  quantities of NTx/Digital  Response  Devices per
month, or such quantity per quarter equal to the sum of the quantities  required
for 3  individual  months  ('Minimum  Volumes')  in  accordance  with the  chart
attached hereto as EXHIBIT D; provided,  however, Ostex shall not be required to
purchase the Minimum Volumes  applicable for a month if, during such month:  (A)
the  NTx/Digital  Response  Device does not have either:  (i) the required  CLIA
Waiver status; or (ii) the required Shelf-Life as set forth in EXHIBIT D; or (B)
supplies of the NTx/Digital  Response Device are not timely delivered by Metrika
or its  designated  manufacturer  to Ostex in  accordance  with this  Agreement,
unless  such  failure  by  Metrika  or its  designated  manufacturer  to  supply
NTx/Digital  Response  Devices to Ostex results from the failure of Ostex or its
designated  manufacturer  to timely  supply  Critical  Reagents  to  Metrika  in
accordance with this Agreement;  or (C) the NTx/Digital Response Device does not
meet the  Specifications  in  Exhibit  A,  unless  such  non-conformance  of the
NTx/Digital  Response Device to the Specifications is due to the non-conformance
of any of the Critical  Reagents used in the  manufacture or quality  control of
the NTx/Digital  Response Device to the  specifications for Critical Reagents in
Exhibit C.

                           4.5.2    FORECAST OF DEMAND.  Within sixty (60) 
     days of the start of each calendar quarter,  Ostex shall deliver to Metrika
a rolling forecast,  by quarters,  of the quantities of the NTx/Digital Response
Device for which Ostex expects to submit  purchase  orders during the subsequent
four  quarters  (the  'Rolling  Forecast').  Ostex shall be  obligated to submit
purchase  orders  for  NTx/Digital  Response  Devices  in  accordance  with  the
quantities  corresponding  to the first  quarter of each Rolling  Forecast.  The
quantities forecasted for the remaining period of each Rolling Forecast shall be
used by Metrika for planning purposes and shall not be binding on Ostex.

                           4.5.3    ORDER AND ACCEPTANCE.  All orders for the 
     NTx/Digital  Response  Device shall be by means of signed written  purchase
orders by Ostex to  Metrika,  sent to Metrika at  Metrika's  address  for notice
hereunder  specifying the required quantity and delivery address, and requesting
a delivery  date not less than sixty (60) days after  Metrika's  receipt of such
purchase  order.  Orders  may  initially  be placed by  telephone  or  telecopy;
PROVIDED,  HOWEVER,  that a signed  confirming  purchase  order is  received  in
writing (which may include telecopy  transmission)  by Metrika.  Notwithstanding
anything  herein to the  contrary,  no order shall be binding upon Metrika until
accepted by Metrika in  writing.  Each party may cancel or  reschedule  purchase
orders only with prior written approval of the other party.

                           4.5.4    DELIVERY.  NTx/Digital Response Devices 
     shall be delivered on the date specified in the purchase orders  hereunder.
Metrika  agrees to deliver  NTx/Digital  Response  Devices no later than two (2)
months after its date of manufacture.




                           All NTx/Digital Response Devices delivered pursuant 
     to the terms of this Agreement shall be delivered  pre-labeled and packaged
in a product  box with a dropper  and  package  insert.  Metrika  shall  provide
NTx/Digital Response Devices, foil pouched and labeled with a single-color laser
printed  label,  and one dropper  sealed in each pouch.  Ostex shall provide the
product box,  package insert and all other labels  ('Packaging  Materials')  for
Metrika's  use  in  packaging  the  NTx/Digital  Response  Device  as  described
hereunder.  Metrika shall  suitably  pack the  NTx/Digital  Response  Device for
shipment  by  surface or air,  at  Ostex's  discretion,  in  Metrika's  standard
shipping  cartons.  Metrika shall ship the NTx/Digital  Response Device to Ostex
using the carrier specified in the purchase order;  PROVIDED,  HOWEVER,  that if
Ostex does not  provide  instructions  with  respect to the  carrier to be used,
Metrika  shall  select the carrier.  The  NTx/Digital  Response  Device shall be
shipped F.O.B. Metrika's  manufacturing facility in Sunnyvale,  California.  All
freight and insurance  shall be paid by Ostex.  Title and risk of loss passes to
Ostex when the Product leaves Metrika's manufacturing  facility.  Ostex shall be
solely responsible for the payment of all freight and insurance and other costs,
expenses,  fees, duties,  imports and charges of whatever kind in nature arising
from the shipment,  delivery or importation of the  NTx/Digital  Response Device
into the  Territory.  Ostex shall solely be  responsible  for taking all actions
necessary to obtain clearance to import the NTx/Digital Response Device into and
throughout  the Territory and Ostex warrants that it will comply in all respects
with any applicable export restrictions for the NTx/Digital Response Device. The
Parties will work together in the event of supply  problems to ensure  customers
do not switch to alternative products.

                           4.5.5    INVOICING.  Metrika shall submit an 
     invoice,  packing  list and airway bill to Ostex upon each  shipment of the
NTx/Digital  Response  Device ordered by Ostex.  All invoices and other shipping
documents  shall be sent  first by fax,  followed  by  business  mail to Ostex's
address for notices  hereunder,  without regard to the actual shipping  address.
Each such invoice shall state  Ostex's  aggregate and unit invoice price for the
NTx/Digital Response Device in a given shipment.

                           4.5.6    PRICING AND PAYMENT.  The transfer price 
     for each unit of  NTx/Digital  Response  Device  hereunder  shall be as set
forth in EXHIBIT D hereto.  Ostex shall make all payments under the Agreement to
Metrika in United States  dollars as directed by Metrika within thirty (30) days
after the receipt by Ostex of the invoice.

         5.       COMMERCIALIZATION AND DISTRIBUTION.

                5.1  COMMERCIALIZATION  AND DISTRIBUTION  SALES.  Subject to the
terms and  conditions  of this  Agreement,  Ostex shall have the  exclusive  (as
defined in Section  5.2.1 hereto)  right to market,  promote,  have marketed and
promoted,  sell,  have sold,  distribute and have  distributed  the  NTx/Digital
Response  Device  throughout the Territory  within the Field of Use.  Subject to
Section  5.2.2,  Ostex  agrees to use its best  efforts  to market  and sell the
NTx/Digital  Response  Device in the  Territory  in the Field of Use;  provided,
however,  the parties  acknowledge  that prior to the Effective Date,  Ostex has
granted to Mochida Pharmaceutical  Company, Ltd. ('Mochida') exclusive rights to
commercialize




                  NOTE: CONFIDENTIAL TREATMENT REQUESTED.

the NTx Assay  Technology in Japan, and therefore Ostex shall not have the right
to promote,  market and sell the NTx/ Digital  Response  Device in Japan without
the prior agreement of Mochida, provided,  however, that Ostex agrees to use its
reasonable  commercial  efforts to obtain rights from Mochida for the promotion,
marketing and sale of the  NTx/Digital  Response Device in Japan or have Mochida
distribute the NTx/Digital  Response Device in Japan. Ostex shall have the right
to   appoint    subdistributors    for   the    NTx/Digital    Response   Device
('Subdistributors').



                  5.2      EXCLUSIVITY.

                           5.2.1  During  the  Term of this  Agreement,  Metrika
shall not itself market or sell, or
grant rights to third parties to market or sell, the NTx/Digital Response Device
or any other Digital  Response  Device that  measures  XXXXXXX that will compete
with the NTx/Digital Response Device.

                           5.2.2  The   parties   acknowledge   that  Ostex  has
disclosed to Metrika that prior to the
Effective Date, Ostex has entered into an agreement with (i) Hologic, Inc. dated
January 14, 1997,  whereby Ostex will be marketing and selling a Serex developed
device containing the NTx Assay Technology ('Serex Device') and (ii) Johnson and
Johnson Clinical Diagnostics, Inc. ('JJCD') dated June 7, 1995, whereby JJCD has
(a) rights to  manufacture  and market an  over-the-counter  and/or POC  devices
incorporating the NTx Assay Technology,  (b) rights to incorporate the NTx Assay
Technology into JJCD's  laboratory  based clinical  analyzer , and (c) rights to
sell Ostex's Osteomark microtiter plate assay product . Ostex hereby agrees that
during  the Term of this  Agreement,  other  than the Serex  Device and the JJCD
over-the-counter  or POC  products,  it will not itself market or sell, or grant
rights to third parties to market or sell, in the Territory  (except  Japan) any
other  XXXXXXXXXXXXXXX  device containing the NTx Assay  Technology,  XXXXXXXXX,
other than the NTx/Digital Response Device.

                  5.3  OPTION  TO  OSTEX.  Metrika  hereby  grants  to  Ostex an
exclusive  option to negotiate and enter into an agreement  with Metrika for the
worldwide,  exclusive distribution rights to a Digital Response Device measuring
XXXXXXX,  which option may be exercised  during the period  commencing  from the
Effective Date and expiring XXXXXXX ('Option Period');  provided,  however,  any
obligations  and rights of the  parties  pursuant  to this  Section 5.3 shall be
extinguished if the parties have not entered into a definitive  agreement within
one (1) month after the expiration of the Option Period.

