CORNING CLINICAL LABORATORIES INC
10-12B/A, 1996-11-26
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                      SECURITIES AND EXCHANGE COMMISSION 

                            Washington, D.C. 20549 


                                  Form 10/A 
   
                          Amendment No. 4 to Form 10 
    


                 General Form For Registration of Securities 
                     Pursuant to Section 12(b) or (g) of 
                     the Securities Exchange Act of 1934 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
            (Exact name of registrant as specified in its charter) 

<TABLE>
<CAPTION>
 <S>                                             <C>
                    Delaware                            16-1387862 

 ----------------------------------------------- ------------------------- 
        (State or other jurisdiction of              (I.R.S. Employer 
          incorporation or organization)            Identification No.) 
               One Malcolm Avenue 
              Teterboro, New Jersey                        07608 

 ----------------------------------------------- ------------------------- 
    (Address of principal executive offices)            (Zip Code) 



                               201 393 5000 
             --------------------------------------------------
            (Registrant's telephone number, including area code) 

</TABLE>

Securities to be registered pursuant to Section 12(b) of the Act: 

<TABLE>
<CAPTION>
            <S>                                 <C>
            Title of each class                 Name of each exchange on which 
             to be so registered                each class is to be registered 

   Common Stock, with attached Preferred            New York Stock Exchange 
             Stock Purchase Right 

</TABLE>


Securities to be registered pursuant to Section 12(g) of the Act: 

                                     None 
- --------------------------------------------------------------------------------
                               (Title of class) 

<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 

INTRODUCTION 


   
This Registration Statement on Form 10 relates to the registration under the 
Securities Exchange Act of 1934, as amended, of the common stock, with 
attached Preferred Stock Purchase Right, of the Registrant which is being 
issued as described in the Information Statement (the "Information Statement"),
dated November 26, 1996, of Corning Incorporated. Selected pages of the 
Information Statement which are related to the Registrant and the securities 
being registered hereunder (the "Quest Diagnostics Information") are attached 
hereto as Exhibit 99.1 and are incorporated herein by reference in answer to 
the items of this Registration Statement set forth below. 
    


Item 1. Business 

The information required by this item is contained under the sections" Risk 
Factors--Risks Relating to Quest Diagnostics," "Business of Quest 
Diagnostics" and "The Relationship Among Corning, Quest Diagnostics and 
Covance After the Distributions" of the Quest Diagnostics Information and 
such sections are incorporated herein by reference. 

Item 2. Financial Information 

The information required by this item is contained under the sections 
"Capitalization of Quest Diagnostics," "Pro Forma Financial Information of 
Quest Diagnostics," "Selected Historical Financial Data of Quest Diagnostics" 
and "Management's Discussion and Analysis of Financial Condition and Results 
of Operations of Quest Diagnostics" of the Quest Diagnostics Information and 
such sections are incorporated herein by reference. 

Item 3. Properties 

The information required by this item is contained under the section 
"Business of Quest Diagnostics-- Properties" of the Quest Diagnostics 
Information and such section is incorporated herein by reference. 

Item 4. Security Ownership of Certain Beneficial Owners and Management 

The information required by this item is contained under the section 
"Security Ownership of Certain Beneficial Owners and Management of Quest 
Diagnostics" of the Quest Diagnostics Information and such section is 
incorporated herein by reference. 

Item 5. Directors and Executive Officers 

The information required by this item is contained under the section 
"Management of Quest Diagnostics" of the Quest Diagnostics Information and 
such section is incorporated herein by reference. 

Item 6. Executive Compensation 

The information required by this item is contained under the section 
"Management of Quest Diagnostics" of the Quest Diagnostics Information and 
such section is incorporated herein by reference. 

Item 7. Certain Relationships and Related Transactions 

The information required by this item is contained under the section 
"Management of Quest Diagnostics" of the Quest Diagnostics Information and 
such section is incorporated herein by reference. 

Item 8. Legal Proceedings 

The information required by this item is contained under the sections 
"Business of Quest Diagnostics-- Government Investigations and Related 
Claims" and "--Legal Proceedings" of the Quest Diagnostics Information and 
such sections are incorporated herein by reference. 

Item 9. Market Price of and Dividends on the Registrant's Common Equity and 
        Related Stockholder Matters 

The information required by this item is contained under the sections "Risk 
Factors--Risks Relating to Quest Diagnostics--Absence of Dividends; 
Restrictions Imposed on Dividends by the Indenture and the Quest Diagnostics 
Credit Facility," "Risk Factors--Risks Relating to Quest Diagnostics--Absence 
of Prior Public 

                                      2 
<PAGE> 

Market," "Risk Factors--Risks Relating to Quest Diagnostics--Potential 
Volatility of Stock Price," "Description of Quest Diagnostics Capital 
Stock--Quest Diagnostics Common Stock--Dividend Policy," "--Quest Diagnostics 
Common Stock--Listing and Trading" and "Management of Quest Diagnostics" of 
the Quest Diagnostics Information and such sections are incorporated herein 
by reference. 

Item 10. Recent Sales of Unregistered Securities 

Not applicable. 

Item 11. Description of Registrant's Securities to be Registered 

The information required by this item is contained under the sections 
"Description of Quest Diagnostics Capital Stock" and "Antitakeover Effects of 
Certain Provisions of the Quest Diagnostics Certificate of Incorporation and 
By-Laws" of the Quest Diagnostics Information and such sections are 
incorporated herein by reference. 

Item 12. Indemnification of Directors and Officers 

The information required by this item is contained under the section 
"Liability and Indemnification of Directors and Officers of Quest 
Diagnostics" of the Quest Diagnostics Information and such section is 
incorporated herein by reference. 

Item 13. Financial Statements and Supplementary Data 

   
The information required by this item is contained under the sections
"Capitalization of Quest Diagnostics," "Pro Forma Financial Information of Quest
Diagnostics," "Selected Historical Financial Data of Quest Diagnostics,"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations of Quest Diagnostics" and "Financial Statements of Corning Clinical
Laboratories Inc. (to be renamed Quest Diagnostics Incorporated)" of the Quest
Diagnostics Information and such sections are incorporated herein by reference.
    

Item 14. Changes in and Disagreements with Accountants on Accounting and 
Financial Disclosure 

Not applicable. 

Item 15. Financial Statements and Exhibits 

(a) Financial Statements 

   
   The information required by this item is contained under the section
"Financial Statements of Corning Clinical Laboratories Inc. (to be renamed Quest
Diagnostics Incorporated" of the Quest Diagnostics Information)" and such
section is incorporated herein by reference.
    

   (b) Exhibits 

                                      3 
<PAGE> 
   
<TABLE>
<CAPTION>

Exhibit 
 Number     Description 
- -------     ----------- 
<S>         <C>
2.1*        Form of Transaction Agreement among Corning Incorporated, Corning Life Sciences Inc., Corning 
            Clinical Laboratories Inc. (Delaware), Covance Inc. and Corning Clinical Laboratories Inc. 
            (Michigan), dated November 22, 1996 

3.1*        Certificate of Incorporation of the Registrant 

3.2*        By-Laws of the Registrant 

4.1*        Form of Common Stock certificate 

4.2*        Form of Rights Agreement between Corning Clinical Laboratories Inc. and Harris Trust and Savings 
            Bank, dated December 31, 1996 

10.1*       Form of Tax Sharing Agreement among Corning Incorporated, Corning Clinical Laboratories Inc. and 
            Covance Inc., dated [      ], 1996 

10.2*       Form of Spin-Off Tax Indemnification Agreement between Corning Incorporated and Corning Clinical 
            Laboratories Inc. dated, [      ], 1996 

10.3*       Form of Spin-Off Tax Indemnification Agreement between Corning Clinical Laboratories Inc. and 
            Covance Inc., dated [      ], 1996 

10.4*       Form of Credit Agreement among Corning Clinical Laboratories Inc., Morgan Guaranty Trust Company 
            of New York, Nationsbank, N.A. and Wachovia Bank of Georgia, N.A., dated [        ], 1996 

10.5*       Form of Spin-Off Tax Indemnification Agreement between Covance Inc. and Corning Clinical 
            Laboratories Inc., dated [           ], 1996 

10.6*       Form of Corning Clinical Laboratories Inc. Employees Stock Purchase Plan 

10.7*       Form of Corning Clinical Laboratories Inc. Variable Compensation Plan 

10.8*       Form of Corning Clinical Laboratories Inc. Profit Sharing Plan 

10.9*       Form of Corning Clinical Laboratories Inc. Employee Equity Participation Program 

10.10*      Form of Corning Clinical Laboratories Inc. Executive Retirement Supplemental Plan 

10.11*      Form of Corning Clinical Laboratories Inc. Directors' Restricted Stock Plan 

10.12*      Form of Employment Agreement between Kenneth W. Freeman and Corning Clinical Laboratories Inc. 

21*         Subsidiaries of the Registrant 

27*         Financial Data Schedules 

99.1        Selected pages of the Information Statement of Corning Incorporated
            dated November 26, 1996 (pages 2; 29-108; F-1-F-32) 
</TABLE>

- ------------- 
* Previously filed. 
    
                                      4 
<PAGE> 

                                   SIGNATURES

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 
1934, the registrant has duly caused this amendment to the registration 
statement to be signed on its behalf by the undersigned, thereunto duly 
authorized. 



                                        CORNING CLINICAL LABORATORIES INC.


Dated: November 26, 1996                By: /s/ Kenneth W. Freeman 
                                        ----------------------------------------
                                            Kenneth W. Freeman, President 
                                            and Chief Executive Officer 


                                      5 



                              TABLE OF CONTENTS 
<TABLE>
<CAPTION>
                                                                              Page 
                                                                             ------- 
<S>                                                                          <C>
THE RELATIONSHIP AMONG CORNING, QUEST DIAGNOSTICS AND COVANCE AFTER THE 
DISTRIBUTIONS                                                                   29 
QUEST DIAGNOSTICS INCORPORATED 
  RISK FACTORS                                                                  33 
  CAPITALIZATION OF QUEST DIAGNOSTICS                                           39 
  SELECTED HISTORICAL FINANCIAL DATA OF QUEST DIAGNOSTICS                       40 
  PRO FORMA FINANCIAL INFORMATION OF QUEST DIAGNOSTICS                          44 
  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS 
   OF OPERATIONS OF QUEST DIAGNOSTICS                                           51 
  BUSINESS OF QUEST DIAGNOSTICS                                                 60 
  MANAGEMENT OF QUEST DIAGNOSTICS                                               83 
  SECURITY OWNERSHIP BY CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF QUEST 
   DIAGNOSTICS                                                                  93 
  DESCRIPTION OF QUEST DIAGNOSTICS CAPITAL STOCK                                95 
  ANTITAKEOVER EFFECTS OF CERTAIN PROVISIONS OF THE QUEST DIAGNOSTICS 
  CERTIFICATE OF INCORPORATION AND BY-LAWS                                     101 
  DESCRIPTION OF CERTAIN INDEBTEDNESS OF QUEST DIAGNOSTICS                     105 
  LIABILITY AND INDEMNIFICATION OF DIRECTORS AND OFFICERS OF QUEST 
   DIAGNOSTICS                                                                 108 
INDEX TO FINANCIAL STATEMENTS                                                  F-1 
</TABLE>



                                      2 
<PAGE> 

        THE RELATIONSHIP AMONG CORNING, QUEST DIAGNOSTICS AND COVANCE 
                           AFTER THE DISTRIBUTIONS 

   After the Distributions, Quest Diagnostics Incorporated ("Quest 
Diagnostics") and Covance Inc. ("Covance") will be independent public 
companies and Corning Incorporated ("Corning") will not have any ownership 
interest in either Quest Diagnostics or Covance other than shares of Quest 
Diagnostics' voting cumulative preferred stock. Corning, Quest Diagnostics 
and Covance will enter into certain agreements, summarized below, to provide 
for an orderly transition to the status of three separate independent 
companies, to govern their relationship subsequent to the Distributions and 
to provide for the allocation of tax and certain other liabilities and 
obligations arising from periods prior to the Distributions. Copies of the 
forms of such agreements have been filed as exhibits to the Registration 
Statements of which this Information Statement is a part. The following 
description summarizes the material terms of such agreements, but is 
qualified by reference to the texts of such agreements as filed. 

Transaction Agreement 

   Corning, Quest Diagnostics and Covance will enter into the Transaction 
Agreement (the "Transaction Agreement") providing for, among other things, 
certain conditions precedent to the Distributions, certain corporate 
transactions required to effect the Distributions and other arrangements 
between Corning, Quest Diagnostics and Covance subsequent to the 
Distributions. See "The Distributions--Conditions; Termination." 

   The Transaction Agreement will provide for, among other things, 
assumptions of liabilities and cross- indemnities designed to allocate 
generally, effective as of the Distribution Date, financial responsibility 
for the liabilities arising out of or in connection with (i) the clinical 
laboratory business to Quest Diagnostics and its subsidiaries, (ii) the 
contract research business to Covance and its subsidiaries and (iii) all 
other business conducted by Corning prior to the Distribution Date to Corning 
and its subsidiaries other than Quest Diagnostics and Covance. 

   The Transaction Agreement will provide that Corning, Quest Diagnostics and 
Covance will use their respective commercially reasonable efforts to achieve 
an allocation of consolidated indebtedness of Corning and a capital structure 
that reflects the capital structure after the Distributions of Corning, Quest 
Diagnostics and Covance as contemplated in the discussion under 
"Capitalization of Quest Diagnostics" and "Capitalization of Covance." In 
addition to the specific indemnity described below, Corning, Quest 
Diagnostics and Covance are obligated under the Transaction Agreement to 
indemnify and hold harmless each other in respect of Indemnifiable Losses (as 
defined therein) arising out of or otherwise relating to the management or 
conduct of their respective businesses or the breach of any provision of the 
Transaction Agreement; provided, however, that Quest Diagnostics will have no 
obligation to indemnify or hold harmless Corning in respect of Indemnifiable 
Losses arising out of any governmental claims or investigations described in 
the next paragraph. 


   As discussed under "Business of Quest Diagnostics--Government 
Investigations and Related Claims," Quest Diagnostics is subject to several 
governmental investigations. Any amounts paid by Quest Diagnostics to settle 
these investigations, or as a result of a judgment relating to these 
investigations, will be indemnified by Corning under the Transaction 
Agreement. Under the Transaction Agreement Corning will agree to indemnify 
Quest Diagnostics against all monetary penalties, fines or settlements 
arising out of any governmental criminal, civil or administrative 
investigations or claims that have been settled prior to or are pending as of 
the Distribution Date, pursuant to service of subpoena or other notice of 
such investigation to Quest Diagnostics, as well as any qui tam proceeding 
for which a complaint was filed prior to the Distribution Date whether or not 
Quest Diagnostics has been served with such complaint or otherwise been 
notified of the pendency of such action, to the extent that such 
investigations or claims arise out of or are related to alleged violations of 
federal fraud and health care statutes identified in the Transaction 
Agreement by reason of Quest Diagnostics or any company acquired by Quest 
Diagnostics billing any federal program or agency for services rendered to 
beneficiaries of such program or agency. Corning will also indemnify Quest 
Diagnostics for 50% of the aggregate of all judgment or settlement payments 
made by Quest Diagnostics that are in excess of $42.0 million in respect of 
claims by private parties (i.e., nongovernmental parties such as private 
insurers) that relate to indemnified or previously settled governmental 
claims and that allege overbillings by Quest Diagnostics or any existing 
subsidiaries of Quest Diagnostics for services provided prior to the 
Distribution Date; provided, however, such indemnification for private claims 
will terminate five years after the Distribution Date (whether or not 
settled) and will not exceed $25.0 million in the aggregate (reduced by 
certain tax benefits as described below). Quest Diagnostics' aggregate 
reserve with respect to all governmental and private claims, including 
litigation costs, was $215 million at September 30, 1996 and is estimated to 
be reduced to $85 million at the Distribution Date as a result of the payment 
of settled claims, primarily the Damon settlement of $119 million. 


                                      29 
<PAGE> 

   Corning will not indemnify Quest Diagnostics against any governmental 
claims that arise after the Distribution Date, even though relating to events 
prior to the Distribution Date, or to any private claims that do not relate 
to the indemnified or previously settled governmental claims or 
investigations or investigations that relate to post- Distribution Date 
billings. Corning will not indemnify Quest Diagnostics against consequential 
or incidental damages relating to the billing claims, including losses of 
revenues and profits as a consequence of any exclusion from participation in 
federal or state health care programs or the fees and expenses of the 
litigation, including attorneys' fees and expenses. All amounts indemnified 
against by Corning for the benefit of Quest Diagnostics will be calculated on 
a net after-tax basis by taking into account any deductions and other tax 
benefits realized by Quest Diagnostics (or a consolidated group of which 
Quest Diagnostics is a member after the Distributions (the "Quest Diagnostics 
Group")) in respect of the underlying settlement, judgment payment, or other 
loss (or portion thereof) indemnified against by Corning generally at the 
time and to the extent such deductions or tax benefits are deemed to reduce 
the tax liability of Quest Diagnostics or the Quest Diagnostics Group under 
the Transaction Agreement. 

   The Transaction Agreement provides that, in the case of any claims for 
which Corning, Quest Diagnostics or Covance are entitled to indemnification, 
the indemnified party will control the defense of any claim unless the 
indemnifying party elects to assume such defense. However, in the case of all 
private claims related to indemnified governmental claims related to alleged 
overbillings, Quest Diagnostics will control the defense. Disputes under the 
Transaction Agreement are subject to binding arbitration. The Transaction 
Agreement will also provide that, except as otherwise set forth therein or in 
any other agreement, all costs or expenses incurred on or prior to the 
Distribution Date in connection with the Distributions will be allocated 
among the parties. Except as set forth in the Transaction Agreement or any 
related agreement, each party shall bear its own costs and expenses incurred 
after the Distribution Date. 