                  5.4 OVER-THE-COUNTER APPLICATIONS. If Ostex signs an agreement
with a company to assist  Ostex in the  marketing  of the  NTx/Digital  Response
Device to the  over-the-counter  market, and that agreement includes an up-front
payment to Ostex, Metrika will receive XXXXX payment received by Ostex and XXXXX
given in consideration for such  over-the-counter  marketing  rights.  Metrika's
portion  of  such  payments  or fees  will be  calculated  based  on the  amount
remaining from such payments or fees after Ostex has paid WRF such  compensation
that  it  is  entitled  to as  described  in  the  WRF/Ostex  Exclusive  License
Agreement.  Fees shall include any royalty,  license, option, and milestone fees
paid  for  the  marketing  rights  described  herein,   but  shall  not  include
non-monetary  consideration,  such  as  payment  by  the  company  of  clinical,
regulatory,  or  packaging  costs  incurred  by  Ostex  for  adaptation  of  the
NTx/Digital  Response Device for the  over-the-counter  market.  Ostex agrees to
inform Metrika of all  discussions,  negotiations  and subsequent deals with any
over-the-counter partners.






                  5.5  REPRESENTATIONS  TO CUSTOMERS.  Ostex shall not incur any
liability  on behalf of Metrika,  nor describe or hold itself out as an employee
or representative of Metrika, nor make any claims, warranties or representations
with respect to the NTx/Digital Response Device except as previously approved in
writing by Metrika.

                  5.6  SERIOUS  INJURY.  Each party  shall,  within  twenty-four
hours,  advise  the other by  telephone,  (with  follow-up  hard  copy,  receipt
confirmed)  of any  adverse  effect or  malfunction  related to the  NTx/Digital
Response  Devices or the Critical  Reagents of which the  notifying  party gains
knowledge  during the Term of this Agreement that may have caused or contributed
to, or should it reoccur is likely to cause or contribute  to,  serious  injury,
illness,  or death.  The notifying party shall include in the  notification  the
name,  address,  and  telephone  number of the person or entity  purchasing  the
product in  question,  the name,  address,  and  telephone  of the  patient  (if
different), and the lot or serial number of the Critical Reagents or NTx/Digital
Response Device involved in the incident, as appropriate.

                  5.7 PRODUCT RECALL.  If either party believes that a recall of
the NTx/Digital  Response  Device is necessary or appropriate,  it will promptly
notify the other,  and the parties  will (unless such recall is required by law)
discuss whether such recall is necessary or  appropriate,  and shall discuss the
manner in which any agreed or required recall shall be conducted. If a recall is
not required by law and the parties cannot agree whether the recall is necessary
or  appropriate,  either party may elect to conduct the recall in question.  The
parties shall  cooperate with each other in conducting any such recall.  All out
of pocket costs of a required or agreed  recall  shall be shared  equally by the
parties,  unless and to the extent that such recall is the result of a breach of
the warranties  hereunder by one party,  in which case such costs shall be borne
by the  breaching  party.  All costs of a recall to which the  parties  have not
agreed  shall be borne by the party that elects to conduct the recall,  provided
that if a court of competent jurisdiction determines that said recall was caused
by (i) the fact that any Critical Reagents are in violation of applicable law or
the terms of this Agreement,  or any error, defect or  misrepresentation  in the
Packaging  Material,  then the costs and  expenses of such recall as well as any
reasonable  attorneys'  fees  related  to such  determination  shall be borne by
Ostex,  or (ii) the fact that any  NTx/Digital  Response  Device as  supplied by
Metrika is in violation of applicable law or the terms of this  Agreement  other
than for  reasons  set forth in (i) above,  then the costs and  expenses of such
recall as well as any reasonable  attorneys' fees related to such  determination
shall be borne by  Metrika.  Each party shall  maintain  complete  and  accurate
records of all products  manufactured or sold by it for such periods as required
by law.  Nothing in this  Section 5.7 shall be  construed to modify or limit any
legal obligation of either party with respect to any recall.

                  5.8  CORRECTIVE   ACTION.   If  any  government   agency  with
jurisdiction  shall request or order any  corrective  action with respect to any
Critical Reagent, or NTx/Digital Response Devices,  including but not limited to
any recall, customer notice, restriction, change, market action, or modification
of the product in question, and the cause or basis for such corrective action is
primarily attributable to a condition, fact, or action that constitutes a breach
by a party of any of its  warranties,  representations  or  covenants  contained
herein,  then such party shall be liable for and shall reimburse the other party
for all costs incurred as a result of such action, including replacement cost of
any product affected thereby.






         6.  TRANSFER OF STOCK.  On the Effective  Date,  Ostex shall assign and
transfer to Metrika 40,000 shares of Metrika stock in accordance  with the terms
and  conditions  of the Stock  Transfer  Agreement by and between the parties of
even date herewith.  In addition,  Ostex agrees to fully vest and register under
applicable  securities laws the 70,633 shares of Ostex stock owned by Metrika as
of the  effective  date on the  earlier of: (i) the date CLIA Waiver is obtained
for the NTx/Digital Response Device or (ii) two (2) years from April 10, 1997 in
accordance  with the terms and  conditions  of the  Amendment No. 1 to the Stock
Purchase Agreement by and between the parties of even date herewith.

         7. STANDOFF  PERIOD.  In the event that Metrika makes an initial public
offering of Metrika  stock  ('IPO'),  Ostex  acknowledges  that pursuant to that
certain Fourth Amended and Restated  Investor's  Rights  Agreement  dated May 7,
1998,  among  Metrika,  Ostex and certain  other  shareholders  of Metrika named
therein,  Ostex  has  agreed  to a 180  day  standoff  period  beginning  on the
effective  date of the IPO  before  Ostex  sells any  shares of  Metrika  stock,
provided that the underwriters of such IPO request such a standoff period of all
such shareholders.

         8. OWNERSHIP OF  DISCOVERIES.  It is the intent of the parties that the
ownership of any and all Discoveries  resulting from this Agreement,  regardless
of  inventorship,  shall:  (a)  vest  solely  in  Ostex  if such  rights  relate
exclusively  to the NTx Assay  Technology;  (b) vest  solely in  Metrika if such
rights relate  exclusively to the MODM  Technology  and/or the Digital  Response
Device; and (c) in all other cases vest in the party or parties of the inventor.

         9.       CONFIDENTIALITY.

                  9.1.  OBLIGATION  NOT TO  DISCLOSE  CONFIDENTIAL  INFORMATION.
Recipient  shall not at any time,  and shall  cause its  permitted  assigns  and
sublicensees  to  commit  not to at any  time for a period  of seven  (7)  years
following the termination of this Agreement, disclose or otherwise make known or
available to any person, firm, corporation, or other entity other than Discloser
any  Confidential  Information  received from the Discloser  without the express
prior  written  consent  of  that   Discloser.   With  respect  to  Confidential
Information  developed  under  this  Agreement  and  which  is not  Confidential
Information  of one party only,  neither party shall  disclose or otherwise make
such  Confidential   Information  known  or  available  to  any  person,   firm,
corporation,  or other entity  without the express prior written  consent of the
other party, not to be unreasonably withheld or delayed. Recipient shall utilize
reasonable procedures to safeguard Confidential Information, including releasing
Confidential  Information only to those employees and legal  representatives  to
whom  disclosure is necessary or appropriate  for the Recipient to undertake its
responsibility pursuant to this Agreement.  Notwithstanding the above, Recipient
may   disclose   Confidential   Information   of  Discloser  to  (i)  its  legal
representatives,   prospective   investors,   (so  long  a  such  disclosure  of
Confidential  Information  is limited to the existence of this Agreement and its
basic terms and conditions),  permitted assigns and contract manufacturers under
conditions as to assure the confidential  treatment thereof by such persons, and
(ii) as required by law or to comply with applicable governmental regulations or
court orders.






NOTE: CONFIDENTIAL TREATMENT REQUESTED.

                  9.2 RECIPIENT'S OWN USE OF CONFIDENTIAL INFORMATION. Recipient
shall not make any use, directly or indirectly,  of any Confidential Information
of the  Discloser  except in the  ordinary  course of business  pursuant to this
Agreement or any other specific,  written  agreement  entered into between Ostex
and Metrika.

                  9.3 SPECIFIC  PERFORMANCE.  The parties  acknowledge that: (a)
the  covenants  set forth in this  Section  9 are  essential  to the  activities
contemplated  by this  Agreement;  (b) but for the  agreement  of each  party to
comply  with  such  covenants,  neither  party  would  have  entered  into  such
activities;  (c) each party has  consulted  with or has had the  opportunity  to
consult  with  counsel  and has been  advised  in all  respects  concerning  the
reasonableness of such covenants as to time and scope; (d) Discloser may have no
adequate  remedy at law if  Recipient  violates  or fails to perform  under this
Section 9; and (e)  Discloser  shall have the right,  in  addition  to any other
rights it may have, to seek from a court of competent  jurisdiction  preliminary
and permanent  injunctive  relief to restrain any breach or threatened breach or
otherwise to specifically  enforce Recipient's  obligations under this Section 9
if Recipient fails to perform in accordance herewith.

         10.      TERM AND TERMINATION.

                  10.1 INITIAL  LICENSE TERM.  This  Agreement  shall be in full
force and effect commencing on the Effective Date and, unless earlier terminated
in accordance  with this Section 10, shall remain in effect for XXXXX after CLIA
Waiver is received (the 'Initial Term'); provided,  however, on XXXXX after CLIA
Waiver,  if requested by a party, the parties agree to negotiate in good faith a
renewal term of this Agreement  ('Renewal Term'),  under terms that are mutually
agreed  upon by both  parties.  The Initial  Term and any Renewal  Term shall be
collectively referred to as 'Term'.

                  10.2  TERMINATION FOR BREACH.  Except for termination by Ostex
pursuant  to Section  3.2,  in the event  either  party  shall  have  materially
breached or defaulted in the performance of a material obligation hereunder, the
non-breaching  party may  terminate  this  Agreement  by  written  notice to the
breaching  party stating in reasonable  detail the alleged breach and its intent
to terminate this Agreement if such breach is not cured within  forty-five  (45)
days from the  receipt of such notice by the  breaching  party.  This  Agreement
shall  terminate if such  material  breach is not cured by the  breaching  party
within such forty-five (45) day period.  Without  limiting the generality of the
foregoing,  a 'material  breach' or 'failure to perform'  shall include  without
limitation,  any material  failure to remit payments,  or failure to comply with
any financial  reporting  requirement,  or material  failure to maintain Ostex's
rights pursuant to the WRF/Ostex Exclusive License Agreement.

                  10.3  BANKRUPTCY OF A PARTY.  Either party may terminate  this
Agreement and the rights granted hereunder, effective upon giving written notice
of such  termination  to the other  party,  if such other party  enters into any
proceeding,  whether voluntary or otherwise, in bankruptcy,  reorganization,  or
arrangement  for the  appointment of a receiver or trustee to take possession of
such other party's assets or any other  proceeding  under any law for the relief
of creditors, or makes an assignment for the benefit of creditors.







                  10.4     RIGHTS AND DUTIES UPON TERMINATION.

                           10.4.1   PAYMENTS.  Upon  termination of this 
     Agreement,  each party shall pay to the other all payments that are due and
have accrued and are outstanding as of the date of termination.

                           10.4.2   RETURN OF  MATERIALS.  Within  thirty  
     (30) days  following  termination  of this  Agreement,  each  party  having
possession of or control over any  Confidential  Information  of the other party
shall  return to such other party all written and  otherwise  recorded or stored
matter containing such Confidential  Information,  including all original matter
and all copies thereof; provided, however, that each party's legal department or
outside  counsel  may retain  one copy of the  Confidential  Information  in its
confidentially   maintained  files,   solely  for  the  purpose  of  identifying
information  to  be  protected   pursuant  to  any   applicable   non-disclosure
obligation.

                           10.4.3   NTX/DIGITAL  RESPONSE  DEVICES  REMAINING. 
     Upon  termination  of this  Agreement,  Ostex  shall have the right to sell
NTx/Digital   Response  Devices  then  remaining  in  its  possession  within  a
reasonable time after termination hereof.

                           10.4.4   SURVIVAL OF TERMS.  Notwithstanding  any 
other  provision  herein to the contrary,
Sections 1, 4.3, , 4.4.7,  5.6, 5.7,  5.8, 6, 7, 8, 9, 10.4,  11, 13, 15, 16, 18
and 20 of this Agreement  shall survive any  termination  or expiration  hereof.
Except as set forth herein,  all rights,  duties and  obligations of the parties
hereunder shall terminate upon the termination or expiration of this Agreement.

                           10.4.5   EFFECT  OF  DISPUTED  BREACH.  In the  
event of any  disputed  breach  under  this
Agreement,  except for termination by Ostex pursuant to Section 3.2,  running of
the time period in which a party must cure a breach of this  Agreement  shall be
suspended as to the matter of the dispute pending an arbitration decision that a
breach has in fact occurred;  PROVIDED that during such suspension,  one hundred
fifty  percent  (150%)  of any  amount  in  dispute  shall  be  placed  into  an
interest-bearing  escrow  account,  and  upon  resolution  of the  dispute,  the
substantially  prevailing  party shall be  entitled to be paid (1) the  disputed
amount,  plus (2)  interest  thereon  during the  suspension  at the rate of ten
percent (10%) per annum, plus (3) its attorneys' fees relating to the dispute.

         11.      REPRESENTATIONS.  WARRANTIES AND INDEMNITIES.

                  11.1 BY OSTEX.  Ostex  represents  and  warrants to Metrika as
follows:

                           11.1.1   ORGANIZATION   AND  AUTHORITY.   As  of  the
Effective Date of the Agreement, Ostex is
a corporation  duly organized,  validly  existing and in good standing under the
laws of the State of  Washington,  USA, has all  requisite  corporate  power and
authority to carry on its business and perform its obligations hereunder, and is




                           duly  qualified  to do  business  in any of those 
 jurisdictions  in the  United  States of
America  where failure to qualify  could have a material  adverse  effect on its
ability to perform its obligations hereunder. The execution and delivery of this
Agreement by Ostex, and the performance of the obligations of Ostex contemplated
hereby,  have been duly and validly  authorized by all necessary legal action on
its part,  and this  Agreement  is legal,  valid and  binding  against  Ostex in
accordance with its terms.  Except as have been or will be obtained by Ostex, no
permit, consent, approval or authorization of; or declaration to or filing with,
any person,  party or governmental or regulatory  authority of the United States
is required in connection with the delivery,  consummation and/or performance by
Ostex of this Agreement.

                           11.1.2   OSTEX PATENT  RIGHTS AND OSTEX  KNOW-HOW.
 During the Term:  (a) Ostex will either
have or will procure  (including  taking any required licenses under third party
Intellectual  Property  Rights  at its sole  expense,  including  any  necessary
royalty  payments) all rights necessary for Metrika to enjoy the rights to Ostex
Intellectual  Property  Rights  granted in Section  2.1; (b) Ostex will take all
necessary  actions to maintain all Ostex  Patent  Rights  commensurate  with the
license  grant in  Section  2.1 in full  force and  effect,  and (c) Ostex  will
maintain the WRF/Ostex  Exclusive License Agreement in full force and effect and
will be  responsible  for any and all license fees and royalties  payable to WRF
thereunder.

                           11.1.3   NO DEFAULT.  The  execution,  delivery and 
 performance of this Agreement by Ostex
does not and shall not  conflict  with,  result in a breach of; or  constitute a
default under (with or without the giving of notice,  or the passage of time, or
both),  any  agreement or instrument to which Ostex is a party or by which it is
bound.

                           11.1.4   OSTEX'S  DISCLAIMER OF OTHER WARRANTIES.  
     Ostex disclaims all implied  warranties,  including without  limitation any
warranty of merchantability or fitness for a particular purpose.

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT,  OSTEX MAKES NO REPRESENTATIONS
AND EXTENDS NO WARRANTIES OF ANY KIND,  EITHER EXPRESS OR IMPLIED,  INCLUDING NO
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

                  11.2     BY METRIKA.  Metrika represents and warrants to 
Ostex as follows:

                           11.2.1   ORGANIZATION  AND AUTHORITY.  As of the 
Effective  Date of the Agreement,  Metrika
is duly  organized,  validly  existing  and in good  standing  under the laws of
California,  USA and has all  requisite  power  and  authority  to  carry on its
business and the performance of its obligations hereunder, and is duly qualified
to do business in any of those jurisdictions where failure to qualify could have
a material  adverse effect on its ability to perform its obligations  hereunder.
The execution and delivery of this Agreement by Metrika,  and the performance of
the obligations  contemplated  hereby,  have been duly and validly authorized by
all necessary  legal action on its part, and this Agreement is legal,  valid and
binding  against  Metrika in accordance  with its terms.  Except as have been or
will be obtained by Metrika, no permit,  consent,  approval or authorization of;
or  declaration  to or  filing  with,  any  person,  party  or  governmental  or
regulatory  authority  having  jurisdiction  is required in connection  with the
delivery, consummation and/or performance of this Agreement.






                           11.2.2   METRIKA  PATENT  RIGHTS.  During the Term: 
 (a)  Metrika  will either have or will
procure  (including taking any required licenses under third party  Intellectual
Property Rights at its sole expense,  including any necessary  royalty payments)
all rights  necessary  for Ostex to enjoy the rights to  Metrika  Patent  Rights
granted in Section  2.2;  and (b)  Metrika  will take all  necessary  actions to
maintain  all Metrika  Patent  Rights  commensurate  with the  license  grant in
Section 2.2 in full force and effect.

                           11.2.3   NO DEFAULT.  The execution,  delivery and 
performance of this Agreement by Metrika
does not and shall not  conflict  with,  result in a breach of; or  constitute a
default under (with or without the giving of notice,  or the passage of time, or
both), any agreement or instrument to which Metrika is a party or by which it is
bound.

                           11.2.4   METRIKA'S   DISCLAIMER  OF  OTHER  
     WARRANTIES.  Metrika  disclaims all implied  warranties,  including without
limitation any warranty of merchantability or fitness for a particular purpose.

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT,  OSTEX MAKES NO REPRESENTATIONS
AND EXTENDS NO WARRANTIES OF ANY KIND,  EITHER EXPRESS OR IMPLIED,  INCLUDING NO
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE

                  11.3 U.S.  FOREIGN  CORRUPT  PRACTICES  ACT.  Each party shall
indemnify, defend and hold the other party, its subsidiaries and Affiliates, and
the directors,  officers, employees and agents of any of them, harmless from and
against all and any claims,  proceedings,  losses,  fines,  expenses  (including
without  limitation  reasonable  attorneys  fees  and  expenses)  and  penalties
incurred by said party arising out of any Prohibited  Practice committed by said
party or any of its officers, directors, shareholders, employees, or agents.