Spin-Off Tax Indemnification Agreements 

   Corning and Quest Diagnostics will enter into a tax indemnification 
agreement (the "Corning/Quest Diagnostics Spin-Off Tax Indemnification 
Agreement") pursuant to which (1) Quest Diagnostics will represent to Corning 
that, to the best of its knowledge, the materials relating to Quest 
Diagnostics submitted to the Internal Revenue Service ("IRS") in connection 
with the request for ruling submitted to the IRS are complete and accurate in 
all material respects, (2) Quest Diagnostics will represent that it has no 
present intention to undertake the transactions described in part (3)(iii) 
hereafter or cease to engage in the active conduct of providing clinical 
laboratory testing services, (3) Quest Diagnostics will covenant and agree 
that for a period of two years following the Distribution Date (the 
"Restricted Period"), (i) Quest Diagnostics will continue to engage in the 
clinical laboratory testing business, (ii) Quest Diagnostics will continue to 
manage and own at least 50% of the assets which it owns directly and 
indirectly immediately after the Distribution Date and (iii) neither Quest 
Diagnostics, nor any related corporation nor any of their respective 
directors, officers or other representatives will undertake, authorize, 
approve, recommend, permit, facilitate, or enter into any contract, or 
consummate any transaction with respect to: (A) the issuance of Quest 
Diagnostics Common Stock (including options and other instruments convertible 
into Quest Diagnostics Common Stock) which would exceed fifty percent (50%) 
of the outstanding shares of Quest Diagnostics Common Stock immediately after 
the Distribution Date; (B) the issuance of any other instrument that would 
constitute equity for federal tax purposes ("Disqualified Quest Diagnostics 
Stock"); (C) the issuance of options and other instruments convertible into 
Disqualified Quest Diagnostics Stock; (D) any repurchases of Quest 
Diagnostics Common Stock, unless such repurchases satisfy certain 
requirements; (E) the dissolution, merger, or complete or partial liquidation 
of Quest Diagnostics or any announcement of such action; or (F) the waiver, 
amendment, termination or modification of any provision of the Quest 
Diagnostics Rights Plan (as defined therein) in connection with, or in order 
to permit or facilitate, any acquisition of Quest Diagnostics Common Stock or 
other equity interest in Quest Diagnostics, and (4) Quest Diagnostics will 
agree to indemnify Corning for Taxes (as defined below) arising from 
violations of (1), (2) or (3) above and for Taxes arising as a result of (A) 
an acquisition of 20% or more of the stock of Quest Diagnostics by a person 
or related persons during the Restricted Period or (B) the commencement of a 
tender or purchase offer by a third party for 20% or more of Quest 
Diagnostics stock. If obligations of Quest Diagnostics under this agreement 
were breached and as a result thereof one or both of the Distributions do not 
qualify for the treatment stated in the ruling Corning requested from the IRS 
(the "IRS Ruling"), Quest Diagnostics would be required to indemnify Corning 
for Taxes imposed and such indemnification obligations could exceed the net 
asset value of Quest Diagnostics at such time. 

   Corning and Covance will enter into a tax indemnification agreement (the 
"Corning/Covance Spin-Off Tax Indemnification Agreement") pursuant to which 
(1) Covance will represent to Corning that to the best of its knowledge, 

                                      30 
<PAGE> 

the materials relating to Covance submitted to the IRS in connection with the 
request for ruling submitted to the IRS are complete and accurate in all 
material respects, (2) Covance will represent that it has no present 
intention to undertake the transactions described in part (3)(iii) hereafter 
or to cease to engage in the active conduct of providing contract research 
services, (3) Covance will covenant and agree that during the Restricted 
Period, (i) Covance will continue to engage in the contract research 
business, (ii) Covance will continue to manage and own at least 50% of the 
assets which it owns directly and indirectly immediately after the 
Distribution Date and (iii) neither Covance, nor any related corporations nor 
any of their respective directors, officers or other representatives will 
undertake, authorize, approve, recommend, permit, facilitate, or enter into 
any contract, or consummate any transaction with respect to: (A) the issuance 
of Covance Common Stock (including options and other instruments convertible 
into Covance Common Stock) which would exceed fifty percent (50%) of the 
outstanding shares of Covance Common Stock immediately after the Distribution 
Date; (B) the issuance of any other instrument that would constitute equity 
for federal tax purposes ("Disqualified Covance Stock"); (C) the issuance of 
options and other instruments convertible into Disqualified Covance Stock; 
(D) any repurchases of Covance Common Stock, unless such repurchases satisfy 
certain requirements; (E) the dissolution, merger, or complete or partial 
liquidation of Covance or any announcement of such action; or (F) the waiver, 
amendment, termination or modification of any provision of the Covance Rights 
Plan (as defined therein) in connection with, or in order to permit or 
facilitate, any acquisition of Covance Common Stock or other equity interest 
in Covance and (4) Covance will agree to indemnify Corning for Taxes arising 
from violations of (1), (2) or (3) above and for Taxes arising as a result of 
(A) an acquisition of 20% or more of the stock of Covance by a person or 
related persons during the Restricted Period or (B) the commencement of a 
tender or purchase offer by a third party for 20% or more of Covance stock. 
If obligations of Covance under this agreement were breached and as a result 
thereof one or both of the Distributions do not qualify for the treatment 
stated in the IRS Ruling, Covance would be required to indemnify Corning for 
Taxes imposed and such indemnification obligations could exceed the net asset 
value of Covance at such time. 

   Quest Diagnostics and Covance will enter into a tax indemnification 
agreement (the "Quest Diagnostics/ Covance Spin-Off Tax Indemnification 
Agreement") which will be essentially the same as the Corning/Covance 
Spin-Off Tax Indemnification Agreement except that Covance will make 
representations to and indemnify Quest Diagnostics as opposed to Corning. If 
obligations of Covance under this agreement were breached and as a result 
thereof one or both of the Distributions do not qualify for the treatment 
stated in the IRS Ruling, Covance would be required to indemnify Quest 
Diagnostics for Taxes imposed and such indemnification obligations could 
exceed the net asset value of Covance at such time. Quest Diagnostics and 
Covance will enter into a second tax indemnification agreement (the 
"Covance/Quest Diagnostics Spin-Off Tax Indemnification Agreement") which 
will be essentially the same as the Corning/Quest Diagnostics Spin-Off Tax 
Indemnification Agreement except that Quest Diagnostics will make 
representations to and indemnify Covance as opposed to Corning. If 
obligations of Quest Diagnostics under this agreement were breached and as a 
result thereof one or both of the Distributions do not qualify for the 
treatment stated in the IRS Ruling, Quest Diagnostics would be required to 
indemnify Covance for Taxes imposed and such indemnification obligations 
could exceed the net asset value of Quest Diagnostics at such time. 

   The Spin-Off Tax Indemnification Agreements will also require (i) Quest 
Diagnostics to take such actions as Corning may reasonably request and (ii) 
Covance to take such actions as Corning and Quest Diagnostics may reasonably 
request to preserve the favorable tax treatment provided for in any rulings 
obtained from the IRS in respect of the Distributions. 

Tax Sharing Agreement 

   Corning, Quest Diagnostics and Covance will enter into a tax sharing 
agreement (the "Tax Sharing Agreement") which will allocate responsibility 
for federal income and various other taxes ("Taxes") among the three 
companies. The Tax Sharing Agreement provides that, except for Taxes arising 
as a result of the failure of either or both of the Distributions to qualify 
for the treatment stated in the IRS Ruling (which Taxes are allocated either 
pursuant to the Spin-Off Tax Indemnification Agreements or as described 
below), Corning is liable for and will pay the federal income taxes of the 
consolidated group that includes Quest Diagnostics and Covance and their 
subsidiaries, provided, however, that Quest Diagnostics and Covance are 
required to reimburse Corning for taxes for periods beginning after December 
31, 1995 in which they are members of the Corning consolidated group and for 
which tax returns have not been filed as of the Distribution Date. This 
reimbursement obligation is based on the hypothetical separate federal tax 
liability of Quest Diagnostics and Covance, including their respective 
subsidiaries, calculated on a separate consolidated basis, subject to certain 
adjustments. Under the Tax Sharing Agreement, in the case of adjustments by a 
taxing authority of a 

                                      31 
<PAGE> 

consolidated federal income tax or certain other tax returns prepared by 
Corning which includes Quest Diagnostics or Covance, then, subject to certain 
exceptions, Corning is liable for and will pay any tax assessments, and is 
entitled to any tax refunds, resulting from such audit. 

   The Tax Sharing Agreement further provides that, if either of the 
Distributions fails to qualify for the tax treatment stated in the IRS Ruling 
(for reasons other than those indemnified against under one or more of the 
Spin-Off Tax Indemnification Agreements), Taxes imposed upon or incurred by 
Corning, Quest Diagnostics or Covance as a result of such failure are to be 
allocated among Corning, Quest Diagnostics and Covance in such a manner as 
will take into account the extent to which the actions or inactions of each 
may have contributed to such failure, and Corning, Quest Diagnostics and 
Covance each will indemnify and hold harmless the other from and against the 
taxes so allocated. If it is determined that none of the companies 
contributed to the failure of such distribution to qualify for the tax 
treatment stated in the IRS Ruling, the liability for taxes will be borne by 
each in proportion to its relative average market capitalization as 
determined by the average closing price for the common stock of each during 
the 20 trading-day period immediately following the Distribution Date. In the 
event that either of the Distributions fails to qualify for the tax treatment 
stated in the IRS Ruling and the liability for taxes as a result of such 
failure is allocated among Corning, Quest Diagnostics and Covance, the 
liability so allocated to Quest Diagnostics or Covance could exceed the net 
asset value of Quest Diagnostics or Covance, respectively. 

Voting Cumulative Preferred Stock of Quest Diagnostics 

   After the Distributions, Corning will retain 1,000 shares of Quest 
Diagnostics' voting cumulative preferred stock, with an aggregate liquidation 
preference of $1.0 million. Corning is the sole holder of such shares. For a 
description of the terms of the Quest Diagnostics voting cumulative preferred 
stock, see "Description of Quest Diagnostics Capital Stock--Voting Cumulative 
Preferred Stock." 

                                      32 
<PAGE> 

                          QUEST DIAGNOSTICS INCORPORATED 

                                 RISK FACTORS 

   Corning shareholders should be aware that the Distributions and ownership 
of the Quest Diagnostics Common Stock involve certain risks, including those 
described below, which could adversely affect the value of their holdings. 
Neither Corning nor Quest Diagnostics makes, nor is any other person 
authorized to make, any representations as to the future market value of 
Quest Diagnostics Common Stock. 

Risks Relating to the Distributions 

   Effects on Corning Stock. Following the Distributions, Corning Common 
Stock will continue to be listed and traded on the NYSE and certain other 
stock exchanges. As a result of the Distributions, the trading price of 
Corning Common Stock is expected to be lower than the trading price of 
Corning Common Stock immediately prior to the Distributions. There can be no 
assurance that the combined trading prices of Corning Common Stock, Quest 
Diagnostics Common Stock and Covance Common Stock after the Distributions 
will be equal to or greater than the trading price of Corning Common Stock 
prior to the Distributions. 

Risks Relating to Quest Diagnostics 

   Financial Impact of the Distributions on Quest Diagnostics. While Quest 
Diagnostics has a substantial operating history, it has not operated as an 
independent company since 1982. As a Corning subsidiary, Quest Diagnostics' 
working capital requirements have been financed by Corning and Quest 
Diagnostics' major acquisitions have been financed through the issuance of 
Corning common stock and borrowings from Corning. Subsequent to the 
Distributions, Quest Diagnostics' activities will no longer be financed by 
Corning. In addition, it is anticipated that the rating of Quest Diagnostics' 
long-term debt will be non-investment grade. This may impact, among other 
things, Quest Diagnostics' ability to raise capital, fund working capital 
requirements or expand, through acquisitions or otherwise, and could thereby 
have an adverse effect on Quest Diagnostics' operating earnings and cash 
flow. 

   Substantial Leverage and Debt Service Requirements. After the 
Distributions and as a result of the incurrence of debt under the Quest 
Diagnostics Credit Facility (as defined below) and the issuance of Notes (as 
defined below) in the Quest Diagnostics Notes Offering (as defined below), 
Quest Diagnostics will have substantial debt. At September 30, 1996, after 
giving effect to the transactions and adjustments described in "Pro Forma 
Financial Information of Quest Diagnostics," Quest Diagnostics would have had 
$517 million of total debt and total capitalization of $1,120 million, on a 
pro forma basis, and Quest Diagnostics' total debt as a percentage of total 
capitalization would have been approximately 46%. In addition to creating 
significant debt service obligations for Quest Diagnostics, the terms of the 
Quest Diagnostics Credit Facility will contain customary affirmative and 
negative covenants that will, among other things, require Quest Diagnostics 
to maintain certain financial tests and ratios and will restrict Quest 
Diagnostics' ability to make asset dispositions, incur additional 
indebtedness, make certain payments and investments, transact with affiliates 
or enter into mergers or consolidate. The Indenture will include similar, but 
less restrictive, incurrence tests. 

   The degree to which Quest Diagnostics is leveraged could have important 
consequences to holders of Quest Diagnostics Common Stock, including the 
following: (1) Quest Diagnostics' ability to obtain additional financing in 
the future for working capital, capital expenditures, product development, 
acquisitions, general corporate purposes or other purposes may be impaired; 
(ii) a substantial portion of Quest Diagnostics' and its subsidiaries' cash 
flow from operations must be dedicated to the payment of the principal of and 
interest on its indebtedness; (iii) the Quest Diagnostics Credit Facility 
will contain certain restrictive financial and operating covenants, 
including, among others, requirements that Quest Diagnostics satisfy certain 
financial ratios; (iv) a significant portion of borrowings will be at 
floating rates of interest, causing Quest Diagnostics to be vulnerable to 
increases in interest rates; (v) Quest Diagnostics' degree of leverage may 
make it more vulnerable in a downturn in general economic conditions; and 
(vi) Quest Diagnostics' financial position may limit its flexibility in 
responding to changing business and economic conditions. In addition, the 
Notes will contain certain financial covenants. See "Management's Discussion 
and Analysis of Financial Condition and Results of Operations of Quest 
Diagnostics-- Liquidity and Capital Resources" and "Description of Certain 
Indebtedness of Quest Diagnostics." 

   Intense Competition. The independent clinical laboratory industry in the 
United States is intensely competitive. Quest Diagnostics believes that in 
1995 approximately 56% of the revenues of the clinical laboratory testing 
industry 

                                      33 
<PAGE> 

was generated by hospital-affiliated laboratories, approximately 36% by 
independent clinical laboratories and 8% by thousands of individual 
physicians in their offices and laboratories. Independent clinical 
laboratories fall into two separate categories: (1) smaller, generally local, 
laboratories that generally offer fewer tests and services and have less 
capital than the larger laboratories, and (2) larger laboratories such as 
Quest Diagnostics that provide a broader range of tests and services. Quest 
Diagnostics has two major competitors that operate in the national 
market--SmithKline Beecham Clinical Laboratories, Inc. ("SmithKline") and 
Laboratory Corporation of America Holdings, Inc. ("LabCorp"). Both SmithKline 
and LabCorp are affiliated with larger corporations that have greater 
financial resources than Quest Diagnostics. There are also many independent 
clinical laboratories that operate regionally and that compete with Quest 
Diagnostics in these regions. In addition, hospitals are in general both 
competitors and customers of independent clinical laboratories. The 
independent clinical laboratory testing industry has experienced intense 
price competition over the past several years, which has negatively impacted 
Quest Diagnostics' profitability. The following factors, among others, are 
often used by health care providers in selecting a laboratory: (i) pricing of 
the laboratory's testing services; (ii) accuracy, timeliness and consistency 
in reporting test results; (iii) number and type of tests performed; (iv) 
service capability and convenience offered by the laboratory; and (v) its 
reputation in the medical community. See "Business of Quest Diagnostics--The 
Clinical Laboratory Testing Industry" and "Business of Quest 
Diagnostics--Competition." 

   Role of Managed Care. Managed care organizations play a significant role 
in the health care industry and their role is expected to increase over the 
next several years. Managed care organizations typically negotiate capitated 
payment contracts, whereby a clinical laboratory receives a fixed monthly fee 
per covered individual, regardless of the number or cost of tests performed 
during the month (excluding certain tests, such as esoteric tests and 
anatomic pathology services). Laboratory services agreements with managed 
care organizations have historically been priced aggressively due to 
competitive pressure and the expectation that a laboratory would capture not 
only the volume of testing to be covered under the contract, but also the 
additional fee-for-service business from patients of participating physicians 
who are not covered under the managed care plan. However, as the number of 
patients covered under managed care plans continues to increase, there is 
less such fee-for-service business and, accordingly, less high margin 
business to offset the low margin (and often unprofitable) managed care 
business. Furthermore, increasingly, physicians are affiliated with more than 
one managed care organization and as a result may be required to refer 
clinical laboratory tests to different clinical laboratories, depending on 
the coverage of their patients. As a result, a clinical laboratory might not 
receive any fee-for-service testing from such physicians. See "Business of 
Quest Diagnostics--Customers and Payors" and "Business of Quest 
Diagnostics--Effect of the Growth of the Managed Care Sector on the Clinical 
Laboratory Business." During the nine months ended September 30, 1996, 
services to managed care organizations under capitated rate agreements 
accounted for approximately 6% of Quest Diagnostics' net revenues from 
clinical laboratory testing and approximately 15% of the tests performed by 
Quest Diagnostics. Quest Diagnostics is currently reviewing its pricing 
structures for agreements with managed care organizations and intends to 
insure that all of its future agreements with managed care organizations are 
profitably priced. However, there can be no assurance that Quest Diagnostics 
will be able to increase the prices charged to managed care organizations or 
that Quest Diagnostics will not lose market share in the managed care market 
to other clinical laboratories who continue to aggressively price laboratory 
services agreements with managed care organizations. Quest Diagnostics may 
experience declines in per-test revenue as managed care organizations 
continue to increase their share of the health care insurance market. 

   Reliance on Medicare/Medicaid Reimbursements. Approximately 23% and 22% of 
Quest Diagnostics' net revenues for the year ended December 31, 1995 and the 
nine months ended September 30, 1996, respectively, were attributable to 
tests performed for Medicare and Medicaid beneficiaries. Quest Diagnostics' 
business and financial results depend substantially on reimbursements paid to 
Quest Diagnostics under these programs. Quest Diagnostics is legally required 
to accept the government's reimbursement for most Medicare and Medicaid 
testing as payment in full. Such reimbursements are generally made pursuant 
to fee schedules, which are subject to certain limitations the levels of 
which have declined steadily since late 1984. Congress enacted a phased-in 
set of reductions in the reimbursement limitations as part of its 1993 budget 
legislation that reduced the Medicare national limitations in 1994 to 84% of 
the 1984 national median, in 1995 to 80% of the 1984 national median and in 
1996 to 76% of the 1984 national median. In 1995, both houses of Congress 
passed a bill (the Medicare Preservation Act) that would have reduced the fee 
cap schedule from 75% to 65% of the 1984 national median, but the bill was 
vetoed by the President. Effective January 1, 1996, the Health Care Financing 
Administration ("HCFA") adopted a new policy on reimbursement for chemistry 
panel tests. As of January 1, 1996, 22 automated tests (rather than 19 tests) 
became reimbursable by Medicare as part of an automated chemistry profile. An 
additional allowance of $0.50 per test is 

                                      34 
<PAGE> 

authorized when more than 19 tests are billed in a panel. HCFA retains the 
authority to expand in the future the list of tests included in a panel. 
Effective as of March 1, 1996, HCFA eliminated its prior policy of permitting 
payment for all tests contained in an automated chemistry panel when at least 
one of the tests in the panel is medically necessary. Under the new policy, 
Medicare payment will not exceed the amount that would be payable if only the 
tests that are "medically necessary" had been ordered. In addition, since 
1995 most Medicare carriers have begun to require clinical laboratories to 
submit documentation supporting the medical necessity, as judged by ordering 
physicians, for many commonly ordered tests. Quest Diagnostics expects to 
incur additional reimbursement reductions and additional costs associated 
with the implementation of these requirements of HCFA and Medicare carriers. 
The amount of the reductions in reimbursements and additional costs cannot be 
determined at this time. These and other proposed changes affecting the 
reimbursement policy of Medicare and Medicaid programs could have a material 
adverse effect on the business, financial condition, results of operations or 
prospects of Quest Diagnostics. See "Business of Quest 
Diagnostics--Regulation and Reimbursement--Regulation of Reimbursement for 
Clinical Laboratory Services." A failure of Quest Diagnostics to properly and 
promptly process its bills to Medicare may result in an increase in Quest 
Diagnostics' bad debt expense. See "Business of Quest Diagnostics-- Billing" 
and "Management's Discussion and Analysis of Financial Condition and Results 
of Operations of Quest Diagnostics--Results of Operations." 