         For  purposes of this Section  11.3,  the  following  shall be deemed a
'Prohibited Practice';  the offer, payment,  promise to pay, or authorization of
the paying of any money, or the offer, giving,  promise to give or authorization
of the giving of anything of value to any officer or employee of any  government
or any department, agency or instrumentality thereof; or any person acting in an
official capacity for or on behalf of any such government, department, agency or
instrumentality,  or any political party or official  thereof;  or any candidate
for political office, or any intermediary for any such persons or party, in each
case for purposes of (a)  influencing any act or decision of any such persons or
party in their or its  official  capacity,  or (b)  inducing  any such person or
party to do or omit to do any act in violation of the lawful duty of such person
or party, or (c) inducing any such person or party to use their or its influence
with any government or instrumentality thereof to affect or influence any act or
decision of any such  government or  instrumentality,  in each case (a), (b) and
(c) in order to assist the  applicable  party  hereto in  obtaining or retaining
business  for,  or with,  or  directing  business  to,  any  person or entity in
violation of the U.S. Foreign Corrupt Practices Act.

                  11.4     GOVERNMENTAL COMPLIANCE.  Each party shall obtain 
     and   maintain   all   required   licenses,   permits,   certificates   and
authorizations  needed to perform its  obligations  under this Agreement for the
effectiveness of this Agreement in all




                  jurisdictions  where said party  operates,  for the import and
for the  export of the  NTx/Digital  Response  Devices,  and for the  marketing,
distribution and Sale of the NTx/Digital Response Devices. Metrika will hold and
solely own all regulatory approvals for the NTx/Digital Response Device.

         12.  THIRD-PARTY  INFRINGEMENT.  If, during the Term of this Agreement,
either party becomes aware that one or more third parties are  infringing or are
threatening  to infringe the Ostex Patent Rights or the Metrika  Patent  Rights,
said party (the 'Notifying Party') shall immediately  provide to the other party
all details in said party's  knowledge  or  possession  concerning  the kind and
character of the  infringement  and any other  pertinent  information  that said
party may have.

         13.      DEFENSE OF THIRD-PARTY CLAIMS.

                  13.1 METRIKA DEFENSE OF THIRD-PARTY  CLAIMS AND INDEMNITY.  To
the extent that any claim,  suit,  or other legal  proceeding  is  threatened or
commenced against Ostex or WRF that is founded on an allegation that the Digital
Response Device or MODM Technology as incorporated into the NTx/Digital Response
Device  infringes any trade secret,  patent,  or copyright  belonging to a third
party,  Ostex will give Metrika prompt  written notice of such legal  proceeding
and Metrika may elect to assume sole control of the defense to or  settlement of
such  dispute.  Ostex  shall  cooperate  fully  with  Metrika  in  any  defense,
settlement  or  compromise  made by  Metrika.  Ostex  shall not  enter  into any
settlement  agreement or other voluntary  resolution of any such claim, suit, or
other  legal  proceeding  without  obtaining  Metrika's  prior  written  consent
thereto.  If Ostex has  complied  fully  with the  procedures  set forth in this
Section  13.1,  Metrika will  indemnify and hold Ostex and WRF harmless from and
against  any  loss,  cost,  damage,  or  other  expenses,  including  reasonable
attorneys'  fees,  incurred by Ostex and WRF as a result of such claim,  suit or
legal  proceeding.  If a final injunction is obtained against Ostex's  marketing
and sale of the NTx/Digital  Response  Devices,  or if in the opinion of Metrika
the subject  NTx/Digital  Response Devices are likely to become the subject of a
successful  claim of infringement,  Metrika may, at its option and expense,  (i)
procure for Ostex the right to continue its  performance  under this  Agreement,
(ii)  replace or modify the  NTx/Digital  Response  Devices so that they  become
non-infringing,  or  (iii) if  neither  (i) or (ii)  are  reasonably  available,
terminate  this  Agreement  without  further   obligation  or  liability.   This
indemnification provision shall not apply and Metrika shall have no liability to
the extent that the  NTx/Digital  Response  Device has been modified or tampered
with in any way without the express written consent of Metrika,  or if Ostex has
any interest in the claim, suit or other legal proceeding, or any license to any
right so asserted.

13.2 OSTEX DEFENSE OF THIRD-PARTY  CLAIMS AND INDEMNITY.  To the extent that any
claim,  suit,  or other legal  proceeding  is  threatened  or commenced  against
Metrika  that is  founded  on an  allegation  that the NTx Assay  Technology  or
Critical  Reagents  as used in the  NTx/Digital  Response  Device  or use of the
NTx/Digital  Response Device  specifically to assay NTx in urine,  infringes any
trade secret, patent, or copyright belonging to a third




party,  Metrika will give Ostex prompt written  notice of such legal  proceeding
and Ostex may elect to assume sole  control of the defense to or  settlement  of
such  dispute.  Metrika  shall  cooperate  fully  with  Ostex  in  any  defense,
settlement or compromise made by Ostex. Metrika shall not enter into any

                  settlement agreement or other voluntary resolution of any such
claim,  suit, or other legal proceeding  without obtaining Ostex's prior written
consent thereto.  If Metrika has complied fully with the procedures set forth in
this Section  13.2,  Ostex will  indemnify  and hold Metrika  harmless  from and
against  any  loss,  cost,  damage,  or  other  expenses  including   reasonable
attorneys'  fees  incurred by Metrika as a result of such  claim,  suit or legal
proceeding.  If a final injunction is obtained against  Metrika's use of the NTx
Assay Technology or Critical Reagents in the NTx/Digital  Response Device, or if
in the opinion of Ostex the NTx Assay Technology or Critical Reagents are likely
to become the subject of a successful claim of  infringement,  Ostex may, at its
option and expense,  (i) procure for Metrika the right to continue using the NTx
Assay  Technology  or  Critical  Reagents  in  accordance  with  terms  of  this
Agreement,  (ii) replace or modify the NTx Assay Technology or Critical Reagents
so that it (they)  becomes  non-infringing,  or (iii) if neither (i) or (ii) are
reasonably available, accept return of the Critical Reagents held by Metrika and
its  designated  manufacturer(s)  in  inventory,  and terminate  this  Agreement
without further obligation or liability.  This  indemnification  provision shall
not  apply  and Ostex  shall  have no  liability  to the  extent  that NTx Assay
Technology  or Critical  Reagents have been modified or tampered with in any way
without the express  written consent of Ostex, or if Metrika has any interest in
the  claim,  suit or other  legal  proceeding,  or any  license  to any right so
asserted.

                  13.3 SHARED DEFENSE OF THIRD-PARTY CLAIMS. With respect to any
claim, suit or other legal proceeding threatened or commenced against Metrika or
Ostex  that  is  founded,  in  whole  or in  part,  on an  allegation  that  the
NTx/Digital  Response  Device  infringes any trade  secret,  patent or copyright
belonging to a third party,  which claim,  suit or other legal proceeding is not
covered by the  provisions  of Section 13.1 or 13.2 above,  the parties agree to
share control of the defense or settlement of such claim and shall share equally
all  costs  and  liabilities  resulting  from such  claim,  suit or other  legal
proceeding.

         14.      USE OF TRADEMARKS AND TRADE NAMES.

                  14.1 RESTRICTED  RIGHTS TO USE. No provision of this Agreement
shall be interpreted  or construed as conferring  upon either party any right to
use in labeling, advertising,  marketing, publicizing or otherwise promoting the
NTx/Digital  Response  Device,  any  name,  trade  name,  trademark,   or  other
designation  (or  derivation  thereof) of the other  party  hereto or WRF or the
University of Washington, except as expressly provided under this Section 14.

                  14.2  USE OF NAMES  AND  MARKS IN  LABELING.  The  NTx/Digital
Response Device shall be sold under  tradenames  and/or  trademarks  selected by
Ostex; provided, however, that each NTx/Digital Response Device shall be labeled
with: (i) a Metrika trademark selected by Metrika ('Metrika Trademark') and (ii)
a statement  identifying that such NTx/Digital  Response Device was manufactured
by Metrika for exclusive distribution by Ostex ('Identifying Statement') both in
sizes and locations mutually  agreeable to the parties.  Metrika shall also have
the right to review and  approve  all claims  relating  to the  intended  use of
NTx/Digital Response Devices contained in




                  package  inserts  and  other  promotional   materials,   which
approval shall not be  unreasonably  withheld.  Metrika hereby grants to Ostex a
non-transferable,  non-exclusive  license,  concurrent  with  the  Term  of this
Agreement,  to use such Identifying  Statement and Metrika  Trademark solely for
the  purposes set forth  herein.  Neither  party shall use any  trademark of the
other party with respect to products not covered by this  Agreement.  Each party
shall have the right to review and approve the use of its marks in any  proposed
product  literature,  advertising  material or material for publication.  In the
event that any action or proceeding is initiated against Metrika,  Ostex, or any
other licensee or distributor of Ostex in any country  alleging that any Metrika
Trademark  infringes the  trademark  rights of the third party  initiating  such
action or proceeding,  Ostex may continue to market NTx/Digital Response Devices
within such country  without said Metrika  Trademark  affixed  thereto (but with
such other trademark as Metrika may reasonably  specify)  pending  resolution of
the dispute as to trademark rights.