   Government Regulation. The clinical laboratory industry is subject to 
extensive governmental regulations at the federal, state and local levels. 
See "Business of Quest Diagnostics--Regulation and Reimbursement." 

   At the federal level, Quest Diagnostics' laboratories are required to be 
certified under the Clinical Laboratory Improvement Amendments of 1988 
("CLIA") and approved to participate in the Medicare/Medicaid programs. 
Currently, all clinical laboratories, including most physician-office 
laboratories ("POLs"), are required to comply with CLIA. However, the 
Medicare Preservation Act, passed in 1995 by both Houses of Congress, would 
have largely exempted POLs from having to comply with CLIA (except with 
respect to pap smear tests). Although this provision was not maintained by 
the House-Senate conference and was not included in the subsequent 
legislation, it could be reintroduced at any time. The exemption of POLs from 
CLIA would significantly reduce their costs, making them more financially 
viable and a greater competitive challenge to Quest Diagnostics and would 
more likely encourage physicians to establish laboratories in their offices. 

   A wide array of Medicare/Medicaid fraud and abuse provisions apply to 
clinical laboratories participating in such programs. Penalties for 
violations of these federal laws include exclusion from participation in the 
Medicare/ Medicaid programs, asset forfeitures, civil and criminal penalties. 
Civil penalties for a wide range of offenses may be up to $2,000 per item and 
twice the amount claimed. These penalties will be increased effective January 
1, 1997 to up to $10,000 per item plus three times the amount claimed. In the 
case of certain offenses, exclusion from participation in Medicare and 
Medicaid is a mandatory administrative penalty. The Office of the Inspector 
General ("OIG") of the Department of Health and Human Services ("HHS") 
interprets these fraud and abuse administrative provisions liberally and 
enforces them aggressively. Provisions in a bill enacted in August 1996 are 
likely to expand the federal government's involvement in curtailing fraud and 
abuse due to the establishment of (i) an anti-fraud and abuse trust fund 
funded through the collection of penalties and fines for violations of such 
laws and (ii) a health care anti-fraud and abuse task force. See "Business of 
Quest Diagnostics--Regulation and Reimbursement." 

   
   Government Investigations and Related Claims. As discussed under "Business of
Quest Diagnostics-- Government Investigations and Related Claims," Quest
Diagnostics has settled various government and private claims (i.e.,
nongovernmental claims such as those by private insurers) totalling
approximately $195 million relating primarily to industry-wide billing and
marketing practices that had been substantially discontinued by early 1993.
Specifically, Quest Diagnostics has entered into, (i) for an aggregate of
approximately $180 million, five settlements with the OIG and the DOJ and two
settlements with state governments with respect to Medicare and Medicaid
marketing and billing practices of Quest Diagnostics and certain companies
acquired by Quest Diagnostics prior to their acquisition and (ii) twelve
completed settlements and one tentative settlement relating to private claims
totalling approximately $15 million. In addition, there are pending
investigations by the OIG and DOJ into billing and marketing practices at three
regional laboratories operated by Nichols prior to its acquisition by Quest
Diagnostics. There are no other private claims presently pending. By issuance of
civil subpoenas in August 1993, the government began a formal investigation of
Nichols. The investigation of Nichols remains open. Remedies available to the
government include exclusion from participation in the Medicare and Medicaid
programs, criminal fines, civil recoveries plus civil penalties and asset
forfeitures. Although application of such remedies and penalties could
materially and adversely affect Quest Diagnostics' business, financial
condition, results of operations and
    



                                      35 
<PAGE> 

prospects management believes that the ossibility of this happening is remote.
Quest Diagnostics derived approximately 23% and 22% of its net revenues for the
year ended December 31, 1995 and the nine months ended September 30, 1996,
respectively, from Medicare and Medicaid programs.


   In connection with the Distributions, Corning will agree to indemnify 
Quest Diagnostics against all monetary penalties, fines or settlements for 
any governmental claims arising out of alleged violations of certain federal 
fraud and health care statutes and relating to billing practices of Quest 
Diagnostics and its predecessors that have been settled or are pending on the 
Distribution Date. Corning will also agree to indemnify Quest Diagnostics for 
50% of the aggregate of all judgment or settlement payments made by Quest 
Diagnostics that are in excess of $42.0 million in respect of claims by 
private parties (i.e., nongovernmental parties such as private insurers) that 
relate to indemnified or previously settled governmental claims and that 
allege overbillings by Quest Diagnostics or any existing subsidiaries of 
Quest Diagnostics, for services provided prior to the Distribution Date; 
provided, however, such indemnification will not exceed $25.0 million in the 
aggregate and all amounts indemnified against by Corning for the benefit of 
Quest Diagnostics will be calculated on a net after-tax basis. However, such 
indemnification will not cover (i) any governmental claims that arise after 
the Distribution Date pursuant to service of subpoena or other notice of such 
investigation after the Distribution Date, (ii) any nongovernmental claims 
unrelated to the indemnified governmental claims or investigations, (iii) any 
nongovernmental claims not settled prior to five years after the Distribution 
Date, (iv) any consequential or incidental damages relating to the billing 
claims, including losses of revenues and profits as a consequence of 
exclusion for participation in federal or state health care programs or (v) 
the fees and expenses of litigation. Quest Diagnostics will control the 
defense of any governmental claim or investigation unless Corning elects to 
assume such defense. However, in the case of all nongovernmental claims 
related to indemnified governmental claims related to alleged overbillings, 
Quest Diagnostics will control the defense. All disputes under the 
Transaction Agreement are subject to binding arbitration. See "The 
Relationship Among Corning, Quest Diagnostics and Covance After the 
Distributions--Transaction Agreement." 



   Quest Diagnostics' aggregate reserve with respect to all governmental and 
private claims, including litigation costs of approximately $6.6 million, was 
$215 million at September 30, 1996 and is estimated to be reduced to $85 
million as of the Distribution Date as a result of the payment of settled 
claims, primarily the Damon settlement of $119 million. Based on information 
available to management and Quest Diagnostics' experience with past 
settlements (including the fact that the aggregate amount of the Damon 
settlement was significantly in excess of established reserves) management 
has reassessed its reserve levels and believes that its current level of 
reserves is adequate. However, it is possible that additional information 
(such as the indication by the government of criminal activity, additional 
tests being questioned or other changes in the government's theories of 
wrongdoing) may become available which may cause the final resolution of 
these matters to be in excess of established reserves by an amount which 
could be material to Quest Diagnostics' results of operation and, for 
non-indemnified claims, Quest Diagnostics' cash flows in the period in which 
such claims are settled. While none of the governmental or nongovernmental 
investigations or claims is covered by insurance Quest Diagnostics does not 
believe that these matters will have a material adverse effect on Quest 
Diagnostic's overall financial condition. 


   Recent Losses. Quest Diagnostics incurred net losses of $52 million for 
the year ended December 31, 1995 and $158.9 million for the nine months ended 
September 30, 1996. The 1995 net loss includes the provision of $33 million 
for restructuring charges (primarily relating to workforce reduction programs 
and the cost of exiting a number of leased facilities) and $17.6 million of 
special charges related to settlements of governmental billing claims. The 
net loss for the 1996 period reflects the provision of $188 million for 
additional reserves primarily relating to the investigation of 
pre-acquisition billing practices of Damon Corporation and Nichols Institute 
and $13.7 million to write off capitalized software as a result of its 
decision to abandon the billing system which had been intended as a new 
company-wide billing system. See "Management's Discussion and Analysis of 
Financial Condition and Results of Operations of Quest Diagnostics." There 
can be no assurance that Quest Diagnostics' operations will be profitable in 
the future. 


   Billing. Quest Diagnostics' billings have been hampered by both the 
industry-wide phenomenon of frequently missing or incorrect billing 
information and increasingly stringent payor requirements, as well as the 
existence of multiple billing information systems which have resulted in 
large part from Quest Diagnostics' growth through acquisitions. Quest 
Diagnostics' standard billing system has been implemented in seven of its 22 
billing sites, which seven sites account for 35% of Quest Diagnostic's net 
revenues. Quest Diagnostics is beginning to convert the remaining 
non-standard billing systems to the standard SYS system. See "Business of 
Quest Diagnostics--Information Systems" and "Business of Quest 
Diagnostics--Billing." Standardizing its billing systems presents conversion 
risk to Quest Diagnostics as key databases 



                                      36 
<PAGE> 

and masterfiles are transferred to the SYS system and because the billing 
workflow is interrupted during the conversion, which may cause backlogs. 

   Professional Liability Litigation. As a general matter, providers of 
clinical laboratory testing services may be subject to lawsuits alleging 
negligence or other similar legal claims, which suits could involve claims 
for substantial damages. Damages assessed in connection with, and the costs 
of defending any such actions could be substantial. Litigation could also 
have an adverse impact on Quest Diagnostics' client base. Quest Diagnostics 
maintains liability insurance (subject to maximum limits and self-insured 
retentions) for professional liability claims. This insurance does not cover 
liability for any of the investigations described under "--Government 
Investigations and Related Claims" and "Business of Quest 
Diagnostics--Government Investigations and Related Claims." While there can 
be no assurance, Quest Diagnostics management believes that the levels of 
coverage are adequate to cover currently estimated exposures. Although Quest 
Diagnostics believes that it will be able to obtain adequate insurance 
coverage in the future at acceptable costs, there can be no assurance that 
Quest Diagnostics will be able to obtain such coverage or will be able to do 
so at an acceptable cost or that Quest Diagnostics will not incur significant 
liabilities in excess of policy limits. 

   Absence of Dividends; Restrictions on Dividends Imposed by the Quest 
Diagnostics Credit Facility and the Indenture. It is currently contemplated 
that, following the Distributions, Quest Diagnostics will not pay cash 
dividends on the Quest Diagnostics Common Stock in the foreseeable future, 
but will retain earnings to provide funds for the operation and expansion of 
its business. In addition, the Quest Diagnostics Credit Facility prohibits 
Quest Diagnostics from paying cash dividends on the Quest Diagnostics Common 
Stock. Further, the Indenture under which the Notes will be issued will 
restrict Quest Diagnostics' ability to pay cash dividends based on a 
percentage of Quest Diagnostics' cash flow. See "Description of Certain 
Indebtedness of Quest Diagnostics" and "Description of Quest Diagnostics 
Capital Stock." 

   Potential Liability under the Spin-Off Tax Indemnification 
Agreements. Quest Diagnostics will enter into the Corning/Quest Diagnostics 
Spin-Off Tax Indemnification Agreement that will prohibit Quest Diagnostics 
for a period of two years after the Distribution Date from taking certain 
actions, including a sale of 50% or more of the assets of Quest Diagnostics 
or engaging in certain equity or financing transactions, that might 
jeopardize the favorable tax treatment of the Distributions under Code 
section 355 and will provide Corning with certain rights of indemnification 
against Quest Diagnostics. Quest Diagnostics may also have indemnification 
obligations under the Spin-Off Tax Indemnification Agreements in the case of 
the acquisition of, or tender or purchase offer by another person for, 20% or 
more of the outstanding Quest Diagnostics Common Stock. The Corning/Quest 
Diagnostics Spin- Off Tax Indemnification Agreement will also require Quest 
Diagnostics to take such actions as Corning may reasonably request to 
preserve the favorable tax treatment provided for in any rulings obtained 
from the IRS in respect of the Distributions. Quest Diagnostics and Covance 
will enter into the Covance/Quest Diagnostics Spin-Off Tax Indemnification 
Agreement, that will be essentially the same as the Corning/Quest Diagnostics 
Spin-Off Tax Indemnification except that Quest Diagnostics will make 
representations to and indemnify Covance as opposed to Corning. If 
obligations of Quest Diagnostics under either agreement were breached and 
primarily as a result thereof the Distributions do not receive favorable tax 
treatment under Code section 355, Quest Diagnostics would be required to 
indemnify Corning or Covance, as the case may be, for Taxes imposed and such 
indemnification obligations could exceed the net asset value of Quest 
Diagnostics at such time. See "The Relationship Among Corning, Quest 
Diagnostics and Covance After the Distributions--Spin-Off Tax Indemnification 
Agreements." 

   Absence of a Prior Public Market. Prior to the Distributions, there has 
been no public market for the Quest Diagnostics Common Stock. Although it is 
expected that the Quest Diagnostics Common Stock will be approved for listing 
on the NYSE, there is no existing market for the Quest Diagnostics Common 
Stock and there can be no assurance as to the liquidity of any markets that 
may develop, the ability of Quest Diagnostics stockholders to sell their 
shares of Quest Diagnostics Common Stock or at what price Quest Diagnostics 
stockholders will be able to sell their shares of Quest Diagnostics Common 
Stock. Future trading prices will depend on many factors including, among 
other things, prevailing interest rates, Quest Diagnostics' operating results 
and the market for similar securities. 

   Potential Volatility of Stock Price. The market price of Quest Diagnostics 
Common Stock could be subject to wide fluctuations in response to seasonal 
variations in operating results, changes in earnings estimates by analysts, 
market conditions in the clinical laboratory industry, prospects for health 
care reform, changes in government regulation and general economic 
conditions. In addition, the stock market has from time to time experienced 

                                      37 
<PAGE> 

significant price and volume fluctuations that have been unrelated to the 
operating performance of particular companies. Moreover, Quest Diagnostics 
Common Stock could be subject to wide fluctuations for some time after the 
Distributions as a result of heavy trading volume stemming from sales by 
shareholders of Corning Common Stock who decide not to continue owning Quest 
Diagnostics Common Stock. Certain of such sales may include those to be made 
on behalf of investment plans maintained for the benefit of Corning 
employees. These plans currently hold slightly less than 5% of the 
outstanding Corning Common Stock and, as a result of the Distributions, are 
expected to hold a similar percentage of the Quest Diagnostics Common Stock. 
From time to time as market conditions warrant, and as the administrator of 
the plans believes to be in the best interests of the employee beneficiaries, 
the administrator will sell all of the Quest Diagnostics Common Stock held by 
the plans. Such sales are expected to occur within a period of three years 
after the Distribution Date. See "Security Ownership by Certain Beneficial 
Owners and Management of Quest Diagnostics." These market fluctuations could 
have an adverse effect on the market price of Quest Diagnostics Common Stock. 
Quest Diagnostics stockholders should be aware, and must be willing to bear 
the risk, of such fluctuations in earnings and stock price. 

   Dependence on Key Employees. Quest Diagnostics' affairs are managed by a 
small number of key management personnel, the loss of any of whom could have 
an adverse impact on Quest Diagnostics. There can be no assurance that Quest 
Diagnostics can retain its key managerial and technical employees or that it 
can attract, assimilate or retain other skilled technical personnel in the 
future. See "Business of Quest Diagnostics--Recent Organizational Changes" 
and "Management of Quest Diagnostics." 

   Certain Antitakeover Effects. Quest Diagnostics' amended and restated 
certificate of incorporation (the "Quest Diagnostics Certificate") and 
by-laws (the "Quest Diagnostics By-Laws"), and the Delaware General 
Corporation Law ("DGCL"), contain several provisions that could have the 
effect of delaying, deferring or preventing a change in control of Quest 
Diagnostics in a transaction not approved by the board of directors of Quest 
Diagnostics (the "Quest Diagnostics Board"), or, in certain circumstances, by 
the disinterested members of the Quest Diagnostics Board. In addition, an 
acquisition of certain securities or assets of Quest Diagnostics within two 
years after the Distribution Date might jeopardize the tax treatment of the 
Distributions and could result in Quest Diagnostics being required to 
indemnify Corning and Covance. See "--Potential Liability under the Spin-Off 
Tax Indemnification Agreements" and "Antitakeover Effects of Certain 
Provisions of the Quest Diagnostics Certificate of Incorporation and 
By-Laws." 

                                      38 
<PAGE> 

                     CAPITALIZATION OF QUEST DIAGNOSTICS 

   The following table sets forth Quest Diagnostics' capitalization as of 
September 30, 1996 giving effect to (i) the consummation of the Quest 
Diagnostics Notes Offering and the estimated initial borrowings under the 
Quest Diagnostics Credit Facility, (ii) the Distributions and (iii) the Quest 
Diagnostics Accounting Policy Change (as defined below), as if such 
transactions occurred on such date. This table should be read in conjunction 
with the Quest Diagnostics Financial Statements and notes thereto and the 
Quest Diagnostics Pro Forma Financial Information (as defined below) and 
notes thereto included elsewhere herein. Historical combined and pro forma 
combined financial information may not be indicative of Quest Diagnostics' 
future capitalization as an independent company. See "Management's Discussion 
and Analysis of Financial Condition and Results of Operations of Quest 
Diagnostics" and "Business of Quest Diagnostics." 