                  14.3 TRADEMARK  REGISTRATION.  Ostex shall be responsible  for
the  registration,  maintenance  and  enforcement  of its own  trade  names  and
trademarks for the NTx/Digital  Response Product.  Each party shall from time to
time, and in any event upon the issuance of additional registrations, modify its
use of trademarks to incorporate  proper notice of registration and other claims
of right,  in accordance  with the laws and customs of the various  countries in
which it operates pursuant to this Agreement.

         15.      ASSIGNMENT AND SUBLICENSE.

                  15.1 BY  METRIKA.  Except as  specifically  permitted  by this
Agreement,  Metrika  shall not  assign,  sublicense,  delegate,  or in any other
manner transfer any of its rights, privileges,  obligations or duties under this
Agreement to any third party without the prior written  consent of Ostex,  which
consent may be withheld in Ostex's sole and absolute  discretion,  provided that
this  provision  shall  not  apply  to any  merger,  consolidation,  or  sale of
substantially all of the assets of Metrika, or any third-party  acquisition of a
majority of the business  interests or voting  shares of Metrika,  provided that
the surviving party shall within a reasonable period following the final closing
of such  transaction,  expressly agree in writing to be bound by this agreement.
Any attempt by Metrika to assign, sublicense, delegate or otherwise transfer any
right,  privilege,  obligation  or  duty  under  this  Agreement  other  than in
accordance with this Section 15 shall be void and shall, at the option of Ostex,
be cause for immediate  termination of this  Agreement and all licenses  granted
hereunder.

                  15.2  BY  OSTEX.  Except  as  specifically  permitted  by this
Agreement, Ostex shall not assign, sublicense,  delegate, or in any other manner
transfer  any of its  rights,  privileges,  obligations  or  duties  under  this
Agreement to any third party without the prior written consent of Metrika, which
consent may be withheld in Metrika's sole and absolute discretion, provided that
this  provision  shall  not  apply  to any  merger,  consolidation,  or  sale of
substantially  all of the assets of Ostex, or any  third-party  acquisition of a
majority of the business interests or voting shares of Ostex,  provided that the
surviving party shall within a reasonable  period following the final closing of
such transaction,  expressly agree in writing to be bound by this agreement. Any
attempt by Ostex to assign,  sublicense,  delegate  or  otherwise  transfer  any
right,  privilege,  obligation  or  duty  under  this  Agreement  other  than in
accordance  with  this  Section  15 shall be void and  shall,  at the  option of
Metrika,  be cause for immediate  termination of this Agreement and all licenses
granted hereunder.






         16.      ARBITRATION.

                  16.1  AGREEMENT  TO SETTLE  DISPUTES  BY  ARBITRATION.  At the
request  through  notice of either Ostex or Metrika,  any  controversy  or claim
arising  between the parties and related to or arising out of the  construction,
interpretation, or enforcement of any term or condition of this Agreement or any
transaction  hereunder  (including  the decision to enter into this  Agreement),
which  controversy or claim cannot first be settled amicably between the parties
(including  without  limitation  through  utilization of  third-party  mediation
agreed to by both parties), shall be submitted to arbitration.  Such arbitration
shall be conducted in Seattle,  Washington,  if initiated by Metrika,  or in San
Francisco,  California,  if  initiated  by Ostex,  and in either  case  shall be
conducted in accordance  with the applicable  Rules of the American  Arbitration
Association in effect on the date of such controversy or claim.

                  16.2 APPOINTMENT OF ARBITRATORS. Within thirty (30) days after
the  delivery  pursuant  to  Section  16.1  above of a  notice  of  request  for
arbitration,  Metrika and Ostex shall each appoint one independent  person as an
arbitrator to hear and determine the dispute. The two persons so chosen shall by
agreement select a third,  impartial arbitrator,  which selection shall be final
and  conclusive  upon both parties.  Each  arbitrator  shall be  experienced  in
international and domestic manufacturing and distribution of products similar to
the  NTx/Digital  Response  Device.  If  either  party  fails to  designate  its
arbitrator  within sixty (60) days after the notice of  arbitration is received,
then the arbitrator designated by the one party shall act as the sole arbitrator
and shall be deemed to be the single,  mutually  approved  arbitrator to resolve
the dispute.

                  16.3 ARBITRATORS'  POWERS.  The arbitrators shall have all the
powers  of a State or  Federal  Court  located  at the site of the  arbitration,
including the power to order specific enforcement of this Agreement and to order
the  production  of  relevant  and  non-privileged  documents  by one  party for
inspection and duplication by the other party prior to the arbitration  hearing;
provided,  however,  that the arbitrators  shall be bound by this Agreement with
regard to the restriction on consequential,  incidental, and punitive damages as
set forth in this Agreement.

                  16.4  DISCOVERY.  The  arbitrators  prior to the hearing shall
grant  discovery  pursuant  to the  intendment  of the  Federal  Rules  of Civil
Procedure,  and  as  the  arbitrators  determine  to be  appropriate  under  the
circumstances.

                  16.5 PROTECTIVE  ORDER. In the event of arbitration and at the
request of either Ostex or Metrika, in order to protect Confidential Information
and any other  matter  that  either  party  would  normally  not reveal to third
parties,  the  arbitrators  shall enter a  protective  order in such form as the
parties shall stipulate or as the arbitrators shall determine is suitable. Among
other  things,  the  protective  order  shall  stipulate  that  the  arbitrators
themselves  shall  receive  any  information   designated  by  either  party  as
'confidential'  solely for purposes of assessing  the facts and law for purposes
of the arbitration,  and shall not otherwise use or disclose such matter. At the
request of either




                  party,  the  protective  order shall be entered as an award of
the arbitration  panel and shall enable either party to obtain the assistance of
a court of competent  jurisdiction to enter equitable decrees or other relief to
enforce the provisions of the order as if it had been entered by that court.

                  16.6 EFFECT OF DECISION. The decision of the arbitrators shall
state the reason for the award and shall be final,  binding and conclusive  upon
the parties.  The parties shall comply with such decision in good faith as if it
were a final  decision of a court.  Judgment  upon the award shall be entered in
any court of  competent  jurisdiction.  Any award  made in  connection  with any
arbitration shall be made in U.S. Dollars.

                  16.7 RIGHTS OF THIRD PARTIES. Notwithstanding the agreement to
arbitrate any dispute between Ostex and Metrika, in the event that a controversy
or claim between Ostex and Metrika  involves an  adjudication of the rights of a
third party,  and that third party does not agree to submit to  arbitration  and
would under Rule 19(a) of the Federal Rules of Civil Procedure,  if feasible, be
joined as an  indispensable  party,  then the  dispute  shall be brought to, and
determined by, a court of the competent jurisdiction.

                  16.8 INTERIM  RELIEF.  Upon the application of either party to
this  Agreement,  and  whether or not an  arbitration,  mediation  or attempt to
settle amicably has yet been initiated,  all courts having jurisdiction over one
or more of the  parties are  authorized  to: (i) issue and enforce in any lawful
manner such temporary  restraining  orders,  preliminary  injunctions  and other
interim  measures  of relief as may be  necessary  to prevent  harm to a party's
interests  or  as  otherwise  may  be  appropriate  pending  the  conclusion  of
arbitration  proceedings pursuant to this Agreement;  and (ii) enter and enforce
in any lawful manner such  judgments for  permanent  equitable  relief as may be
necessary  to  prevent  harm  to a  party's  interests  or as  otherwise  may be
appropriate   following  the  issuance  of  arbitral  awards  pursuant  to  this
Agreement.

         17.  PUBLICITY.  No party shall announce or publicize this Agreement or
any terms  thereof  without the  advance  written  consent of the others  (which
approval  shall not be  unreasonably  withheld),  provided that either party may
disclose the existence of this Agreement and such terms of this Agreement to its
prospective  investors  and as may be required by law or by  regulations  of any
governmental agency.

         18.   RESPONSIBILITY   FOR  CLAIMS.  In  order  to  distribute  between
themselves the responsibility for the handling and expense of claims arising out
of the manufacture,  distribution,  Sale or use of NTx/Digital Response Devices,
the parties agree as follows:

                  18.1 OSTEX LIABILITY.  Ostex shall defend,  indemnify and hold
harmless  Metrika  against any  liability  or damages  from any  claims,  suits,
proceedings,  demands, recoveries or expenses ('Claims') to the extent that such
Claims  arises from or is based upon:  (i) defects in the  NTx/Digital  Response
Device to the extent that such defects are due to the Critical  Reagents sold by
Ostex or NTx Assay Technology  licensed by Ostex pursuant to this Agreement;  or
(ii) product claims or selling  efforts whether written or oral, made or alleged
to be made, by Ostex in its advertising, publicity, promotion, or




                  Sale of the  NTx/Digital  Response  Device  where such product
claims or selling  efforts  were not  approved by  Metrika;  (iii) any breach by
Ostex of any of its representations or warranties  contained herein; or (iv) any
negligent or  intentionally  wrongful  acts or omissions on the part of Ostex or
its  Subdistributors;  provided that  Metrika:  (a) promptly  notifies  Ostex in
writing of any such Claim  which  comes to its  attention;  (b) allows  Ostex to
control the  defense or  settlement  of such Claim;  (c) does not enter into any
settlement  or compromise  of such Claim  without the express  authorization  of
Ostex;  and (d) reasonably  cooperates  with Ostex in the defense of such Claim,
subject to Ostex's payment of all expenses  associated with such  cooperation by
Metrika.  Metrika  shall  have the  right to  participate  in a  non-controlling
fashion in such legal proceeding at its sole expense.

                  18.2 METRIKA LIABILITY.  Metrika shall be liable for and shall
indemnify  and hold Ostex  harmless  against any  liability  or damages from any
Claims to the extent that such Claims arises from or is based upon:  (i) defects
in the  NTx/Digital  Response Device (other than to the extent that such defects
are due to the Critical Reagents or NTx Assay Technology); or (ii) any breach by
Metrika of any of its  representations  or warranties  contained herein or (iii)
any negligent or intentionally wrongful acts or omissions on the part of Metrika
or its designated  manufacturer(s);  provided that Ostex: (a) promptly  notifies
Metrika in writing of any such Claim  which comes to its  attention;  (b) allows
Metrika to control the defense or settlement  of such Claim;  (c) does not enter
into  any   settlement   or   compromise  of  such  Claim  without  the  express
authorization  of Metrika;  and (d)  reasonably  cooperates  with Metrika in the
defense of such Claim,  subject to Metrika's payment of all expenses  associated
with such  cooperation by Ostex.  Ostex shall have the right to participate in a
non-controlling fashion in such legal proceeding at its sole expense.

         18.3  CONSEQUENTIAL,  INCIDENTAL  AND PUNITIVE  DAMAGES.  NEITHER PARTY
SHALL BE LIABLE TO THE OTHER PARTY FOR ANY SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
PUNITIVE DAMAGES THAT MAY ARISE OUT OF THIS AGREEMENT (INCLUDING BUT NOT LIMITED
TO DAMAGES FOR LOSS OF SALES, POTENTIAL SALES, PROFITS OR BUSINESS),  OTHER THAN
PURSUANT TO ITS  OBLIGATIONS  UNDER  SECTIONS 9, 13.1,  13.2,  18.1,  18.2 OR AS
OTHERWISE EXPRESSLY PROVIDED IN THIS AGREEMENT, REGARDLESS OF WHETHER SUCH OTHER
PARTY HAS BEEN INFORMED OF THE POSSIBILITY THAT SUCH DAMAGES MAY OCCUR.

         19. NOTICE. Any notice given in regard to this Agreement shall be given
in writing and shall be  delivered  personally,  or shall be sent by first class
mail or registered certified mail, postage, and charges prepaid, to:

                  if to Ostex:

                           Ostex International, Inc.
                           2203 Airport Way South
                           Suite 400
                           Seattle, Washington  98134
                           Attention:  President









                  Copy to:

                                    Perkins Coie LLP
                                    1201 Third Avenue, 40th Floor
                                    Seattle, WA 98101
                                    Attn:  James R. Lisbakken

                  if to Metrika:

                           Metrika, Inc.
                           510 Oakmead Parkway
                           Sunnyvale, California  94086
                           Attention CEO

                  Copy to: Venture Law Group
                                    2800 Sand Hill Road
                                    Menlo Park, California  94025
                                    Attn:  Michael Hall

Any notice so given shall be  effective  upon the date of actual  receipt by the
addressee as evidenced by return receipt or other written  confirmation.  Either
party may by advance  notice  given  pursuant  to this  Section 19  designate  a
substitute address for receipt of future notices.

         20.  GOVERNING  LAW.  All  claims or  controversies  asserted  by Ostex
against  Metrika shall be construed and enforced in accordance  with the laws of
California.  Any judicial action by Ostex relating to the  relationship  between
the parties pursuant to this Agreement, or goods purchased or licensed hereunder
(together  with any  counterclaims  asserted by  Metrika),  shall be brought and
tried in the State or  Federal  Courts  located  in  California.  All  claims or
controversies  asserted by Metrika against Ostex shall be construed and enforced
in accordance  with the laws of the State of Washington.  Any judicial action by
Metrika  relating  to the  relationship  between  the  parties  pursuant to this
Agreement,   or  goods  purchased  or  licensed  hereunder  (together  with  any
counterclaims  asserted  by Ostex),  shall be brought  and tried in the State or
Federal  Courts  located  in  the  State  of  Washington.   Notwithstanding  the
foregoing,  interpretation and enforcement of the provisions of Section 16 shall
be governed by and construed in accordance with the Federal Arbitration Act.

         21.  INTEGRATION AND TERMINATION OF CO-MARKETING  AGREEMENT.  It is the
desire and intent of the parties to provide  certainty as to their future rights
and  undertakings  herein.  The parties in this Agreement have  incorporated all
representations,  warranties, covenants, commitments and understandings on which
they have relied in entering into this (i)  Agreement;  (ii) the Stock  Transfer
Agreement (referred to in Section 6 above); and (iii) the Amendment No. 1 to the
Stock  Purchase  Agreement  (referred to in Section 6 above),  and neither party
makes any covenant or other commitment to the other




         concerning its future action. Accordingly, this (i) Agreement; (ii) the
Stock  Transfer  Agreement  (referred  to in  Section  6  above);  and (iii) the
Amendment No. 1 to the Stock Purchase Agreement (referred to in Section 6 above)
(i) constitutes the entire agreement and  understanding  between the parties and
there are no promises, representations,  conditions, provisions or terms related
thereto  other  than  those  contained  in (i) this  Agreement;  (ii) the  Stock
Transfer Agreement (referred to in Section 6 above); and (iii) the Amendment No.
1 to the Stock  Purchase  Agreement  (referred to in Section 6 above),  and (ii)
supersedes all previous undertakings,  agreements and representation between the
parties,  written  or oral,  with  respect  to the  subject  matter  hereof.  No
modification of; addition to, or waiver of any provisions of this (i) Agreement;
(ii) the Stock Transfer  Agreement  (referred to in Section 6 above);  and (iii)
the Amendment No. 1 to the Stock  Purchase  Agreement  (referred to in Section 6
above) shall be binding  upon either  party  hereto  unless the same shall be in
writing  duly  executed  by a duly  authorized  representative  of both  parties
hereto.  The parties agree that the Co-Marketing  Agreement is hereby terminated
and  superseded in its entirety by (i) this  Agreement;  (ii) the Stock Transfer
Agreement (referred to in Section 6 above); and (iii) the Amendment No. 1 to the
Stock Purchase Agreement (referred to in Section 6 above).

         22.   MODIFICATION.   No   modification  to  this  Agreement  shall  be
enforceable unless made in writing and signed by an authorized representative of
each party.

         23. SEVERABILITY.  In the event that any provision of this Agreement is
determined to be invalid or unenforceable  for any reason,  such provision shall
be deemed  inoperative only to the extent that it violates or conflicts with law
or public policy and shall be deemed modified to the extent necessary to conform
thereto, and all other provisions hereof shall remain in full force and effect.

         24.  WAIVER.  No express or implied waiver by either party of any right
or remedy with  respect to a default by the other party under any  provision  of
this  Agreement  shall be deemed,  interpreted  or  construed as a waiver of any
right or remedy with  respect to any other  default  under the same or any other
provision hereof.

         25.  SUCCESSORS AND ASSIGNS.  This Agreement  shall be binding upon and
shall inure to the benefit of the parties'  respective  successors  and assigns,
subject to the restrictions on assignment set forth in Section 15 above.

         26. STANDSTILL  PROVISION.  During the Term of this Agreement,  Metrika
shall  not make any offer  for,  and shall  not  actually  acquire  any legal or
beneficial interest in the common stock or other securities of Ostex without the
prior written  consent of Ostex's Board of Directors  other than with respect to
such interests already held by Metrika prior to the date hereof, and Ostex shall
not make any offer for, and shall not actually  acquire any legal or  beneficial
interest in the common  stock or other  securities  of Metrika,  other than with
respect to such interests  already held by Ostex or its Affiliates  prior to the
date hereof,  without the prior written consent of Metrika's Board of Directors.
The  parties  each  agree  that any  violation  of this  provision  would  cause
irreparable harm to the other party. The parties each agree that the other party
shall be entitled to all equitable remedies available to it to prevent violation
of this provision, as well as all other legal remedies, and if successful in any
claim,  may recover from the violating party all reasonable  costs and attorneys
fees expended by it in seeking such remedy.






         27.  INDEPENDENT  CONTRACTOR.  The  relationship  of Metrika  and Ostex
established by this Agreement is that of  independent  contractors,  and nothing
contained  in this  Agreement  shall be  construed  to (i) give either party the
power to  direct  or  control  the  day-to-day  activities  of the  other,  (ii)
constitute the parties as partners,  joint venturers,  co-owners or otherwise as
participates in a joint or common undertaking,  or (iii) allow a party to create
or  assume  any  obligation  on  behalf  of the  other  party  for  any  purpose
whatsoever.

         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
agreement the day and year last written below.

         DATED AND EFFECTIVE as of the date first written above.


     METRIKA, INC.                      OSTEX INTERNATIONAL, INC.

     By:  /S/ MICHAEL P. ALLEN          By:  /S/ THOMAS A. BOLOGNA
         ---------------------              -----------------------
     Name:  Michael P. Allen            Name:  Thomas A. Bologna

     Title:  President and CEO          Title:  President & CEO

         Date:  June 8, 1998            Date: June 11, 1998






NOTE: CONFIDENTIAL TREATMENT REQUESTED.

                                    EXHIBIT A

                 SPECIFICATIONS FOR NTX/DIGITAL RESPONSE DEVICE

1.0      TIME TO RESULT
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

2.0      SAMPLE TYPES
         XXXXXXXXXXXXXXXXXXXXXXXXX

3.0      SAMPLE STORAGE
         Samples  can be  stored  for  XXXXXXXXXXXXXXXXXXXXXXXXX,  or  subjected
         XXXXXXXXXXXXXXXX adversely affecting assay results.