<TABLE>
<CAPTION>
                                                        Pro Forma 
                                         Historical    Adjustments       Pro Forma 
                                         ----------    ------------   ------------- 
                                                       (in thousands) 
<S>                                      <C>           <C>            <C>
Cash                                     $   48,319     $   (8,319)(a)  $   40,000 
                                         ==========      ========        ========= 
Short-term Debt: 
 Current portion of long-term debt       $   11,885     $  (10,000)(b)  $    1,885(h) 
 Revolving credit facility                                         (c) 
                                         ----------      --------        --------- 
  Total Short-term Debt                  $   11,885     $  (10,000)     $    1,885 
                                         ==========      ========        ========= 
Long-term Debt: 
 Term loans                              $   15,494     $  350,000 (b)  $  365,494(h) 
 Notes                                                     150,000 (b)     150,000 
 Payable to Corning                       1,204,406         (8,319)(a) 
                                                          (447,669)(b) 
                                                          (748,418)(d) 
                                         ----------      ---------       --------- 
  Total Long-term Debt                    1,219,900       (704,406)        515,494 
                                         ----------      ---------       --------- 
Stockholder's Equity: 
 Contributed capital                        297,823        748,418 (d) 
                                                            11,250 (e) 
                                                           150,000 (f)   1,207,491 
 Accumulated deficit                       (163,158)       (13,239)(e) 
                                                          (425,000)(g)    (601,397) 
 Cumulative translation adjustment.           1,801                          1,801 
 Market valuation adjustment                 (3,796)                        (3,796) 
                                         ----------      ---------       --------- 
  Total Stockholder's Equity                132,670        471,429         604,099 
                                         ----------      ---------       --------- 
Total Capitalization                     $1,352,570     $ (232,977)     $1,119,593 
                                         ==========      =========       ========= 
</TABLE>

(a) Historically, Quest Diagnostics has participated in Corning's centralized 
    treasury and cash management processes. Cash received from operations was 
    generally transferred to Corning on a daily basis. Cash disbursements for 
    operations and investments were funded as needed from Corning. The cash 
    balance at the Distribution Date will range from $30 million to $40 
    million. The pro forma adjustment to cash and payable to Corning 
    represents the reduction to bring cash to the Distribution Date range. 
(b) The pro forma adjustment to current portion of long-term debt, term 
    loans, Notes, and payable to Corning reflects borrowings by Quest 
    Diagnostics, immediately prior to the Quest Diagnostics Spin-Off 
    Distribution, to repay Corning for certain income tax liabilities and 
    intercompany borrowings. The assumed interest rates on these borrowings 
    are 7.50% and 11.50% for the Quest Diagnostics Credit Facility and the 
    Notes, respectively. 
(c) The Quest Diagnostics Credit Facility will include a revolving credit 
    facility of $100 million which can be used to fund working capital and 
    investment activities. Quest Diagnostics management believes that the 
    entire revolving credit facility will be available at the Distribution 
    Date. 
(d) The pro forma adjustment to payable to Corning and contributed capital of 
    $748.4 million reflects Corning's capital contribution to Quest 
    Diagnostics of the estimated remaining intercompany borrowings. 
(e) The pro forma adjustment to contributed capital and accumulated deficit 
    represents costs directly related to the Quest Diagnostics Spin-Off 
    Distribution that Quest Diagnostics expects to record coincident with the 
    Quest Diagnostics Spin-Off Distribution. These costs, which are estimated 
    at $20.2 million ($13.2 million after tax), include approximately $9.0 
    million related to professional advisory and financing commitment fees 
    and $11.2 million related to the establishment of an employee stock 
    ownership plan. This amount is subject to change based on the market 
    price of the Quest Diagnostics Common Stock on the Distribution Date. 
(f) The pro forma adjustment to contributed capital represents the estimated 
    capital contribution related to Corning's indemnification under the 
    Transaction Agreement. See "The Relationship Among Corning, Quest 
    Diagnostics and Covance After the Distributions--Transaction Agreement." 
    As a result of funding settled claims, primarily the Damon settlement of 
    $119 million, the receivable from Corning is estimated to approximate $25 
    million at the Distribution Date. 
(g) Coincident with the Quest Diagnostics Spin-Off Distribution, Quest 
    Diagnostics will adopt a new accounting policy for evaluating and 
    measuring the recoverability of intangible assets based on a fair value 
    approach (the "Quest Diagnostics Accounting Policy Change"). The pro 
    forma adjustment to accumulated deficit represents the estimated impact 
    of the Quest Diagnostics Accounting Policy Change. Quest Diagnostics 
    management estimates the charge to reduce the carrying value of 
    intangible assets to fair value will be in the range of $400 million to 
    $450 million. The midpoint of the range has been utilized for the 
    preparation of the Unaudited Pro Forma Combined Balance Sheet. 
(h) The current portion of long-term debt and the term loans, exclusive of 
    the pro forma adjustment, consists primarily of a mortgage note payable 
    and capital lease obligations. 
                                      39 
<PAGE> 

           SELECTED HISTORICAL FINANCIAL DATA OF QUEST DIAGNOSTICS 

   The following table presents selected historical financial data of Quest 
Diagnostics at the dates and for each of the periods indicated. The selected 
financial data as of and for each of the years ended December 31, 1995, 1994 
and 1993 have been derived from the audited combined financial statements of 
Quest Diagnostics (the "Audited Quest Diagnostics Financial Statements") and 
the notes thereto included elsewhere herein. The selected financial data as 
of and for the three and nine months ended September 30, 1996 and 1995 (the 
"Quest Diagnostics Interim Financial Statements" and, together with the 
Audited Quest Diagnostics Financial Statements, the "Quest Diagnostics 
Financial Statements") and the years ended December 31, 1992 and 1991 have 
been derived from the unaudited combined financial statements of Quest 
Diagnostics. In the opinion of management, the unaudited combined financial 
statements include all adjustments, consisting only of normal recurring 
adjustments, that are necessary for a fair presentation of the financial 
position and results of operations for these periods. The unaudited interim 
results of operations for the three and nine months ended September 30, 1996 
are not necessarily indicative of the results for the entire year ending 
December 31, 1996. 

   The selected financial data should be read in conjunction with the Quest 
Diagnostics Financial Statements and notes thereto, and the Quest Diagnostics 
Pro Forma Financial Information and notes thereto included elsewhere herein. 
Historical combined financial data may not be indicative of Quest 
Diagnostics' future performance as an independent company. See the Quest 
Diagnostics Financial Statements and notes thereto and Quest Diagnostics Pro 
Forma Financial Information. See also "Management's Discussion and Analysis 
of Financial Condition and Results of Operations of Quest Diagnostics" and 
"Business of Quest Diagnostics." 

                                      40 
<PAGE> 

<TABLE>
<CAPTION>
                                                 Three Months Ended               Nine Months Ended 
                                                    September 30,                   September 30, 
                                             ----------------------------   ----------------------------- 
                                                 1996            1995           1996             1995 
                                             -------------    -----------    ------------   ------------- 
                                                       (in thousands, except percentage data) 
<S>                                          <C>              <C>            <C>            <C>
Statement of Operations Data: 
Net revenues                                 $  405,352       $  399,959     $1,231,290       $1,239,474 
Costs and expenses: 
 Cost of services                               255,390          240,868        768,809          735,984 
 Selling, general and administrative            125,190          181,346(b)     371,439          399,635(b) 
 Provision for restructuring and other 
   special charges(c)                           155,730                         201,730           45,885 
 Interest expense, net                           19,866           20,927         59,887           61,529 
 Amortization of intangible assets               10,328           11,293         31,772           33,678 
 Other, net                                       1,837            1,930           (198)           4,429 
                                               --------        --------        --------        -------- 
  Total                                         568,341          456,364      1,433,439        1,281,140 
                                               --------        --------        --------        -------- 
Income (loss) before taxes                     (162,989)         (56,405)      (202,149)         (41,666) 
Income tax expense (benefit)                    (43,553)         (17,810)       (43,280)          (3,642) 
                                               --------        --------        --------        -------- 
Income (loss) before cumulative effect 
  of change in accounting principle            (119,436)         (38,595)      (158,869)         (38,024) 
Cumulative effect of change in 
  accounting principle 
                                               --------        --------        --------        -------- 
Net income (loss)                            $ (119,436)      $  (38,595)    $ (158,869)      $  (38,024) 
                                               ========        ========        ========        ======== 

Balance Sheet Data (at end of period): 
 Cash                                        $   48,319       $   46,908     $   48,319       $   46,908 
 Working capital                                114,718          129,319        114,718          129,319 
 Total assets                                 1,886,378        1,896,058      1,886,378        1,896,058 
 Long-term debt                               1,219,900        1,114,367      1,219,900        1,114,367 
 Total debt                                   1,231,785        1,226,211      1,231,785        1,226,211 
 Stockholder's equity                           132,670          320,576        132,670          320,576 

Ratio of earnings to fixed charges                 --  (d)          --  (d)        --  (d)          --  (d) 

Supplemental Data: 
 Net cash provided by operating 
   activities                                $   25,236       $   38,202     $   41,937       $   53,789 
 Net cash used in investing activities           (7,904)         (17,044)       (53,097)         (77,911) 
 Net cash provided by (used in) 
   financing activities                          (6,618)         (18,006)        23,033           32,311 
 EBITDA(e)                                   $ (118,123)(f)   $   (9,910)(b) $  (67,030)(f)   $   95,899(b) 
 EBITDA as a % of net revenues                    (29.1)%           (2.5)%         (5.4)%            7.7% 
 Adjusted EBITDA(g)                          $   37,607       $   (9,910)(b) $  134,700       $  141,784(b) 
 Adjusted EBITDA as a % of net  revenues            9.3%            (2.5)%         10.9%            11.4% 
</TABLE>

(Footnotes on page 43) 

                                      41 
<PAGE> 

<TABLE>
<CAPTION>
                                                      Year Ended December 31, 
                              ----------------------------------------------------------------------- 
                                 1995         1994(a)          1993          1992          1991 
                             -----------    -----------    -----------    -----------    -------- 
                                              (in thousands, except percentage data) 
<S>                          <C>            <C>            <C>            <C>            <C>
Statement of Operations 
  Data: 
Net revenues                  $1,629,388     $1,633,699     $1,416,338    $1,228,964       $941,116 
Costs and expenses: 
 Cost of services                980,232        969,844        805,729       657,354        553,810 
 Selling, general and 
  administrative                 523,271(b)     411,939        363,579       334,665        193,934 
 Provision for 
  restructuring and  other 
  special charges(c)              50,560         79,814         99,600        13,000 
 Interest expense, net            82,016         63,295         41,898        31,775         14,205 
 Amortization of 
  intangible assets               44,656         42,588         28,421        21,359         16,556 
 Other, net                        6,221          3,464          6,423        16,300          6,636 
                                ---------      ---------      ---------     ---------       ------- 
  Total                        1,686,956      1,570,944      1,345,650     1,074,453        785,141 
                                ---------      ---------      ---------     ---------       ------- 
Income (loss) before taxes       (57,568)        62,755         70,688       154,511        155,975 
Income tax expense 
  (benefit)                       (5,516)        34,410         25,929        52,115         52,128 
                                ---------      ---------      ---------     ---------       ------- 
Income (loss) before 
  cumulative effect of 
  change in accounting 
  principle                      (52,052)        28,345         44,759       102,396        103,847 
Cumulative effect of 
  change in accounting 
  principle                                                    (10,562) 
                                ---------      ---------      ---------     ---------       ------- 
Net income (loss)             $  (52,052)    $   28,345     $   34,197    $  102,396       $103,847 
                                =========      =========      =========     =========       ======= 

Balance Sheet Data 
 (at end of period): 
 Cash                         $   36,446     $   38,719     $   39,410    $   20,528       $ 24,068 
 Working capital                 200,740        214,358        139,771       161,759        126,406 
 Total assets                  1,853,385      1,882,663      1,861,162     1,024,806        764,087 
 Long-term debt                1,195,566      1,153,054      1,025,787       431,624        270,682 
 Total debt                    1,207,714      1,165,626      1,123,307       474,175        287,973 
 Stockholder's equity            295,801        386,812        395,509       408,149        291,973 

Ratio of earnings to fixed 
  charges                           --  (d)        1.77(d)        2.20(d)       4.44(d)        5.83(d) 

Supplemental Data: 
 Net cash provided by  
  operating  activities       $   85,828     $   37,963     $   99,614    $  101,077       $   --  (h) 
 Net cash used in 
  investing activities           (93,087)       (46,186)      (473,687)     (203,884)          --  (h) 
 Net cash provided by 
  (used in)financing 
  activities                       4,986          7,532        392,956        99,267           --  (h) 
 EBITDA (e)                   $  125,961(b)  $  215,567     $  179,065    $  242,527       $213,593 
 EBITDA as a % of net 
  revenues                           7.7%          13.2%          12.6%         19.7%          22.7% 
 Adjusted EBITDA(g)           $  176,521(b)  $  295,381     $  278,665    $  255,527       $213,593 
 Adjusted EBITDA as a % of 
  net  revenues                     10.8%          18.1%          19.7%         20.8%          22.7% 
</TABLE>

(Footnotes on page 43) 

                                      42 
<PAGE> 

(Footnotes for preceding pages) 

(a) In August 1993, Quest Diagnostics acquired Damon, a national 
    clinical-testing laboratory with approximately $280 million in annualized 
    revenues, excluding Damon's California-based laboratories, which were 
    sold in April 1994. In November 1993, Quest Diagnostics acquired certain 
    clinical-testing laboratories of Unilab Corporation ("Unilab"), with 
    approximately $90 million in annualized revenues. The Damon and Unilab 
    acquisitions were accounted for as purchases. Quest Diagnostics acquired 
    Maryland Medical Laboratory, Inc. ("MML"), Nichols and Bioran Medical 
    Laboratory ("Bioran") in June, August and October 1994, respectively, and 
    accounted for these acquisitions as poolings of interest. Results 
    presented include the results of Quest Diagnostics, MML, Nichols and 
    Bioran on a pooled basis. The increase in 1994 net revenues compared to 
    1993 net revenues was primarily due to the Damon and Unilab acquisitions. 

(b) Includes a third quarter 1995 charge of $62.0 million to increase the 
    reserve for doubtful accounts and allowances resulting from billing 
    systems implementation and integration problems at certain laboratories 
    and increased regulatory requirements. 

(c) Provision for restructuring and other special charges includes charges 
    for restructurings primarily for work force reduction programs, the 
    write-off of fixed assets and the costs of exiting a number of leased 
    facilities. Other special charges is primarily comprised of settlement 
    reserves for claims related to billing practices. See Note 5 to the 
    Audited Quest Diagnostics Financial Statements and Notes 2 and 3 to the 
    Quest Diagnostics Interim Financial Statements. 

(d) For purposes of this calculation, earnings consist of pretax income from 
    continuing operations plus fixed charges. Fixed charges consist of 
    interest expense and one-third of rental expense, representing that 
    portion of rental expense deemed representative of the interest factor. 
    Earnings were insufficient to cover fixed charges by the following 
    amounts (in thousands): 
<TABLE>
<CAPTION>
<S>    <C>         <C>        <C>         <C>                <C>
        Three months Ended      Nine months Ended 
          September 30,          September 30,        Year Ended December 31, 
        ------------------    -------------------     ----------------------- 
         1996        1995       1996       1995               1995 
       $162,989    $56,405    $202,149    $41,666            $57,568 
</TABLE>

   
(e) EBITDA represents income (loss) before income taxes plus net interest
    expense and depreciation and amortization. EBITDA is presented and discussed
    since management believes that EBITDA is a useful adjunct to net income and
    other measurements under generally accepted accounting principles since it
    is a meaningful measure of a leveraged company's performance and ability to
    meet its future debt service requirements, fund capital expenditures and
    meet working capital requirements. EBITDA is not a measure of financial
    performance under generally accepted accounting principles and should not be
    considered as an alternative to (i) net income (or any other measure of
    performance under generally accepted accounting principles) as a measure of
    performance or (ii) cash flows from operating, investing or financing
    activities as an indicator of cash flows or as a measure of liquidity.
    

(f) 1996 EBITDA includes charges of $142 million and $188 million for the 
    three months and nine months ended September 30, 1996, respectively, 
    related to charges to establish additional reserves for settlement 
    issues. In October 1996, Corning contributed $119 million to Quest 
    Diagnostics' capital to fund the settlement of billing issues related to 
    Damon and has agreed to indemnify Quest Diagnostics against certain 
    related and similar claims pending at the Distribution Date. 

   
(g) Adjusted EBITDA represents income (loss) before income taxes plus net
    interest expense, depreciation and amortization and restructuring and other
    special charges. EBITDA and Adjusted EBITDA include bad debt expense.
    Adjusted EBITDA is presented and discussed because management believes that
    Adjusted EBITDA is a useful adjunct to net income and other measurements
    under generally accepted accounting principles since it is a meaningful
    measure of a leveraged company's performance and ability to meet its future
    debt service requirements, fund capital expenditures and meet working
    capital requirements. Adjusted EBITDA is not a measure of financial
    performance under generally accepted accounting principles and should not be
    considered as an alternative to (i) net income (or any other measure of
    performance under generally accepted accounting principles) as a measure of
    performance or (ii) cash flows from operating, investing or financing
    activities as an indicator of cash flows or as a measure of liquidity.
    

(h) 1991 cash flow data, on a basis restated for poolings, is not available. 

                                      43 
<PAGE> 

             PRO FORMA FINANCIAL INFORMATION OF QUEST DIAGNOSTICS 

   The unaudited pro forma combined statements of operations for the three 
and nine months ended September 30, 1996 and for the year ended December 31, 
1995 present the results of operations of Quest Diagnostics assuming that the 
Distributions and the Quest Diagnostics Accounting Policy Change had been 
completed as of January 1, 1995. The unaudited pro forma combined balance 
sheet as of September 30, 1996 presents the combined financial position of 
Quest Diagnostics assuming that the Distributions and the Quest Diagnostics 
Accounting Policy Change had been completed on that date. In the opinion of 
Quest Diagnostics management, the unaudited pro forma combined financial 
information for the year ended December 31, 1995 and the three and nine 
months ended September 30, 1996 (the "Quest Diagnostics Pro Forma Financial 
Information") includes all material adjustments necessary to restate Quest 
Diagnostics' historical results. The adjustments required to reflect such 
assumptions are described in the Notes to the Quest Diagnostics Pro Forma 
Financial Information and are set forth in the "Pro Forma Adjustments" 
column. 

   The Quest Diagnostics Pro Forma Financial Information should be read in 
conjunction with the Quest Diagnostics Financial Statements and notes thereto 
included elsewhere herein. The Quest Diagnostics Pro Forma Financial 
Information presented is for informational purposes only and may not 
necessarily reflect the future results of operations or financial position or 
what the results of operations or financial position would have been had the 
Distributions and the Quest Diagnostics Accounting Policy Change occurred as 
assumed herein, or had Quest Diagnostics been operated as an independent 
company during the periods shown. 

                                      44 
<PAGE> 

                        QUEST DIAGNOSTICS INCORPORATED 
             UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS 
                    Three Months Ended September 30, 1996 

<TABLE>
<CAPTION>
                                                          Pro Forma 
                                            Historical   Adjustments       Pro Forma 
                                            ----------    ----------    --------------- 
                                                          (in thousands, 
                                                 except share and per share data) 
<S>                                         <C>          <C>            <C>
Net revenues                                $ 405,352      $              $   405,352 
Costs and expenses 
 Cost of services                             255,390                         255,390 
 Selling, general and administrative          125,190            0 (a)        125,190 
 Provision for restructuring and other 
  special  charges                            155,730                         155,730 
 Interest expense, net                         19,866       (7,677)(b)         12,189 
 Amortization of intangible assets             10,328       (2,656)(c)          7,672 
 Other, net                                     1,837                           1,837 
                                              --------      --------       --------- 
Loss before taxes                            (162,989)      10,333           (152,656) 
Income tax (benefit) provision                (43,553)       3,032 (d)        (40,521) 
                                              --------      --------       --------- 
Net loss                                    $(119,436)     $ 7,301        $  (112,135) 
                                              ========      ========       ========= 
Pro forma shares outstanding                                               28,901,735 (e) 
                                                                           ========= 
Pro forma net loss per share                                              $     (3.88)(f) 
                                                                           ========= 
</TABLE>

The accompanying notes to unaudited pro forma combined financial information 
are an integral part hereof. 