4.0      SAMPLE VOLUME
         For 510(k)  clearance,  the device will operate  with a minimum  sample
         volume XXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

5.0      DEVICE ORIENTATION
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

6.0      CALIBRATION
         There will be no calibration  required by the user. Each device will be
         factory  calibrated.  The  calibration  will be valid until the labeled
         expiration date.

7.0      STABILITY
         7.1      SHELF LIFE
                  7.0.1    Definition:   Shelf  life  is  defined  as  the  time
                           interval  from the  date of  manufacture  to  product
                           expiration.

                  7.0.2    Minimum acceptable shelf life:

                           Non-CLIA waived Product Sales:  XXXXXXX

                           XXXXX of CLIA waived Product Sales:  XXXXXXXXX
                           XXXXX of CLIA waived Product Sales:  XXXXX
                           XXXXX of CLIA waived Product Sales:  XXXXX





NOTE: CONFIDENTIAL TREATMENT REQUESTED.

         7.2      OPEN PACKAGE LIFE
                  XXXXXXXXXXXX conditions specified in 8.1 and 8.2.


8.0      OPERATING ENVIRONMENT
         8.1      TEMPERATURE
                  XXXXXXXXXX

         8.2      HUMIDITY
                  XXXXXXXXXX

         8.3      AMBIENT LIGHT
                  The device will not be adversely affected by ambient light.

         8.4        STORAGE AND SHIPPING CONDITIONS
                  8.4.1    Storage Condition
                           PRIOR TO CLIA WAIVER, acceptable product storage 
                           conditions will be:  Refrigerated
                           XXXXXXXXX
                           AT THE TIME OF CLIA WAIVER, acceptable product 
                           storage conditions will be:  Room
                           Temperature XXXXXXXXX

                  8.4.2    Shipping Condition
                           PRIOR TO CLIA WAIVER, acceptable product shipping 
                           conditions will be:  Refrigerated
                           XXXXXXXXXXXXX
                           AT THE TIME OF CLIA WAIVER, acceptable product 
                           shipping conditions will be:  Ambient

9.0      ACCURACY (MAXIMUM ALLOWABLE BIAS FROM REFERENCE)
         9.1      NTx:  XXX

         9.2      Creatinine:  XXX

10.0     PRECISION (TOTAL CLINICAL)
         10.1     NTX
                  XXXXXXX
                  XXXXXXX

         10.2     CREATININE
                  For 510(k) clearance:  XXXXXXXX
                  Within XXXXX after CLIA waiver: XXXXXXX

11.0     ASSAY RANGE
         11.1     NTX
                  For 510(k) clearance:  XXXXXXXXXXX
                  Within XXXXX after CLIA waiver:  XXXXXXXX





NOTE: CONFIDENTIAL TREATMENT REQUESTED.

         11.2     CREATININE
                  For 510(k) clearance:  XXXXXXXXXX
                  Within XXXXXX after CLIA waiver:  XXXXXXXXXX

12.0     INTERFERING SUBSTANCES
         12.1     NTX
                  XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                  XXXXXXXXXXXXXXXXXXXXXXXXXXXXX

         12.2     CREATININE
                  XXXXXXXXXXXXXXXXXXXXXXXXXX

13.0     RELIABILITY
         13.1     ERROR CONDITIONS
                  XXXXXXXXXXXXXXXXXXXXXXXX
                  XXXXXXXXXXXXXXXXXXXXXXXX

         13.2     MISUSE (PRODUCT LAUNCH)
                  XXXXXXXXXXXXXXXXXXXXXXXXXXXX

         13.3     FUNCTIONAL RELIABILITY
                  The functional  reliability  goal for released  products is as
follows:

                  XXXXX of Product Sales
                      XXXXX                              XXXXX
                      XXXXX                              XXXXX
                  XXXXX of Product Sales                      XXXXX
                  XXXXX of Product Sales                      XXXXX

                  This excludes all failures from improper use by the user.





NOTE: CONFIDENTIAL TREATMENT REQUESTED.

                                    EXHIBIT B

                  METRIKA AND OSTEX PRE-LAUNCH RESPONSIBILITIES


A. XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
     XXXXXXXXXXXXXXXXXXXXXXXXXXX
     XXXXXXXXXXXXXXXXXXXXXXXXXX

B.  XXXXXXXXXXXXXXXXXXXXXXXX
     XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
     XXXXXXXXXXXXXXXXXXXXXXXXXXXXX.  The lot  configuration  components  
     which  comprise a clinical  lot,  and  production  staging  with respect to
clinical         trials        is         completed         at         Metrika's
discretion.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

C.  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
     XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
     XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

D.   Ostex,  at their  discretion,  can conduct a  pre-commercialization  launch
     audit which includes QA, QC, manufacturing and product performance. Metrika
     agrees to assist in these audits. Test devices associated with these audits
     will be paid for by Ostex and be  included  in the non CLIA or CLIA  waived
     purchases noted in Exhibit D.

E.  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX






NOTE: CONFIDENTIAL TREATMENT REQUESTED.

                                    EXHIBIT C

                      SPECIFICATIONS FOR CRITICAL REAGENTS


                               SPECIFICATION SHEET



XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXX

         XXXXXXXXXX
                  XXXXXXXXXXXXXXXXXXXXX
                  XXXXXXXXXXXXXXXXXXXXX

         XXXXXXXXXX
                  XXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXX






NOTE: CONFIDENTIAL TREATMENT REQUESTED.

TITLE                 LOT NO.     DOC NO.           REV               PAGE
NTX CONCENTRATE                    2007             G                 23 OF 24




                             ---- ATTACHMENT 3 ----
                                  QC DATA SHEET
                                                                          
- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
                    Volume      NTx nmol/mL    NTx Total      Protein        Protein        Specific
                    (mL)        BCE step 8.1   nmoles (=      mg/mL step     Total mg (=    Activity =
                                               vol (mL) *     8.3            protein        ([OBJECT
                                               nmol/mL BCE)                  (mg/mL) *      OMITTED])
                                                                             Vol (mL))
- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
7.3.4 XXXXX         Step 7.3.3

- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
7.10 XXXXX          Step 7.9

- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
7.22 XXXXX          Step 7.20

- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------
7.28 XXXXX          Step 7.27
- ------------------- ----------- -------------- -------------- -------------- -------------- ----------------



Total nanomole yield = Tot nm step 7.3.4/tot nm step 7.28 x 100 =        %
                                                                  -------

QC Materials Used:
Osteomark(R)kit PN 9005 or 9006 LN      , calibrator diluent PN 2022 LN   
                                   -----                                --
PBS PN 2003 LN             , Gold 300 pmol/mL NTx from PN 4010 LN 336C04
               ------------

(A)  Assay 1, Dilution 1                    (D)  Assay 2, Dilution 1
(B)  Assay 1, Dilution 2                    (E)  Assay 2, Dilution 2
(C)  Avg. of (A) and (B)                    F)  Avg. of (D) and (E)
(G)  Percent  Difference  of (C) and (F) (If (G) > 20%,  repeat  steps  8.1.3 to
8.1.5) (H) Average of (A),  (B),  (D) and (E)  (Record  (H) in the table  above)
Note:  Percent  difference  between  x  and  y =  100  *  (absolute  value  (x -
y)/(average (x, y))

Number of aliquots:
Volume per aliquot:
Total volume to inventory:
Total nanomoles BCE to inventory:
Expiration Date:
Initials:
Checked By:
Date:

==================================================================

QC Analyst Signature:                                                  Date:
Record Reviewed By:                                                    Date:
                                    Quality Control
Record Reviewed By:                                                    Date:
                                    Quality Assurance
                             Released: Not Released:








TITLE                    LOT NO.    DOC NO.           REV               PAGE
QUALIFICATION OF GOLD                0019              B                 1 - 6
REFERENCE CALIBRATORS

                                   TEST METHOD

- --------------------------------------------------------------------

DOCUMENT CONTROL HISTORY:

CHANGE REQUEST NUMBER            REVISION     DATE             PROOFED BY
ECO 0554                         A            01/27/97          C. Smith
         New
ECO 0563                         B
         Change Gold Reference Lot


















- ------------------------------------------------------------------------

DOCUMENT APPROVAL

Quality Assurance         Manufacturing                      Development

SANDY JOHNSTONE            CORY SMITH                         JEFF MORGAN

Date:    01/27/97          Date:    01/20/97         Date:    01/23/97

- ---------------------------------------------------------------------------

     This  document  contains   proprietary   information  which  shall  not  be
reproduced,  transferred  to other  documents,  disclosed  to  others,  used for
manufacturing  or any other purpose  without  document  control  approval and/or
prior written permission of Ostex International, Inc.




NOTE: CONFIDENTIAL TREATMENT REQUESTED.

1.0      PURPOSE

         The  purpose  of  this  document  is to  establish  a test  method  for
qualifying gold reference calibrators.


2.0      APPLICABILITY

         2.1      4011     NTx Calibrator Panel
         2.2      P083     Assignment of Expiration Dates


3.0      HEALTH AND SAFETY INFORMATION

         Osteomark(R)  calibrators contain material derived from human bone. The
         bone has been  thoroughly  processed  and the donor has been tested and
         found  negative  for  Hepatitis  B Surface  Antigen and  antibody  HIV.
         However, no known test can offer absolute assurance that human products
         will not transmit Hepatitis, HIV, or other viruses.