                                      45 
<PAGE> 

                        QUEST DIAGNOSTICS INCORPORATED 
             UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS 
                     Nine Months Ended September 30, 1996 

<TABLE>
<CAPTION>
                                                                   Pro Forma 
                                                    Historical    Adjustments       Pro Forma 
                                                     ----------    -----------    --------------- 
                                                      (in thousands, except share and per share 
                                                                        data) 
<S>                                                 <C>           <C>             <C>
Net revenues                                        $1,231,290      $              $ 1,231,290 
Costs and expenses 
 Cost of services                                      768,809                         768,809 
 Selling, general and administrative                   371,439             0 (a)       371,439 
 Provision for restructuring and other special 
   charges                                             201,730                         201,730 
 Interest expense, net                                  59,887       (22,949)(b)        36,938 
 Amortization of intangible assets                      31,772        (7,969)(c)        23,803 
 Other, net                                               (198)                           (198) 
                                                       --------      -------         --------- 
Loss before taxes                                     (202,149)       30,918          (171,231) 
Income tax (benefit) provision                         (43,280)        9,065 (d)       (34,215) 
                                                       --------      -------         --------- 
Net loss                                            $ (158,869)     $ 21,853       $  (137,016) 
                                                       ========      =======         ========= 
Pro forma shares outstanding                                                        28,901,735 (e) 
                                                                                     ========= 
Pro forma net loss per share                                                       $     (4.74)(f) 
                                                                                     ========= 
</TABLE>

The accompanying notes to unaudited pro forma combined financial information 
are an integral part hereof. 

                                      46 
<PAGE> 

                        QUEST DIAGNOSTICS INCORPORATED 
             UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS 
                         Year Ended December 31, 1995 

<TABLE>
<CAPTION>
                                                                   Pro Forma 
                                                    Historical    Adjustments       Pro Forma 
                                                     ----------    -----------    --------------- 
                                                             (in thousands, except share 
                                                                 and per share data) 
<S>                                                 <C>           <C>             <C>
Net revenues                                        $1,629,388      $              $ 1,629,388 
Costs and expenses 
 Cost of services                                      980,232                         980,232 
 Selling, general and administrative                   523,271             0 (a)       523,271 
 Provision for restructuring and other special 
   charges                                              50,560                          50,560 
 Interest expense, net                                  82,016       (31,268)(b)        50,748 
 Amortization of intangible assets                      44,656       (10,625)(c)        34,031 
 Other, net                                              6,221                           6,221 
                                                     ---------       -------         --------- 
Loss before taxes                                      (57,568)       41,893           (15,675) 
Income tax (benefit) provision                          (5,516)       12,351(d)          6,835 
                                                     ---------       -------         --------- 
Net loss                                            $  (52,052)     $ 29,542       $   (22,510) 
                                                     =========       =======         ========= 
Pro forma shares outstanding                                                        28,901,735 (e) 
                                                                                     ========= 
Pro forma net loss per share                                                       $     (0.78)(f) 
                                                                                     ========= 
</TABLE>

The accompanying notes to unaudited pro forma combined financial information 
are an integral part hereof. 

                                      47 
<PAGE> 

                        QUEST DIAGNOSTICS INCORPORATED 
                  UNAUDITED PRO FORMA COMBINED BALANCE SHEET 
                              September 30, 1996 

<TABLE>
<CAPTION>
                                                                  Pro Forma 
                                                  Historical     Adjustments      Pro Forma 
                                                   ----------    ------------   ------------ 
                                                                (in thousands) 
<S>                                               <C>            <C>            <C>
ASSETS 

Current Assets: 
 Cash and cash equivalents                        $   48,319     $   (8,319)(g)  $   40,000 
 Accounts receivable                                 323,171                        323,171 
 Inventories                                          25,559                         25,559 
 Deferred taxes on income                            126,906          9,400 (h)     136,306 
 Due from Corning Incorporated                                      150,000 (i)     150,000 
 Prepaid expenses and other assets                    25,217                         25,217 
                                                   ---------      ---------       --------- 
 Total current assets                                549,172        151,081         700,253 
Property, plant and equipment, net                   293,490                        293,490 
Intangible assets, net                             1,001,500       (425,000)(j)     576,500 
Other assets                                          42,216                         42,216 
                                                   ---------      ---------       --------- 
TOTAL ASSETS                                      $1,886,378     $ (273,919)     $1,612,459 
                                                   =========      =========       ========= 

LIABILITIES AND STOCKHOLDER'S EQUITY 

Current Liabilities: 
 Accounts payable and accrued expenses            $  374,058     $    9,000 (k)  $  383,058 
 Current portion of long-term debt                    11,885        (10,000)(h)       1,885 
 Income taxes payable                                 34,212        (18,632)(h) 
                                                                     (7,011)(k)       8,569 
 Due to Corning Incorporated and affiliates           14,299        (14,299) (h) 
                                                   ---------      ---------       --------- 
 Total current liabilities                           434,454        (40,942)        393,512 
Long-term debt, third-party                           15,494        500,000 (h)     515,494 
Payable to Corning                                 1,204,406         (8,319)(g) 
                                                                   (447,669)(h) 
                                                                   (748,418))(l) 
Other liabilities                                     99,354                         99,354 
                                                   ---------      ---------       --------- 
 Total liabilities                                 1,753,708       (745,348)      1,008,360 
                                                   ---------      ---------       --------- 
Stockholder's Equity: 
 Contributed capital                                 297,823        150,000 (i) 
                                                                     11,250 (k) 
                                                                    748,418 (l)   1,207,491 
 Accumulated deficit                                (163,158)      (425,000)(j) 
                                                                    (13,239)(k)    (601,397) 
 Cumulative translation adjustment                     1,801                          1,801 
 Market valuation adjustment                          (3,796)                        (3,796) 
                                                   ---------      ---------       --------- 
 Total stockholder's equity                          132,670        471,429         604,099 
                                                   ---------      ---------       --------- 
TOTAL LIABILITIES 
  AND STOCKHOLDER'S EQUITY                        $1,886,378     $ (273,919)     $1,612,459 
                                                   =========      =========       ========= 
</TABLE>

The accompanying notes to unaudited pro forma combined financial information 
are an integral part hereof. 

                                      48 
<PAGE> 

                        QUEST DIAGNOSTICS INCORPORATED 
         NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL INFORMATION 

Statements of Operations 

(a) The historical financial statements include substantially all of the 
    costs incurred by Corning on Quest Diagnostics' behalf and reflect all of 
    its costs of doing business. Quest Diagnostics management does not expect 
    administrative costs to increase as a result of being an independent, 
    public company. 

(b) The pro forma adjustment to interest expense, net represents the 
    difference between historical intercompany interest expense and interest 
    expense on the third party debt to be incurred in connection with the 
    Quest Diagnostics Spin- Off Distribution. Quest Diagnostics will borrow, 
    immediately prior to the Quest Diagnostics Spin-Off Distribution, 
    approximately $500 million in long-term debt to repay Corning for certain 
    intercompany borrowings. The debt is assumed to consist of $350 million 
    of borrowings under the Quest Diagnostics Credit Facility and $150 
    million of Notes to be issued under the Quest Diagnostics Notes Offering. 
    The assumed interest rates on these new borrowings are 7.50% and 11.50% 
    for the Quest Diagnostics Credit Facility and the Notes, respectively. If 
    the interest rate on the Quest Diagnostics Credit Facility fluctuates by 
    1/8%, interest expense fluctuates by approximately $440,000 annually. 
    Depending on market conditions at the time of the Quest Diagnostics Notes 
    Offering and the consummation of the Quest Diagnostics Credit Facility, 
    the total combined debt amount, the interest rates, and the amounts of 
    each of the Quest Diagnostics Credit Facility and the Notes may vary from 
    that indicated herein. 

(c) The pro forma adjustment to amortization of intangible assets represents 
    the estimated reduction of amortization expense due to the Quest 
    Diagnostics Accounting Policy Change. Most of Quest Diagnostics' 
    intangible assets resulted from business combinations in 1993 accounted 
    for as purchases. Significant changes in the clinical laboratory and 
    health care industries subsequent to 1993 have caused the fair value of 
    Quest Diagnostics' intangible assets to be significantly less than their 
    carrying value. Quest Diagnostics management believes that a valuation of 
    intangible assets based on the amount for which each regional laboratory 
    could be sold in an arm's-length transaction is preferable to using 
    projected undiscounted pre-tax cash flows. Quest Diagnostics believes 
    fair value is a better indicator of the extent to which the intangible 
    assets may be recoverable and therefore may be impaired. Quest 
    Diagnostics management estimates that the reduction of amortization 
    expense will approximate between $10.0 million and $11.3 million annually 
    and $2.5 million and $2.8 million quarterly. The midpoint of the range 
    has been utilized for the preparation of the Unaudited Pro Forma Combined 
    Statements of Operations. 

(d) The pro forma adjustment to income tax (benefit) provision represents the 
    estimated income tax impact of the pro forma reduction in interest 
    expense at the incremental tax rate of 39.5%. The pro forma amortization 
    expense reduction will not impact income taxes as the amortization is not 
    deductible for tax purposes. 

(e) The pro forma common shares outstanding represents Quest Diagnostics 
    management's current estimate of the number of shares to be outstanding 
    after the Quest Diagnostics Spin-Off Distribution. Management's estimate 
    includes (a) the issuance of approximately 28.0 million shares of Quest 
    Diagnostics Common Stock at an exchange ratio of one share of Quest 
    Diagnostics Common Stock issued for every eight shares of Corning Common 
    Stock outstanding at September 30, 1996 and (b) the issuance of an 
    estimated 900,000 shares into the employee stock ownership plan. Quest 
    Diagnostics management's estimate of shares outstanding is subject to 
    change as the result of normal issuances and repurchases of Corning 
    Common Stock prior to the date of the Quest Diagnostics Spin-Off 
    Distribution and finalization of the proposed structure of the employee 
    stock ownership plan. 

(f) Pro forma net loss per share is computed by dividing net loss by the pro 
    forma shares outstanding during each period. Common stock equivalents are 
    not included in the loss per share computation because they do not result 
    in material dilution. Historical net loss per share data is not presented 
    as Quest Diagnostics' historical capital structure is not comparable to 
    periods subsequent to the Quest Diagnostics Spin-Off Distribution. 

Balance Sheet 

(g) Historically, Quest Diagnostics has participated in Corning's centralized 
    treasury and cash management processes. Cash received from operations was 
    generally transferred to Corning on a daily basis. Cash disbursements for 
    operations and investments were funded as needed from Corning. The cash 
    balance at the Distribution Date will range from $30 million to $40 
    million. The pro forma adjustment to cash and payable to Corning 
    represents the reduction to bring cash to the Distribution Date range. 

                                      49 
<PAGE> 

(h) The pro forma adjustment to deferred taxes on income, current portion of 
    long-term debt, income taxes payable, due to Corning Incorporated and 
    affiliates, long-term debt third party and payable to Corning reflects 
    borrowings by Quest Diagnostics, immediately prior to the Quest 
    Diagnostics Spin-Off Distribution, to repay Corning for certain income 
    tax liabilities and intercompany borrowings. The debt is assumed to 
    consist of $350 million of bank borrowings under the Quest Diagnostics 
    Credit Facility and $150 million of Notes to be issued under the Quest 
    Diagnostics Notes Offering. 


(i) The pro forma adjustment to due from Corning Incorporated and contributed 
    capital represents the estimated receivable from Corning and capital 
    contribution related to Corning's indemnification obligations relating to 
    governmental claims under the Transaction Agreement. The receivable from 
    Corning is estimated to approximate $25 million at the Distribution Date. 
    The reduction from $150 million at September 30, 1996 to $25 million at 
    the Distribution Date is due to the funding by Corning of indemnified 
    claims, primarily the Damon settlement of $119 million, subsequent to 
    September 30, 1996 and before the Distribution Date. The remaining 
    receivable will be paid by Corning upon the settlement of the underlying, 
    indemnified claims which is expected to occur within the next twelve 
    months. 


(j) The pro forma adjustment to intangible assets, net and accumulated 
    deficit represents the estimated impact of the Quest Diagnostics 
    Accounting Policy Change. Quest Diagnostics management estimates the 
    charge to reduce the carrying value of intangible assets to fair value 
    will be in the range of $400 million to $450 million. The midpoint of the 
    range has been utilized for the preparation of the Unaudited Pro Forma 
    Combined Balance Sheet. This charge has not been reflected in the 
    Unaudited Pro Forma Combined Statements of Operations because it is 
    non-recurring. See additional discussion on Quest Diagnostics' planned 
    change in accounting policy in note (c) above. 

(k) The pro forma adjustment to accounts payable and accrued expenses, income 
    taxes payable, contributed capital and accumulated deficit represents 
    costs directly related to the Quest Diagnostics Spin-Off Distribution 
    that Quest Diagnostics expects to record coincident with the Quest 
    Diagnostics Spin-Off Distribution. These costs, which are estimated at 
    $20.2 million ($13.2 million after tax), include approximately $9 million 
    related to professional advisory and financing commitment fees and $11.2 
    million related to the establishment of an employee stock ownership plan. 
    This amount is subject to change based on the market price of the Quest 
    Diagnostics Common Stock on the Distribution Date. This charge has not 
    been reflected in the Unaudited Pro Forma Statements of Operations 
    because it is nonrecurring. 

(l) The pro forma adjustment to payable to Corning and contributed capital of 
    $748.4 million reflects Corning's capital contribution to Quest 
    Diagnostics of the estimated remaining intercompany borrowings. 

                                      50 
<PAGE> 

                     MANAGEMENT'S DISCUSSION AND ANALYSIS 
                    OF FINANCIAL CONDITION AND RESULTS OF 
                       OPERATIONS OF QUEST DIAGNOSTICS 

Overview 

   In the last several years, Quest Diagnostics' business has been affected 
by significant government regulation, price competition and rapid change 
resulting from payors' efforts to control cost, utilization and delivery of 
health care services. As a result of these factors, Quest Diagnostics' 
profitability has been impacted by changes in the volume of testing, the 
prices and costs of its services, the mix of payors and the level of bad debt 
expense. 

   Payments for clinical laboratory services are made by government, managed 
care organizations, insurance companies, physicians and patients. Increased 
government regulation focusing on health care cost containment has reduced 
prices and added costs for the clinical laboratory industry by increasing 
complexity and adding new regulatory requirements. Also, in recent years 
there has been a significant shift away from traditional fee-for- service 
health care to managed health care, as employers and other payors of health 
care costs aggressively move the populations they control into lower cost 
plans. Managed care organizations typically negotiate capitated payment 
contracts whereby Quest Diagnostics receives a fixed monthly fee per covered 
individual for all services included under the contract. Capitated contract 
arrangements shift the risks of additional routine testing beyond that 
covered by the capitated payment to the clinical laboratory. The managed care 
industry is growing as well as undergoing rapid consolidation which has 
created large managed care companies that control the delivery of health care 
services for millions of people, and have significant bargaining power in 
negotiating fees with providers, including clinical laboratories. These 
market factors have had a significant adverse impact on prices in the 
clinical laboratory industry, and are major contributors to Quest 
Diagnostics' decline in profitability over the last two years. This growth of 
managed care and use of capitated agreements are expected to continue for the 
foreseeable future. See "Risk Factors--Risks Relating to Quest 
Diagnostics--Role of Managed Care" and "Business of Quest Diagnostics-- 
Effect of the Growth of the Managed Care Sector on the Clinical Laboratory 
Business." 

   A substantial portion of Quest Diagnostics' growth has come from 
acquisitions in the last four years. The largest of these acquisitions were 
the purchases of Damon and certain operations of Unilab in 1993 and the 
acquisitions of MML, Nichols Institute and Bioran in 1994. As a result of 
these acquisitions, Quest Diagnostics has recorded a number of special 
charges for restructuring and integration costs since 1993. See Note 5 to the 
Audited Quest Diagnostics Financial Statements. 

   The MML, Nichols Institute and Bioran transactions were accounted for as 
poolings of interests. The accompanying financial statements of Quest 
Diagnostics have been restated to include the results of operations of these 
pooled entities on a combined basis for all periods presented. The results of 
operations for Damon and Unilab, as well as all other acquisitions accounted 
for as purchases, have been included since their respective dates of 
acquisition. Acquisitions accounted for as purchases have generated large 
amounts of goodwill which are not deductible for tax purposes, giving rise to 
a high effective income tax rate and increased sensitivity of the income tax 
rate to changes in pre-tax income. See Note 4 to the Audited Quest 
Diagnostics Financial Statements. 

   The clinical laboratory industry is subject to seasonal fluctuations in 
operating results. Quest Diagnostics' cash flows are influenced by seasonal 
factors. During the summer months, year-end holiday periods and other major 
holidays, volume of testing declines, reducing net revenues and resulting 
cash flows below annual averages during the third and fourth quarters of the 
year. Winter months are also subject to declines in testing volume due to 
inclement weather, which varies in severity from year to year. 

   The clinical laboratory industry is labor intensive. Approximately half of 
Quest Diagnostics' total costs and expenses are associated with employee 
compensation and benefits. Cost of services, which have approximated sixty 
percent of net revenues over the past several years, consists principally of 
costs for obtaining, transporting and testing specimens. Selling, general and 
administrative expenses consist principally of the cost of the sales force, 
billing operations (including bad debt expense), and general management and 
administrative support. 

Results of Operations 

   Three Months Ended September 30, 1996 Compared with Three Months Ended 
September 30, 1995. Earnings for the third quarter of 1996 were significantly 
below those for the prior year due principally to the impact of special 

                                      51 
<PAGE> 

charges. Before special charges, earnings were significantly above the prior 
year level, which included a $62 million charge to operations to increase 
accounts receivable reserves. 

  Net Revenues 
   Net revenues increased by $5.4 million, or 1.3%, over the three months 
ended September 30, 1995 due to increased revenues from Quest Diagnostics' 
nonclinical testing businesses. Volume of clinical testing increased by 1.8% 
but was offset by average price declines of 1.7%. The majority of the price 
decline resulted from changes in reimbursement policies of various 
third-party payors, shifts in volume to lower-priced managed care business 
and intense price competition in the industry. Also contributing to the price 
decline was a reduction in Medicare fee schedules effective January 1, 1996, 
which accounted for approximately a 1% decrease in net revenues. 

  Costs and Expenses 
   Cost of services increased by $14.5 million from the prior period and as a 
percentage of net revenues increased to 63.0% in 1996 from 60.2% in 1995. 
These increases were due principally to the effects of declining prices and 
increases in salaries and wages associated with improving customer service 
levels, and wage adjustments. 

   Selling, general and administrative expense decreased by $56.2 million 
from the prior period and as a percentage of revenues decreased to 30.9% in 
1996 from 45.3% in 1995. These decreases were due principally to a reduction 
in bad debt expense, which decreased by $55.3 million, from $85.8 million to 
$30.5 million, and as a percentage of net revenues decreased from 21.5% to 
7.5%. The reduction in bad debt expense results primarily from the unusually 
high level of bad debt expense in the prior year, which included a charge of 
$62.0 million to increase receivables reserves. Quest Diagnostics has 
established, and maintains, rigorous programs to improve the effectiveness of 
Quest Diagnostics' billing and collection operations. The established 
programs include standard policies and procedures, employee training programs 
and regular reporting and tracking of key measures by senior management. The 
implementation of these programs during the fourth quarter of 1995 has aided 
in reducing bad debt expense. However, additional requirements to provide 
documentation of the "medical necessity" of testing have added to the backlog 
of unbilled receivables and caused third quarter 1996 bad debt expense as a 
percentage of revenues to increase above the rate Quest Diagnostics had 
experienced during the first two quarters of 1996. Additional efforts to 
collect medical necessity documentation are currently being made and are 
expected to lower bad debt expense below the 1996 third quarter rate during 
1997. * 

   During the third quarter of 1996, Quest Diagnostics recorded a $142.0 
million charge to establish additional reserves associated with government 
and other claims primarily related to billing practices at certain 
laboratories of Damon and Nichols prior to their acquisition by Quest 
Diagnostics. Subsequent to the third quarter, Quest Diagnostics entered into 
an agreement with the DOJ to pay $119.0 million to settle all federal and 
Medicaid claims related to the billing by Damon of certain blood test series 
for federally sponsored health care programs. This payment was fully reserved 
as part of the third quarter charge. Quest Diagnostics' aggregate reserve 
with respect to all governmental and nongovernmental claims, including 
litigation costs, was $215 million at September 30, 1996, and is estimated to 
be reduced to $85 million at the Distribution Date as a result of the payment 
of settled claims, primarily the Damon settlement of $119.0 million. Although 
management believes that established reserves for both indemnified and 
non-indemnified claims are sufficient, it is possible that the final 
resolution of these matters could be in excess of established reserves by an 
amount which could be material to Quest Diagnostics's results of operations 
and, for non-indemnified claims, Quest Diagnostics' cash flows in the periods 
in which such claims are settled. Quest Diagnostics does not believe that 
these matters will have a material adverse effect on Quest Diagnostics' 
overall financial condition. See "Risk Factors--Risks Relating to Quest 
Diagnostics--Government Investigations and Related Claims" and "Business of 
Quest Diagnostics--Government Investigations and Related Claims." 

   Additionally, in the third quarter Quest Diagnostics recorded a charge of 
$13.7 million to write off capitalized software as a result of its decision 
to abandon the billing system which had been intended as its company-wide 
billing system. Management now plans to standardize billing systems using a 
system already implemented in seven of its sites. See "Risk Factors--Risks 
Relating to Quest Diagnostics--Billing," "Business of Quest Diagnostics-- 
Information Systems" and "Business of Quest Diagnostics--Billing" and Note 3 
to the Quest Diagnostics Interim Financial Statements. 



* This is a forward looking statement and is based on current expectations. 
  Actual results may vary materially from those projected. See "Business of 
  Quest Diagnostics--Important Factors Regarding Forward Looking Statements." 
  In particular see factors (c), (d), (j) and (k). 

                                      52 
<PAGE> 

   Net interest expense declined from the prior year's level due to lower 
average borrowings during 1996. Amortization of intangible assets decreased 
below the prior year's level due to certain intangible assets having been 
fully amortized. 

   Quest Diagnostics' effective tax rate is significantly impacted by 
goodwill amortization which is not deductible for tax purposes and which had 
the effect of decreasing the tax benefit rate for the third quarter of 1996. 

   Nine Months Ended September 30, 1996 Compared with Nine Months Ended 
September 30, 1995. Earnings were substantially below those for the prior 
year due principally to special charges, price declines, increases in 
salaries and wages, higher bad debt expense, and unusually severe winter 
weather experienced during the first quarter of 1996. 

  Net Revenues 
   Net revenues decreased by $8.2 million, or .7%, from the prior period, 
principally due to average price declines of approximately 3.4%, partially 
offset by an increase in clinical testing of 1.2% and increased revenues from 
Quest Diagnostics' nonclinical testing businesses. Adversely affecting the 
volume growth was unusually severe winter weather in the northeastern and 
central parts of the United States during the first quarter of 1996. The 
majority of the price declines resulted from changes in reimbursement 
policies of various third-party payors, shifts in volume to lower-priced 
managed care business, and intense price competition in the industry. Also 
contributing to the price declines was a reduction in Medicare fee schedules 
effective January 1, 1996, which accounted for approximately a 1% decrease in 
net revenues. 

  Costs and Expenses 
   Cost of services increased by $32.8 million from the prior period and as a 
percentage of net revenues increased to 62.4% in 1996 from 59.4% in 1995. 
These increases were due principally to the effects of declining prices and 
increases in salaries and wages associated with improving customer service 
levels, and wage adjustments. 

   Selling, general and administrative expense decreased by $28.2 million 
from the prior period and as a percentage of net revenues decreased to 30.2% 
in 1996 from 32.2% in 1995. These decreases were due principally to a 
reduction in bad debt expense, which decreased, by $45.4 million, from $127.3 
million to $81.9 million, and as a percentage of net revenues decreased from 
10.3% to 6.7%, partially offset by costs associated with developing and 
implementing strategic action plans and operating improvement plans. The 
reduction in bad debt expense results primarily from the unusually high level 
of bad debt expense in the prior year, which included a charge of $62.0 
million to increase receivables reserves. Quest Diagnostics has established, 
and maintains, rigorous programs to improve the effectiveness of Quest 
Diagnostics' billing and collection operations. The established programs 
include standard policies and procedures, employee training programs and 
regular reporting and tracking of key measures by senior management. The 
implementation of these programs during the fourth quarter of 1995 has aided 
in reducing bad debt expense. However, additional requirements to provide 
documentation of the "medical necessity" of testing have added to the backlog 
of unbilled receivables and caused third quarter 1996 bad debt expense as a 
percentage of revenues to increase above the rate Quest Diagnostics had 
experienced during the first two quarters of 1996. Additional efforts to 
collect medical necessity documentation are currently being made and are 
expected to lower bad debt expense below the 1996 third quarter rate during 
1997.* 

   In the second quarter of 1996, as a consequence of an investigation begun 
in 1993, the DOJ notified Quest Diagnostics that it has taken issue with 
payments related to certain tests received by Damon from federally funded 
health care programs prior to the acquisition of Damon by Quest Diagnostics. 
Quest Diagnostics management met with the DOJ several times to evaluate the 
substance of the government's allegations. A special charge of $46.0 million 
was recorded in the second quarter of 1996 to establish additional reserves 
equal to management's estimate, at that time, of the low end of the range of 
potential amounts which could be required to satisfy the government's claims. 
During the third quarter of 1996 Quest Diagnostics recorded a $142.0 million 
charge to establish additional reserves associated with government and other 
claims primarily related to billing practices at certain laboratories of 
Damon and Nichols prior to their acquisition by Quest Diagnostics. Subsequent 
to the third quarter, Quest Diagnostics entered into an 

* This is a forward looking statement and is based on current expectations. 
  Actual results may vary materially from those projected. See "Business of 
  Quest Diagnostics--Important Factors Regarding Forward Looking Statements." 
  In particular see factors (c), (d), (j) and (k). 

                                      53 
<PAGE> 

agreement with the DOJ to pay $119.0 million to settle all federal and 
Medicaid claims related to the billing by Damon of certain blood test series 
for federally sponsored health care programs. This payment was fully reserved 
as part of the third quarter charge. Quest Diagnostics' aggregate reserve 
with respect to all governmental and nongovernmental claims, including 
litigation costs, was $215 million at September 30, 1996, and is estimated to 
be reduced to $85 million at the Distribution Date as a result of the payment 
of settled claims, primarily the Damon settlement of $119.0 million. Although 
management believes that established reserves for both indemnified and 
non-indemnified claims are sufficient, it is possible that the final 
resolution of these matters could be in excess of established reserves by an 
amount which could be material to Quest Diagnostics' results of operation 
and, for non-indemnified claims, Quest Diagnostics' cash flows in the periods 
in which such claims are settled. Quest Diagnostics does not believe that 
these matters will have a material adverse effect on Quest Diagnostics' 
overall financial condition. See "Risk Factors--Risks Relating to Quest 
Diagnostics--Government Investigations and Related Claims" and "Business of 
Quest Diagnostics--Government Investigations and Related Claims." 


   In the third quarter Quest Diagnostics recorded a charge of $13.7 million 
to write off capitalized software as a result of its decision to abandon the 
billing system which had been intended as its company-wide billing system. 
Management now plans to standardize billing systems using a system already 
implemented in seven of its sites. See "Risk Factors--Risks Relating to Quest 
Diagnostics--Billing," "Business of Quest Diagnostics--Information Systems" 
and "Business of Quest Diagnostics--Billing" and Note 3 to the Quest 
Diagnostics Interim Financial Statements. 


   In the second quarter of 1995, Quest Diagnostics recorded a provision for 
restructuring totalling $33 million primarily for work force reduction 
programs and the costs of exiting a number of leased facilities. 
Additionally, in the first quarter of 1995 Quest Diagnostics recorded a 
special charge of $12.8 million for the settlement of claims related to the 
inadvertent billing errors of certain laboratory tests that were not 
completely and/or successfully performed or reported due to insufficient 
samples and/or invalid results. 

   Net interest expense remained relatively unchanged from the prior year 
level. Amortization of intangible assets decreased below the prior year level 
due to certain intangible assets having been fully amortized. A gain on the 
sale of several small investments and the favorable settlement of a 
contractual obligation, both of which occurred in 1996, accounted for the 
majority of the change in "other, net" compared to the prior year. 

   Quest Diagnostics' effective tax rate is significantly impacted by 
goodwill amortization which is not deductible for tax purposes. This had the 
effect of reducing the tax benefit rate of Quest Diagnostics in both 1996 and 
1995. The effect of this non-deductibility is particularly apparent when 
amortization increases in proportion to pre-tax earnings, as was the case in 
1995. 

   Year Ended December 31, 1995 Compared with Year Ended December 31, 
1994. Earnings for 1995 were significantly below those for the prior year as 
a result of price declines, higher bad debt expense, and the impact of 
restructuring and other special charges. The 1995 bad debt expense included a 
$62.0 million charge to increase accounts receivable reserves in the third 
quarter. 

  Net Revenues 
   Net revenues of $1.6 billion in fiscal 1995 remained essentially unchanged 
from the prior year. Average price declines, estimated to be 3.7%, were 
offset by estimated growth of approximately 4% in requisition volume. The 
majority of the price declines resulted from changes in reimbursement 
policies of various third-party payors, an accelerated shift in volume to 
lower-priced managed care business, and intense price competition in the 
industry. Also contributing to the price declines was a reduction in Medicare 
fee schedules effective January 1, 1995 which accounted for approximately a 
1% decrease in net revenues. 

  Costs and Expenses 
   Cost of services increased $10.4 million from 1994 and as a percentage of 
net revenues increased to 60.2% in 1995 from 59.4% in 1994. These increases 
were due principally to the impact of price declines and the added cost of 
doing business in an increasingly complex environment. Partially offsetting 
these factors were synergies associated with the elimination of duplicative 
facilities, personnel and administrative functions of acquired entities, 
including Damon, MML and Nichols. 

   Selling, general and administrative expense increased $111.3 million from 
1994 and as a percentage of net revenues increased to 32.1% in 1995 from 
25.2% in 1994. These increases resulted primarily from a higher level 

                                      54 
<PAGE> 

of bad debt expense during 1995. Excluding bad debt expense, selling, general 
and administrative expenses as a percentage of net revenues were 
approximately 22.7% as compared to 21.6% in 1994. 

   Bad debt expense increased to $152.6 million or 9.4% of net revenues in 
1995 from $59.5 million or 3.6% of net revenues in 1994. This increase 
resulted from an increase in ongoing bad debt expense of $31.0 million 
throughout 1995 and a $62.0 million charge to increase bad debt reserves in 
the third quarter of 1995. 

   During 1995, ongoing bad debt expense increased from 4.4% of net revenues 
in the first quarter to 6.4% of net revenues in the fourth quarter. This 
increase is due principally to four developments that have complicated the 
billing process: (1) increased complexity in the health care system; (2) 
increased requirements in complying with fraud and abuse regulations; (3) 
deterioration in reimbursement as the payor mix shifts; and (4) changes in 
Medicare reimbursement policies. These four factors have placed additional 
requirements on the billing process, including the need for specific test 
coding, additional research on processing rejected claims that comply with 
prior practices, increased audits for compliance, and management of a large 
number of contracts which have very different information requirements for 
pricing and reimbursement. 

   In addition to the changes in the billing process, in mid-1995, Quest 
Diagnostics experienced problems integrating billing operations from recent 
acquisitions into existing billing operations and experienced significant 
problems implementing a new billing system at its largest facility in 
Teterboro, New Jersey. These factors, along with the significant changes in 
the billing process discussed in the preceding paragraph, contributed to a 
significant increase in the backlog of unbilled receivables and a significant 
deterioration in the collection of receivables during the third quarter of 
1995. As a result, Quest Diagnostics recorded a charge of $62 million in the 
third quarter to increase accounts receivable reserves. Quest Diagnostics has 
put in place a rigorous program to improve the effectiveness of its billing 
and collection operations and has stabilized the current billing system in 
Teterboro. See "Risk Factors--Risks Relating to Quest Diagnostics--Billing" 
and "Business of Quest Diagnostics--Information Systems" and "--Billing." 

   In the second quarter of 1995, Quest Diagnostics recorded a provision for 
restructuring totalling $33.0 million, consisting primarily of costs for work 
force reduction programs and exiting a number of leased facilities. In the 
first quarter of 1995, Quest Diagnostics recorded a special charge of $12.8 
million for the settlement of claims related to inadvertent billing errors of 
certain laboratory tests that were not completely and/or successfully 
performed or reported due to insufficient samples and/or invalid results. In 
the third quarter of 1994, Quest Diagnostics recorded a provision for 
restructuring and other special charges totalling $79.8 million which 
included $48.2 million of integration costs, $21.6 million of transaction 
expenses, and $10.0 million of other reserves primarily related to the 
Nichols Institute, MML and Bioran acquisitions. See Note 5 to the Audited 
Quest Diagnostics Financial Statements. 

   Net interest expense increased by $18.7 million over the 1994 level due to 
an increase in average debt levels, resulting principally from funding 
investing activities and cash requirements associated with restructuring and 
other special charges. 

   Amortization expense increased principally due to additional intangible 
assets arising from acquisitions completed in 1994 and 1995. Quest 
Diagnostics' effective tax rate is significantly impacted by goodwill 
amortization which is not deductible for tax purposes. This had the effect of 
reducing the tax benefit rate to Quest Diagnostics in 1995 while increasing 
the overall tax rate in 1994. See Note 4 to the Audited Quest Diagnostics 
Financial Statements. 

   Year Ended December 31, 1994 Compared with Year Ended December 31, 
1993. Earnings for 1994 were below those for the prior year due principally 
to price declines, which outpaced the cost efficiencies realized from the 
integration of acquisitions and other activities to reduce costs. 

  Net Revenues 
   Net revenues increased by $217.4 million, or 15.3%, over the prior year, 
due principally to the net impact of acquisitions and dispositions which 
increased net revenues by approximately $240 million. The net effect of 
average price declines, estimated at 4%, offset by an increase in requisition 
volume, estimated at 3%, accounted for the remaining change in net revenues. 
The majority of the price declines resulted from a shift in volume to 
lower-priced managed care business, changes in reimbursement policies of 
various third-party payors, and intense price competition. Also contributing 
to the price declines was a reduction in Medicare fee schedules effective 
January 1, 1994 which accounted for approximately a 1% decrease in net 
revenues. 

  Costs and Expenses 
   Cost of services increased $164.1 million over 1993 and as a percentage of 
net revenues increased to 59.4% in 1994 from 56.9% in 1993. These increases 
were due principally to the impact of price declines and the added 

                                      55 
<PAGE> 

cost of doing business in an increasingly complex environment. Partially 
offsetting these factors were synergies realized from integration of 
acquisitions. 

   Selling, general and administrative expense increased $48.4 million over 
1993 and as a percentage of net revenues decreased slightly from 25.7% in the 
prior year to 25.2%. Synergies associated with the elimination of duplicate 
facilities, personnel and administrative functions of acquired entities, 
primarily Damon, MML and Nichols, with those of Quest Diagnostics were 
partially offset by an increase in bad debt expense, which increased by $12.3 
million, from $47.2 million to $59.5 million, and increased from 3.3% of net 
revenues in 1993 to 3.6% in 1994. 

   In the third quarter of 1994, Quest Diagnostics recorded a provision for 
restructuring and other special charges totalling $79.8 million, which 
included $48.2 million of integration costs, $21.6 million of transaction 
expenses, and $10.0 million of other reserves primarily related to the 
Nichols Institute, MML and Bioran acquisitions. Integration costs represented 
the expected costs for closing clinical laboratories in certain markets where 
duplicate Quest Diagnostics and Nichols Institute, MML or Bioran facilities 
existed at the time of the acquisitions. In the third quarter of 1993, Quest 
Diagnostics recorded a provision for restructuring costs and other special 
charges totalling $99.6 million. The restructuring component of this special 
charge aggregated $56.6 million related principally to the integration of 
Quest Diagnostics' operations with those acquired in the Damon acquisition. 
The special charge consisted primarily of a $36.5 million charge to reflect 
the settlement and related legal expenses associated with a compromise 
agreement with the DOJ to settle claims brought on behalf of the OIG. In 
making the settlement, Quest Diagnostics did not admit any wrongdoing in 
connection with its marketing or business practices. See "Risk Factors--Risks 
Relating to Quest Diagnostics--Government Investigations and Related Claims," 
"Business of Quest Diagnostics--Government Investigations and Related Claims" 
and Note 5 to the Audited Quest Diagnostics Financial Statements. 

   Net interest expense increased by $21.4 million over the prior year, due 
principally to increased borrowings associated with financing acquisitions 
and, to a lesser degree, increased borrowing rates. Amortization of 
intangibles increased due to additional intangible assets arising from 
acquisitions completed in 1993 and 1994. 

   Quest Diagnostics' effective tax rate is significantly impacted by 
goodwill amortization which is not deductible for tax purposes, and has the 
effect of increasing the overall tax rate, particularly when amortization 
increases in proportion to pre-tax earnings. This situation was the principal 
contributor to the increase in the 1994 effective tax rate over the prior 
year. See Note 4 to the Audited Quest Diagnostics Financial Statements. 

Liquidity and Capital Resources 


    After the Distributions Concurrently with the Quest Diagnostics Spin-Off
Distribution, Quest Diagnostics' debt will be restructured and equity
recapitalized. Quest Diagnostics plans to complete the Quest Diagnostics Notes
Offering of approximately $150 million principal amount of Notes, and incur
approximately $350 million of borrowings under the Quest Diagnostics Credit
Facility. The proceeds from these borrowings will be used to repay amounts owed
to Corning. Any amounts owed to Corning in excess of the proceeds from these
borrowings will be contributed by Corning to Quest Diagnostics' capital. As a
result of these actions, management estimates that Quest Diagnostics' long-term
debt will be reduced by approximately $720 million to approximately $515
million, and annual interest expense will be reduced by approximately $31
million. The Quest Diagnostics Credit Facility will include a revolving credit
facility of $100 million, substantially all of which is expected to be available
for borrowing at the time of the Distributions.