4.0      MATERIALS/EQUIPMENT

         4.1      XXXXXXXXXXXXXXX
         4.2      All material needed to run the Osteomark(R)EIA kit, as per 
                   the Osteomark(R)instructional insert (PN
                  7002).
         4.3      Gold Calibrators, Lot 058-144.
         4.4      XXXXXXXXXXXXXX
         4.5      Caps, XXXXXXXXXXXXXXXX.  Same number as vials above.
         4.6      Labels, blank.  Need to fit on the vials in 4.4, XXXXX.


5.0      OTHER INFORMATION

         5.1      Shelf life:  XXXXXXXXXXXXXX.
         5.2      Storage conditions:  XXXXXXXXXXXXXX.
         5.3      Unit of measure:  ea.





6.0      PROCEDURE

         6.1      Select a set of 1, 30, 100, 300, 1000, and 3000 nM calibrators
                  which come from the same part number 4011 lot,  and which have
                  passed the quality  control  procedure in document  4011.  The
                  calibrators  must be from a lot  which  did  not  undergo  any
                  adjustments after being diluted from the 3000 nM calibrator.

         6.2      If  the  calibrators  are  not  already  filled,  aliquot  the
                  calibrators  into 0.5 mL  volumes in  polypropylene  vials (PN
                  1093) with polypropylene caps (PN 1090).  Record the procedure
                  used  and  lot  numbers  of  all  materials  in  a  laboratory
                  notebook. Assign the calibrators a lot number corresponding to
                  the  notebook  number  and page.  If the  calibrators  are not
                  already labeled, label each vial as gold calibrator,  and with
                  lot number, concentration, and expiration date.

         6.3      Run  an  assay   following   the  method   specified   in  the
                  Osteomark(R)  instructional  insert,  PN 7002.  Use previously
                  released and matched  components except for calibrators.  Gold
                  Calibrators (Ref) and the Calibrators being tested (Test) will
                  be used instead of kit  calibrators.  Use the following  plate
                  map.  (Note:  Test  wells  and Ref wells  are  reversed  every
                  strip).  This  assay is to be run at least  three  and no more
                  than four times for each calibrator (count valid assays only).

         1     2    3    4   5     6    7    8    9   10    11   12
          1nm        30nm     100nm     300nm     1000bnm     3000 nm
A        Test Ref   Test Ref  Test Ref  Test Ref  Test Ref  Test Ref
B        Ref  Test  Ref  Test Ref  Test Ref  Test Ref  Test Ref  Test
C        Test Ref   Test Ref  Test Ref  Test Ref  Test Ref  Test Ref
D        Ref  Test  Ref  Test Ref  Test Ref  Test Ref  Test Ref  Test
E        Test Ref   Test Ref  Test Ref  Test Ref  Test Ref  Test Ref
F        Ref  Test  Ref  Test Ref  Test Ref  Test Ref  Test Ref  Test
G        Test Ref   Test Ref  Test Ref  Test Ref  Test Ref  Test Ref
H        Ref  Test  Ref  Test Ref  Test Ref  Test Ref  Test Ref  Test




NOTE: CONFIDENTIAL TREATMENT REQUESTED.

7.0      ACCEPTANCE CRITERIA

         7.1      For each assay,  calculate the  coefficient of variance (% CV)
                  of the eight OD replicates of 'Test' wells and the 'Ref' wells
                  for each calibrator. The assay is valid for that calibrator if
                  the % CV is less than or equal XXXXXXX.

         7.2      For each assay,  determine  the Test/Ref  ratio (T/R) for each
                  calibrator.  Divide  the  mean  Test  OD  result  by the  mean
                  Reference OD result.

         7.3      a)       A calibrator passes acceptance criteria if the 
                       Test/Ref ratio is XXXXXX for all three
                  assays.

                  b)       A  calibrator  fails   acceptance   criteria  if  the
                           Test/Ref ratio falls XXXXX for two or more assays.

                  c)       If a calibrator has a test/reference ratio XXXXXX.

         7.4      Calculate  the  average   Test/Ref   ratio  for  the  3000  nM
                  calibrator  using all valid results from step 6.3. The average
                  Test/Ref ratio passes acceptance criteria if it is XXXXXX.

         7.5      The calibrator set will be accepted as gold if all calibrators
                  in the set pass acceptance criteria in steps 7.3 and 7.4.

         7.6      If the  calibrator  set is accepted as gold,  initiate  ECO of
                  Document  4011 and Test  Method  0019 to refer to the new gold
                  lot. File the results in the QA files under Gold  Calibrators.
                  Label the container  holding the calibrators with description,
                  lot number, concentration and expiration date.
                  XXXXXXXXXXX.





         The following plate map will be required for testing calibrators 
per step 7.3c.

        1       2        3        4
        Calibrator 1     Calibrator 2
A        Test Ref        Test Ref
B        Ref  Test       Ref  Test
C        Test Ref        Test Ref 
D        Ref  Test       Ref  Test
E        Test Ref        Test Ref 
F        Ref  Test       Ref  Test
G        Test Ref        Test Ref 
H        Ref  Test       Ref  Test






NOTE: CONFIDENTIAL TREATMENT REQUESTED.

                                  QC DATA SHEET
Assay IDs: _________________________________
Reference kit lot number: _____ Gold Calibrator Panel lot number: ____________
Attach a print-out for all raw OD data and curve calculations and results.

                     1 nm   30nm   100nm   300nm   1000nm  3000nm
Test % CV            
                     ----   ----   ----     ----    -----   ----
Ref % CV
                     ----   ----   ----     ----    -----   ----
Test/Ref
                     ----   ----   ----     ----    -----   ----
Asasy 1 Pass/Fail
                     ----   ----   ----     ----    -----   ----
Test % CV            
                     ----   ----   ----     ----    -----   ----
Ref % CV
                     ----   ----   ----     ----    -----   ----
Test/Ref
                     ----   ----   ----     ----    -----   ----
Asasy 2 Pass/Fail
                     ----   ----   ----     ----    -----   ----
Test % CV            
                     ----   ----   ----     ----    -----   ----
Ref % CV
                     ----   ----   ----     ----    -----   ----
Test/Ref
                     ----   ----   ----     ----    -----   ----
Asasy 3 Pass/Fail
                     ----   ----   ----     ----    -----   ----
Test % CV            
                     ----   ----   ----     ----    -----   ----
Ref % CV
                     ----   ----   ----     ----    -----   ----
Test/Ref
                     ----   ----   ----     ----    -----   ----
Asasy 4 Pass/Fail
                     ----   ----   ----     ----    -----   ----
        Pass/Fail 
                     ----   ----   ----     ----    -----   ----
Validity criteria  XXXX.  Acceptance Criteria for 1,30,100,300,1000
and 3000 nm calibrators: XXXXXXXXXXXXX
Average 3000 nm  Test/Ref :
     Avg. Pass/Fail       :

Acceptance Criteria for 3000 nm average:  XXXXXXXXXXX


COMMENTS




- -------------------------------------------------------------------------
Record reviewed by: ____________________             _________
                           Quality Control           Date
                           Released _________        Not Released _________

Record reviewed by: ____________________                       _________
                    ------------------------
                           Quality Assurance         Date
                           Released _________        Not Released _________






NOTE: CONFIDENTIAL TREATMENT REQUESTED.


                                    EXHIBIT D

                             MINIMUMS AND PRICE LIST





- --------------------------------- ----------------------- -------------- --------------------------- ------------
                                     MINIMUM VOLUMES (2)    PRICE ($)       PRICE ABOVE MINIMUM      SHELF LIFE
                                                                                  VOLUMES  (3)
                                  -----------------------                ---------------------------
Phase/Year                         Per Month   Per 12      at Minimum        Volume      Price ($)    (months)
                                               Month         Volumes     (units above
                                                Period                   minimum)
                                                                                   
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------
Non CLIA waived (1)                  XXXX        XXXX         XXXX            XXXX          XXXX        XXXX
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------
XXXX CLIA Waived Total               XXXX        XXXX
      XXXXX                          XXXX        XXXX         XXXX            XXXX          XXXX        XXXX
      XXXXX                          XXXX        XXXX         XXXX            XXXX          XXXX        XXXX
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------
XXXX CLIA waived                     XXXX        XXXX         XXXX            XXXX          XXXX        XXXX
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------
XXXX CLIA waived                     XXXX        XXXX         XXXX            XXXX          XXXX        XXXX
- --------------------------------- ------------ ---------- -------------- --------------- ----------- ------------


(1) In the event that CLIA waiver  occurs  before  XXXXX,  the Minimum  Volumes 
     and associated transfer Price obligations for Ostex will shift to the XXXXX
CLIA Waived Volumes and transfer  Prices  immediately  upon Ostex being provided
with CLIA waiver documentation by Metrika.

(2)  Minimum unit volume per month  increases are contingent upon attaining 
     both the above noted CLIA waived status and shelf life  specifications,  as
well as the product specifications in Exhibit A.

(3)  For  twelve-month  periods  where the unit volume is greater than the 
     number of units noted as Minimum  Volumes,  regardless  of shelf life,  any
additional units purchased by Ostex during that  twelve-month  period will be at
the prices indicated in the 'Price Above Minimum' column.