   Quest Diagnostics estimates that it will invest approximately $20 million
during the fourth quarter of 1996 for capital expenditures, principally related
to facility upgrades and investments in information technology. Capital
expenditures in 1997 are estimated to be approximately $95 million, of which
approximately $10 to $15 million relates to the conversion of billing and
laboratory systems to Quest Diagnostics' standard systems (see "Business of
Quest Diagnostics--Information Systems"). Quest Diagnostics expects to expand
its operations principally through internal growth and accelerated growth in
strategic markets and related lines of business. Quest Diagnostics expects such
activities will be funded from existing cash and cash equivalents, cash flow
from operations, and borrowings under the revolving credit facility. Quest
Diagnostics believes that the revolving credit facility will be sufficient to
meet both its short-term and its long-term financing needs. As a result, Quest
Diagnostics believes it has sufficient financial flexibility and sufficient
access to funds to meet seasonal working capital requirements, capital
expenditures and growth opportunities.

                                      56 
<PAGE> 

   Quest Diagnostics does not anticipate paying dividends on the Quest 
Diagnostics Common Stock in the foreseeable future. In addition, the Quest 
Diagnostics Credit Facility prohibits Quest Diagnostics from paying cash 
dividends on the Quest Diagnostics Common Stock. Further, the Indenture under 
which the Notes will be issued will restrict Quest Diagnostics' ability to 
pay cash dividends on the Quest Diagnostics Common Stock based on a 
percentage of Quest Diagnostics' cash flow. 

   Coincident with the Distributions, Quest Diagnostics plans to record a 
non-recurring charge of approximately $20 million associated with the 
Distributions. The largest component of the charge will be the cost of 
establishing an employee stock ownership plan. The remainder of the charge 
will consist principally of the costs for advisors and other fees associated 
with establishing Quest Diagnostics as a separate publicly traded entity. The 
amount of the charge is subject to change based on the price of the Quest 
Diagnostics Common Stock on the Distribution Date. 

   Although Quest Diagnostics has no present acquisition agreements or 
arrangements, there may be acquisitions or other growth opportunities which 
will require additional external financing, and Quest Diagnostics may from 
time to time seek to obtain funds from public or private issuances of equity 
or debt securities. There can be no assurance that such financing will be 
available on terms acceptable to Quest Diagnostics. See "Risk Factors -- 
Risks Relating to Quest Diagnostics -- Potential Liability under the Spin-Off 
Tax Indemnification Agreements" and "The Relationship Among Corning, Quest 
Diagnostics and Covance After the Distributions--Spin-Off Tax Indemnification 
Agreements." 


   Quest Diagnostics management believes that the recapitalization of Quest 
Diagnostics and the indemnification by Corning against monetary fines, 
penalties or losses from outstanding government claims, together with the 
successful implementation of its business strategy, will generate more 
predictable and improved cash flows. Additionally, Quest Diagnostics 
management believes that these actions, together with Quest Diagnostics' 
leading market position or low cost provider status in a number of geographic 
regions accounting for the majority of its net revenues, will aid Quest 
Diagnostics in meeting the ongoing challenges in the clinical laboratory 
industry brought on by growth in managed care and increased regulatory 
complexity.* 


  Prior to the Distributions 
   Historically, Quest Diagnostics has financed its operations and growth 
with cash flow from operations, borrowings from Corning, and stock issued by 
Corning to finance certain acquisitions on behalf of Quest Diagnostics. 
Investing activities have included business acquisitions and capital 
expenditures for facility expansions and upgrades and information systems 
improvements. Replacement of laboratory equipment has typically been financed 
through operating leases. 

   Net cash provided by operating activities for the nine months ended 
September 30, 1996 was below the level for the comparable period of the prior 
year, as a result of reduced earnings, partially offset by an improved 
collection rate of accounts receivable and a reduction in restructuring 
spending. This improvement in accounts receivable is a direct result of 
specific programs initiated in the fourth quarter of 1995 to improve billing 
operations. Although these programs are continuing, additional requirements 
of customers to provide documentation of the "medical necessity" of testing 
are expected to increase receivable levels in the future. The number of days 
sales outstanding in accounts receivable ("DSOs") for the clinical testing 
business is one measure used by Quest Diagnostics to monitor the 
effectiveness of its billing operations. DSOs were 74 days at September 30, 
1996 and December 31, 1995, 81 days at December 31, 1994, and 90 days at 
December 31, 1993. 

   Net cash provided by operating activities during 1995 increased above the 
prior year despite reduced earnings, due primarily to changes in accounts 
payable and accrued expenses and reduced spending for restructuring 
integration and other special charges. Net cash provided by operating 
activities in 1994 declined from the 1993 level principally due to larger 
increases in accounts receivables and higher levels of spending for 
restructuring, integration and other special charges during 1994. 


   Cash used for investing activities for the nine months ended September 30, 
1996 was below the prior year level due to reduced acquisition activity and 
the sale of several small investments during 1996. Investing activities 
during 



*This is a forward looking statement and is based on current expectations. 
 Actual results may vary materially from those projected. See "Business of 
 Quest Diagnostics--Important Factors Regarding Forward Looking Statements." 
 In particular see factors (a), (b), (c), (d), (e) and (j). 



                                      57 
<PAGE> 

1995, 1994 and 1993 were funded principally by cash flow from operations and 
borrowings from Corning, and were principally for capital expenditures and 
acquisitions. Cash used in investing activities in 1995 exceeded the prior 
year level due principally to cash proceeds generated from the sale of 
certain California operations in 1994. See Note 3 to the Audited Quest 
Diagnostics Financial Statements. 

Net cash provided by financing activities for the nine months ended September 
30, 1996 was below the prior year level due primarily to reduced acquisition 
activity during 1996. Financing activities in 1995, 1994 and 1993 consisted 
principally of dividend payments to and net borrowing activities with 
Corning. 

   
    Adjusted EBITDA 

     Adjusted EBITDA represents income (loss) before income taxes plus net
interest expense, depreciation and amortization and restructuring and other
special charges. EBITDA and Adjusted EBITDA include bad debt expense. Adjusted
EBITDA is presented and discussed because management believes that Adjusted
EBITDA is a useful adjunct to net income and other measurements under generally
accepted accounting principles since it is a meaningful measure of a leveraged
company's performance and ability to meet its future debt service requirements,
fund capital expenditures and meet working capital requirements. Adjusted EBITDA
is not a measure of financial performance under generally accepted accounting
principles and should not be considered as an alternative to (i) net income (or
any other measure of performance under generally accepted accounting principles)
as a measure of performance or (ii) cash flows from operating, investing or
financing activities as an indicator of cash flows or as a measure of liquidity.
    

   Adjusted EBITDA for the third quarter of 1996 was $37.6 million, or 9.3% 
of net revenues. Adjusted EBITDA in the prior year period was ($9.9) million. 
The improvement in Adjusted EBITDA was principally due to a decrease in 
selling, general and administrative expense (which decreased $56.2 million) 
and an increase in net revenues of $5.4 million, partially offset by an 
increase in cost of services (which increased $14.5 million). 

   Adjusted EBITDA for the nine months ended September 30, 1996 was $134.7 
million, or 10.9% of net revenues. Adjusted EBITDA in the prior year period 
was $141.8 million, or 11.4% of net revenues. The decline in Adjusted EBITDA 
was principally due to a decrease in net revenues of $8.2 million and an 
increase in cost of services (which increased $32.8 million), partially 
offset by a decrease in selling, general and administrative expense (which 
decreased $28.2 million). 

   Adjusted EBITDA for 1995 was $176.5 million, or 10.8% of net revenues. 
Adjusted EBITDA for the prior year period was $295.4 million, or 18.1% of net 
revenues. The decline in Adjusted EBITDA was principally due to an increase 
in cost of services (which increased $10.4 million) and an increase in 
selling, general and administrative expense (which increased $111.3 million). 

   Adjusted EBITDA for 1994 was $295.4 million, or 18.1% of net revenues. 
Adusted EBITDA in the prior year period was $278.7 million, or 19.7% of net 
revenues. The increase in Adjusted EBITDA was principally due to an increase 
in revenues (which increased $217.4 million), partially offset by an increase 
in cost of services (which increased $164.1 million) and an increase in 
selling, general and administrative expenses (which increased $48.4 million). 

Changes in Accounting Policies 

   
   Coincident with the Quest Diagnostics Spin-Off Distribution, Quest
Diagnostics management will adopt a new accounting policy for evaluating the
recoverability of intangible assets and measuring possible impairment under
Statement of the Accounting Principles Board No. 17. Most of Quest Diagnostics'
intangible assets resulted from purchase business combinations in 1993.
Significant changes in the clinical laboratory and health care industries
subsequent to 1993, including increased government regulation and movement from
traditional fee-for-service care to managed cost health care, have caused the
fair value of Quest Diagnostics' intangible assets to be significantly less than
carrying value. Quest Diagnostics management believes that a valuation of
intangible assets based on the amount for which each regional laboratory could
be sold in an arm's-length transaction is preferable to using projected
undiscounted pre-tax cash flows. Quest Diagnostics believes fair value is a
better indicator of the extent to which the intangible assets may be recoverable
and therefore, may be impaired. This change in method of evaluating the
recoverability of intangible assets will result in Quest Diagnostics recording a
charge of between


                                      58 
<PAGE> 

$400 million and $450 million coincident with the Quest Diagnostics Spin-Off
Distribution to reflect the impairment of intangible assets. This will result in
a reduction of amortization expense of approximately $10 million to $11.3
million annually and $2.5 million to $2.8 million quarterly. 


    Upon adopting the new policy, management anticipates that the aggregate
market capitalization for Quest Diagnostics will be significantly less than its
net book value. While the market capitalization ascribes a value to Quest
Diagnostics as a whole, Quest Diagnostics' policy values individual laboratories
on a case by case basis, based on the estimated amount for which each regional
laboratory could be sold in an arm's-length transaction. Management believes
that the overall valuation of Quest Diagnostics represented by its market
capitalization ascribes a value to certain underperforming laboratories which is
lower than Quest Diagnostics used in assessing intangible asset recovery. The
higher value ascribed by Quest Diagnostics is principally associated with
management's assumption that a buyer within the industry will value these
businesses based on a multiple of revenues, versus a multiple of current cash
flows, due to the synergy opportunities which exist. While management believes
these estimation methods are reasonable and reflective of common valuation
practices, there can be no assurance that a sale to a buyer for the estimated
value ascribed to a regional laboratory could be completed. Additional factors
which management believes give rise to the difference between Quest Diagnostics'
anticipated market capitalization and net book value are market uncertainty
around the impact of increased government regulation and enforcement and growth
in managed care. These factors, as well as recent highly-publicized government
settlements, have created a negative sentiment in the market which management
believes is temporarily depressing the market value for publicly-traded clinical
laboratory companies. See Note 15 to the Audited Quest Diagnostics Financial
Statements.
    


   In October 1995, the Financial Accounting Standards Board issued Statement 
No. 123, "Accounting for Stock- Based Compensation" ("SFAS 123"). This 
statement defines a fair value-based method of accounting for employee stock 
options and similar equity investments and encourages adoption of that method 
of accounting for employee stock compensation plans. However, it also allows 
entities to continue to measure compensation cost for employee stock 
compensation plans using the intrinsic value-based method of accounting 
prescribed by APB Opinion No. 25, "Accounting for Stock Issued to Employees" 
("APB 25"). Entities which elect to continue accounting for stock 
compensation plans utilizing APB 25 are required to disclose pro forma net 
income and earnings per share, as if the fair value-based method of 
accounting under SFAS 123 had been applied. Quest Diagnostics intends to 
account for stock compensation plans pursuant to APB 25 and, as such, will 
include the pro forma disclosures required by SFAS 123 in the financial 
statements beginning in 1996. 

Inflation 

   Quest Diagnostics believes that inflation generally does not have a 
material adverse effect on its operations or financial condition because 
substantially all of its contracts are short-term. 

                                      59 
<PAGE> 

                          BUSINESS OF QUEST DIAGNOSTICS

Overview 

   Quest Diagnostics is one of the largest clinical laboratory testing 
companies in the United States, offering a broad range of routine and 
esoteric testing services used by the medical profession in the diagnosis, 
monitoring and treatment of disease and other medical conditions. Quest 
Diagnostics currently processes approximately 60 million requisitions each 
year. 

   Quest Diagnostics is the successor by merger to MetPath Inc. ("MetPath"), 
a New York corporation organized in 1967. Corning acquired MetPath in 1982 
and in 1992 merged MetPath into Quest Diagnostics, which had been organized 
in 1990 as a holding company for the clinical laboratory testing business and 
contract research business. In 1994, Quest Diagnostics expanded its presence 
in the esoteric testing market through the acquisition of Nichols Institute, 
now known as Corning Nichols Institute ("Nichols"), which is one of the 
leading esoteric clinical laboratories in the world. Upon the consummation of 
the Distributions, Corning Clinical Laboratories Inc. will adopt the name 
Quest Diagnostics Incorporated. 

   Since its founding in 1967, Quest Diagnostics' clinical laboratory testing 
business has grown into a network of 17 regional laboratories across the 
United States, the Nichols esoteric testing laboratory in San Juan 
Capistrano, California and one branch laboratory in Mexico City. In addition, 
Quest Diagnostics has 14 smaller branch laboratories, approximately 200 
"STAT" laboratories and approximately 850 patient service centers located 
throughout the United States. A substantial portion of this growth has 
resulted from acquisitions. See "--Acquisitions and Dispositions." 

Recent Organizational Changes 

   Between 1990 and 1995, Corning tripled the size of its clinical laboratory 
testing business, principally through acquisitions. Historically, prior 
management pursued a strategy of growth through acquisitions, including 
diversification outside of the clinical laboratory testing business. As a 
result of difficult integrations and increased pricing pressures and 
regulatory complexity in the clinical testing industry, a new strategy was 
needed. In May 1995, Corning responded by appointing Kenneth Freeman, then an 
Executive Vice President of Corning, as President and Chief Executive Officer 
of Quest Diagnostics, who was charged with the responsibility to formulate a 
new strategy. Mr. Freeman has over 24 years of key financial and managerial 
experiences at Corning, including serving as the general manager of Corning's 
science products division and the President and Chief Executive Officer of 
Corning Asahi Video Products Company. Under Mr. Freeman's leadership, 
profitability of these operations increased. 

   Mr. Freeman immediately suspended Quest Diagnostics' acquisition program. 
Under his direction, Quest Diagnostics began to refocus on its core clinical 
laboratory testing business and reorganize its senior management team. As a 
result, Quest Diagnostics is implementing the best practices in each region 
throughout Quest Diagnostics; standardizing processes and systems; analyzing 
the cost of serving various customers; intensifying efforts to correct 
persistent billing errors to both enhance customer satisfaction and reduce 
the cost of billing operations; enhancing its compliance program to audit and 
correct system defaults and to better train employees in the laws and rules 
governing the industry; and improving communications with employees by 
improving systems and the kind and amount of current information available to 
employees. 

   Mr. Freeman revamped the senior management team by appointing four new 
senior executives and changing the responsibilities of five other senior 
executives. Additionally, approximately one-half of the existing laboratory 
facility general managers were replaced. 


   Mr. Freeman also changed the management structure, appointing three of the 
senior executives to newly created key positions--Douglas VanOort, who will 
focus exclusively on laboratory operations, Don Hardison, who will focus on 
commercial activities, and Dr. Gregory Critchfield, who will lead the efforts 
in the science and medical areas and pursue innovations. All three report 
directly to Mr. Freeman. See "Management of Quest Diagnostics--Management-- 
Executive Officers of Quest Diagnostics." Quest Diagnostics believes that 
this new management structure will greatly enhance Quest Diagnostics' ability 
to pursue its business strategy. Mr. VanOort and the regional and facility 
operations leaders who report to him will focus their primary attention on 
laboratory operations, efficiencies and standardization. Mr. Hardison and the 
regional and local commercial leaders who report to him will develop and 
coordinate national, regional and local sales and marketing efforts, and will 
cultivate national and regional client relationships and provider 



                                      60 
<PAGE> 

alliances. Dr. Critchfield will pursue scientific excellence in the 
laboratory as well as seek out, develop and assimilate those new tests and 
technologies that will differentiate Quest Diagnostics and propel its growth 
in the future. 

   This three-prong management structure is designed to implement Quest 
Diagnostics' business strategy to make Quest Diagnostics the best supplier 
(i.e., lowest-cost, highest quality) of quality testing services; the 
preferred provider of fairly priced and useful health care services and 
information; and the industry's leading innovator of new clinical tests, 
methodologies and services. 

Business Strategy 


   Quest Diagnostics' overall goal is to be recognized by its customers, 
employees and competitors as the best provider of comprehensive and 
innovative clinical testing, information and services. To achieve this, Quest 
Diagnostics has set several strategic goals and put in place organizational 
structures to implement them. 


   Best Supplier. Quest Diagnostics seeks to be the best supplier of the 
highest quality and the lowest-cost testing services. Health care providers 
and patients expect accurate, timely and consistent laboratory test results 
at a fair price. 

   (bullet) Lowest Cost Provider. Currently, approximately 28% of Quest 
            Diagnostics' net revenues are from laboratories that Quest 
            Diagnostics believes are the lowest cost providers in their 
            respective markets. Management believes that these laboratories 
            are the lowest cost providers in their respective markets based 
            on its knowledge of such markets and information obtained in 
            acquiring other laboratories. Quest Diagnostics currently 
            receives approximately 60 million requisitions for testing each 
            year. Currently, Quest Diagnostics' average cost per requisition 
            varies significantly among its regional laboratories: an 
            approximately $7.00 difference in cost per requisition between 
            the most efficient regional laboratory and the average and an 
            approximately $13.00 difference in cost per requisition between 
            the most and the least efficient regional laboratories. In many 
            cases, these variations do not relate to testing volumes or 
            mixes, space costs, service requirements or regional labor cost 
            differences. To reduce costs, Quest Diagnostics has begun to 
            replicate the best practices from each region throughout its 
            national network. Standardization of equipment and supplies, as 
            well as leveraging of Quest Diagnostics' purchasing power, is 
            also part of this strategy. While Quest Diagnostics' overall 
            program of standardization is in a preliminary stage, Quest 
            Diagnostics has already selected its standard clinical 
            instruments and has selected its national vendors for laboratory 
            supplies, temporary services and personal computers. Management 
            expects to achieve significant cost savings within the next three 
            years as these programs are fully implemented, the majority of 
            which are expected to be achieved by the end of 1998. * 

   (bullet) Highest Quality Provider. Quest Diagnostics is dedicated to 
            providing accurate and timely testing results and to being viewed 
            by its customers as the highest quality provider of clinical 
            testing services. Quest Diagnostics believes that implementation 
            of best practices already developed in certain regions will 
            permit Quest Diagnostics to be viewed by its customers as the 
            highest quality provider of clinical testing services. For 
            example, as part of its best practices policy, Quest Diagnostics 
            is identifying the most common service failures in each regional 
            laboratory and establishing procedures to substantially reduce 
            these service failures. Management believes that implementing 
            these best practices will increase the level of quality while 
            lowering costs.** Historically, Quest Diagnostics' experience has 
            been that the regions with the highest quality of services have 
            also had the lowest costs. 

   Preferred Provider. Quest Diagnostics seeks to be the preferred provider 
of laboratory testing services to existing and new health care networks on a 
selective basis determined by profitability of accounts. Quest Diagnostics 
believes that it will become the preferred provider to these networks as (1) 
large networks typically prefer to utilize large independent clinical 
laboratories that can service them on a national or regional basis and (2) 
Quest Diagnostics continues to pursue its primary strategy of becoming the 
highest quality, lowest cost provider. To achieve this, Quest Diagnostics 
will employ a rigorous national and regional process to identify prospective 
customers and to efficiently 


 * This is a forward looking statement and is based on current expectations. 
   sults may vary materially from those projected. See "--Important Factors 
   Regarding Forward Looking Statements." In particular see factors (c), (d), 
   (g) and (j). 
** This is a forward looking statement and is based on current expectations. 
   Actual results may vary materially from those projected. See "--Important 
   Factors Regarding Forward Looking Statements." In particular see factors 
   (b), (c), (d), (f) and (j). 


                                      61 
<PAGE> 



allocate resources to support these efforts. Quest Diagnostics will also pursue
innovative alliances and seek to assist its partners in achieving their business
objectives.



   (bullet) Account Profitability. Quest Diagnostics intends to refocus its 
            sales efforts on pursuing and keeping profitable accounts. Quest 
            Diagnostics is engaging in an active program with current 
            accounts, including those with managed care organizations, to 
            evaluate their profitability and either increase pricing or 
            eliminate accounts that cannot be serviced profitably. Throughout 
            the independent clinical laboratory industry, there are 
            substantial differences in pricing among, as well as the cost of 
            serving, various categories of payors and health care providers. 
            Quest Diagnostics is beginning to provide clear pricing 
            guidelines to its sales force and changing its commission 
            structure so that compensation is tied to the profitability of 
            (rather than revenues from) new business. Management expects to 
            achieve significant benefits from these programs within the next 
            three years, the majority of which are expected to be achieved by 
            the end of 1998. * 

   (bullet) Regional Profitability. Quest Diagnostics presently believes that 
            it has the leading market share among independent clinical 
            laboratories in most routine testing markets of the northeast, 
            mid-Atlantic and midwest regions. Approximately 65% of Quest 
            Diagnostics' revenues and almost all of its EBITDA is generated 
            from markets in which Quest Diagnostics believes that it has the 
            leading market share. In most of these markets, Quest Diagnostics 
            believes that it also is the lowest cost provider. Quest 
            Diagnostics is evaluating its strategic alternatives relative to 
            units whose profitability does not meet its internal goals. These 
            alternatives may include joint ventures, alliances, or 
            dispositions. Quest Diagnostics believes that, while the clinical 
            laboratory industry is becoming national in scope, Quest 
            Diagnostics can subcontract with other clinical laboratories to 
            perform testing for national accounts in any markets in which 
            Quest Diagnostics chooses not to compete. Quest Diagnostics may 
            also make selected local acquisitions where appropriate. 

   Leading Innovator. Quest Diagnostics intends to remain a leading innovator 
in the clinical laboratory industry by continuing to introduce new tests, 
technology and services. Through its relationship with the academic community 
and pharmaceutical and biotechnology firms and a research and development 
budget exceeding $15 million per year, Quest Diagnostics believes it is one 
of the leaders in transferring innovation from academic biotechnology 
laboratories to the market. For example, Quest Diagnostics (through its 
subsidiary Nichols) has been informed by its licensors that it is currently 
the only independent clinical laboratory that is using both molecular signal 
amplification (branched DNA) and polymerase chain reaction (PCR) technologies 
for HIV testing. These technologies permit the detection of lower levels of 
HIV than can be achieved using other technologies, which in turn permits 
health care providers to better tailor drug therapies for HIV-infected 
patients. Nichols continues to be one of the leading esoteric testing 
laboratories in the world. Nichols serves approximately 2,000 of the 
country's estimated 6,400 hospitals and counts among its largest customers 
both LabCorp and SmithKline. Quest Diagnostics hopes to leverage Nichols' 
existing relationships with hospitals into increased routine testing to 
hospitals, which continue to perform over half of the clinical laboratory 
testing in the United States. 

The Clinical Laboratory Testing Industry 

   Clinical testing is a critical component in the delivery of quality health 
care service to patients. Currently, clinical laboratory testing is the first 
step in determining how a significant amount of all health care dollars are 
spent. Laboratory tests and procedures are used generally by physicians and 
other health care providers to assist in the diagnosis, evaluation, 
monitoring and treatment of diseases and other medical conditions through the 
measurement and analysis of chemical and cellular components in blood, 
tissues and other specimens. Clinical laboratory testing is generally 
categorized as either clinical testing, which is performed on body fluids 
such as blood and urine, or anatomical pathology testing, which is performed 
on tissue and other samples, including human cells. Clinical and anatomical 
pathology procedures are frequently ordered as part of regular physician 
office visits and hospital admissions. Most clinical laboratory tests ordered 
by health care providers are considered "routine" and can be performed by 
most independent clinical laboratories, while "esoteric" tests (which 
generally require more sophisticated equipment, materials and personnel) are 
generally referred to laboratories, such as the Nichols facility in San Juan 
Capistrano, that specialize in such tests. 

   Quest Diagnostics believes that in 1995 the entire United States clinical 
laboratory industry had revenues exceeding $30 billion. The clinical 
laboratory industry consists primarily of three types of providers: hospital- 
affiliated laboratories, independent clinical laboratories, such as those 
owned by Quest Diagnostics, and physician- 

- ------------- 
* This is a forward looking statement and is based on current expectations. 
  Actual results may vary materially from those projected. See "--Important 
  Factors Regarding Forward Looking Statements." In particular see factors 
  (a), (b), (c), (d), (f) and (i). 

                                      62 
<PAGE> 


  office laboratories. Quest Diagnostics believes that in 1995 approximately 
  56% of the clinical testing revenues in the United States were attributable 
  to hospital-affiliated laboratories, approximately 36% were attributable to 
  independent clinical laboratories and approximately 8% were attributable to 
  physicians in their offices and laboratories. 



   Quest Diagnostics believes that consolidation will continue in the 
clinical laboratory testing business. In addition, Quest Diagnostics believes 
that it and the other large independent clinical laboratory testing companies 
may have the opportunity to increase their share of the overall clinical 
laboratories testing market due to a number of external factors including 
cost efficiencies afforded by large-scale automated testing, Medicare 
reimbursement reductions and the growth of managed health care entities which 
require low-cost testing services and large service networks. In addition, 
legal restrictions on physician referrals and the ownership of laboratories 
as well as increased regulation of laboratories are expected to contribute to 
the continuing consolidation of the industry. 


   Quest Diagnostics believes that a number of factors are likely to 
positively influence the volume of clinical laboratory testing performed in 
the United States in the future, including (1) the general aging of the 
population in the United States; (2) an expanded base of scientific knowledge 
which has led to the development of more sophisticated specialized tests and 
an increase in the awareness of physicians of the value of clinical 
laboratory testing as a cost-effective means of early detection of disease 
and monitoring of treatment; (3) an increase in the number and types of tests 
which are, due to advances in technology and increased cost efficiencies, 
readily available on a more affordable basis to physicians; (4) expanded 
substance-abuse testing by corporations and governmental agencies; and (5) 
increased testing for sexually transmitted diseases such as AIDS. The impact 
of these factors is expected to be offset in part by increased controls over 
the utilization of clinical laboratory tests by both Medicare and the private 
sector, particularly managed care organizations. 

   Quest Diagnostics believes that the clinical laboratory industry will 
continue to be subject to pricing pressures as a result of (1) continued 
growth of the managed care sector; (2) a shift toward capitated payment 
contracts within the managed care sector; and (3) decreases in Medicare 
reimbursement rates. In addition, increased regulatory requirements in the 
billing of Medicare are expected to result in reimbursement reductions and 
additional costs to clinical laboratory testing companies in the United 
States. Quest Diagnostics has formulated strategies to address these 
challenges. See "--Business Strategy." 

Services 

   Quest Diagnostics' laboratory business is comprised of routine testing, 
which Quest Diagnostics management estimates currently generates 
approximately 88% of Quest Diagnostics' net revenues; and esoteric testing, 
which is performed at the Nichols facility in San Juan Capistrano and which 
Quest Diagnostics management estimates generates approximately 10% of Quest 
Diagnostics' net revenues. The balance of Quest Diagnostics' net revenues is 
derived principally from the manufacture of clinical laboratory test kits. 

   Routine Testing Services and Operations. Routine tests, which are 
performed at Quest Diagnostics' regional laboratories, include procedures in 
the area of blood chemistry, hematology, urine chemistry, virology, tissue 
pathology and cytology. Commonly ordered individual tests include red and 
white blood cell counts, Pap smears, blood cholesterol level tests, 
AIDS-related tests, urinalyses, pregnancy tests, and alcohol and other 
substance-abuse tests. Routine test groups include tests to determine the 
function of the kidney, heart, liver and thyroid, as well as other organs, 
and several health screens that measure various important bodily health 
parameters. 

   Quest Diagnostics provides services through 17 regional laboratories 
located in major metropolitan areas throughout the United States, as well as 
14 branch laboratories, approximately 200 STAT laboratories and 850 patient 
service centers. Quest Diagnostics also operates a branch laboratory in 
Mexico. Regional laboratories offer a full line of routine clinical testing 
procedures. "STAT" laboratories are local laboratory facilities where Quest 
Diagnostics can quickly perform and report results of certain routine tests 
for customers that require such emergency testing services. "Branch 
laboratories" have a test menu that is smaller than that of regional 
laboratories but larger than that of STAT laboratories. A "patient service 
center" is a facility maintained by Quest Diagnostics, typically in or near a 
medical professional building, to which patients can be referred by 
physicians for specimen collection. 

   Quest Diagnostics operates 24 hours a day, 365 days a year, utilizing a 
fully integrated collection and processing system. Quest Diagnostics 
generally performs and reports most routine procedures within 24 hours, 
employing a variety of sophisticated and computerized laboratory testing 
instruments. On an average work day, Quest Diagnostics processes 
approximately 220,000 requisitions. Quest Diagnostics provides daily pickup 
of specimens from most customers principally through an in-house courier 
system. The specimens are sent to one of Quest Diagnostics' laboratories 
(generally a regional or branch laboratory) where one or more tests are 
performed. 

                                      63 
<PAGE> 

   Each patient specimen is accompanied by a test requisition form, which is 
completed by the customer, that indicates the tests to be performed and 
provides the necessary billing information. Each specimen and related 
requisition form is checked for completeness and then given a unique 
bar-coded identification number. The unique identification number assigned to 
each specimen helps to assure that the results are attributed to the correct 
patient. The requisition form is sent to a data entry department where a file 
is established for each patient and the necessary testing and billing 
information is entered. Once this information is entered into the computer 
system, the tests are performed and the results are entered, primarily 
through computer interface or manually, depending upon the type of testing 
equipment involved. Most of Quest Diagnostics' computerized testing equipment 
is directly linked with Quest Diagnostics' information systems. Most routine 
testing is performed and completed during the evening following receipt of 
the specimens to be tested, and test results are readied for distribution the 
following morning either electronically or by service representatives. Many 
customers have local printer capability enabling laboratory medical reports 
to be printed in their offices. Customers who request that they be called 
with a result are so notified in the morning. It is Quest Diagnostics's 
policy to notify the customer immediately if a life-threatening result is 
found at any point during the course of the testing process. 

   Esoteric Testing Services and Operations. Through Nichols, Quest 
Diagnostics operates one of the leading esoteric clinical testing 
laboratories in the world. Esoteric tests are performed in cases where the 
information provided by routine tests is not specific enough or is 
inconclusive as to the existence or absence of disease or when a physician 
requires more information. Typically, unlike routine testing, only one test 
is performed per requisition. The logistics for esoteric testing are similar 
to that for routine testing except that, due to the complexity of the 
testing, approximately 60% of the tests are performed within 24 hours, with 
almost all of the rest being performed within one week. During 1995 Nichols 
performed approximately 3.9 million esoteric tests, of which 77% were 
referred by sources other than Quest Diagnostics regional laboratories. 

   Esoteric tests generally require more sophisticated equipment and 
materials as well as more highly skilled personnel to perform test procedures 
and analyze results than what is required for routine testing. Consequently, 
esoteric tests are generally priced substantially higher than routine tests. 
New medical discoveries lead to the development of new esoteric tests. 
However, over time esoteric tests may become routine tests as a result of 
improved technology or increased volume. The volume of esoteric tests 
required by most health care providers, including hospitals, is relatively 
low compared to the volume of routine tests. Because it is generally not cost 
effective for such health care providers to perform the low volume of 
esoteric tests in-house, a significant portion of esoteric tests are referred 
to clinical laboratories like Nichols that specialize in such tests. Some 
examples of esoteric testing procedures include capillary electrophoresis, 
cell culture technology, chemiluminescent immunoassays, certain enzyme 
immunoassays, flow cytometry, fluorescent in situ hybridization (FISH), 
inductively coupled plasma mass spectroscopy (ICPMS), molecular tissue 
pathology, molecular signal amplification (branched DNA), and polymerase 
chain reaction (PCR) technologies. 


   Nichols's laboratory is comprised of 18 individual laboratory departments, 
which in the aggregate offer approximately 1,400 individual tests or "assays" 
in such fields as endocrinology, genetics, immunology, microbiology, 
molecular biology, oncology, serology, special chemistry and toxicology. 
Nichols believes that it has been one of the leaders in transferring 
technological innovation from academic biotechnology laboratories to the 
marketplace. Nichols was the first to introduce a number of esoteric tests, 
including immunoassay methods for measurement of circulating hormone levels 
and sensitive tests to predict breast cancer prognosis. Among more recent 
developments have been tests to detect a variety of tumor types, a common 
form of mental retardation, leukemia, cystic fibrosis, osteoporosis, 
hepatitis and neurological disorder and to monitor success of therapy in 
cancer and AIDS. The branched DNA and PCR technologies can be applied to a 
variety of infectious agents and permit the detection of lower levels of HIV 
than can be achieved under other technologies. The ability to measure the 
amount of HIV permits health care providers to better tailor drug therapies 
for HIV-infected patients. As part of its research and development efforts, 
Nichols maintains a relationship with the academic community through its 
Academic Associates program, under which approximately sixty scientists from 
academia and biotechnology firms work directly with Nichols's staff 
scientists to monitor and consult on existing test procedures and develop new 
esoteric test methods. In addition, Nichols relies on internal resources for 
the development of new tests as well as on license arrangements and 
co-development agreements with biotechnology companies and academic medical 
centers. 


   Nichols also provides clinical laboratory testing in connection with 
pre-marketing clinical trials of pharmaceutical drugs. This testing is 
competitive with the testing performed by a subsidiary of Covance and is 
expected to continue in the future. Quest Diagnostics management estimates 
that net revenues from such testing accounted for less than 1% of Quest 
Diagnostics' net revenues in 1995. 

                                      64 
<PAGE> 

   Diagnostics. Through its Nichols Institute Diagnostics ("NID") 
subsidiaries, which were acquired as a result of the acquisition of Nichols 
Institute in August 1994, Quest Diagnostics manufactures and markets clinical 
laboratory kits primarily for esoteric testing. Test kits are sold 
principally to hospital and clinical laboratories. 

Customers and Payors 

   Quest Diagnostics provides testing services to a broad range of health 
care providers. The primary types of customers served by Quest Diagnostics 
are as follows: 

   Independent Physicians and Physician Groups. Physicians requesting testing 
for their patients who are unaffiliated with a managed care plan remain the 
principal source of Quest Diagnostics' clinical laboratory business. Fees for 
clinical laboratory testing services rendered for these physicians are billed 
either to the physician, to the patient, or to the patient's third-party 
payor such as insurance companies, Medicare and Medicaid. In four states, 
including New York and Michigan, Quest Diagnostics is required to bill 
patients directly. The clinical laboratory industry is supporting legislative 
efforts to expand direct patient billing. Billings are typically on a 
fee-for-service basis. If the billings are to the physician, they are based 
on the laboratory's wholesale or customer fee schedule and are typically 
subject to negotiation. Otherwise, the billings are based on the laboratory's 
retail or patient fee schedule, subject to limitations on fees imposed by 
third parties and to negotiation by physicians on behalf of their patients. 
Medicare and Medicaid billings are based on fee schedules set by governmental 
authorities. See "-- Regulation and Reimbursement." 

   HMOs and Other Managed Care Groups. HMOs and other managed care 
organizations typically contract with a limited number of clinical 
laboratories and then designate the laboratory or laboratories to be used for 
tests ordered by their participating physicians. In an effort to control 
costs, the managed care groups generally negotiate discounts to the fees 
usually charged by such laboratories. Most testing for managed care 
organizations is being performed on a capitated basis. Under a capitated 
payment contract, the clinical laboratory and the managed care organization 
agree to a monthly payment per covered individual to cover all laboratory 
tests during the month, regardless of the number or cost of tests actually 
performed. Such contracts shift the risks of additional routine testing 
beyond that covered by the capitated payment to the clinical laboratory. In 
certain cases, however, the monthly payment may be subject to prospective or 
retroactive adjustment if the number of tests performed exceeds (or is less 
than) certain thresholds. The types of tests covered by capitated contracts 
are negotiated for each contract, with esoteric tests and anatomic pathology 
services generally not being covered under the capitation rate. Large 
regional and national HMOs and preferred provider organization networks 
typically prefer to utilize large independent clinical laboratories such as 
Quest Diagnostics that can service the managed care groups on a national or 
regional basis. See "--Effect of the Growth of the Managed Care Sector on the 
Clinical Laboratory Business." 

   Hospitals. Quest Diagnostics serves approximately 3,000 hospitals with 
services that vary from providing esoteric testing to management contracts, 
where Quest Diagnostics manages the hospital's laboratory for a fee. 
Hospitals generally maintain an on-site laboratory to perform testing on 
patients receiving care and refer less frequently needed procedures to 
outside laboratories. Hospitals are typically charged for such tests a 
negotiated fee-for-service which is based on the laboratory's customer fee 
schedule. Some hospitals actively encourage community physicians to send 
their testing to the hospital's laboratory. In addition, some hospitals have 
been purchasing physician practices and requiring that the 
physicians/employees send their testing to the hospital's affiliated 
laboratory. As a result, hospital-affiliated laboratories can be both a 
customer and a competitor for independent clinical laboratories such as Quest 
Diagnostics. 

   Other Institutions. Quest Diagnostics also serves other institutions, 
including governmental agencies, such as the Department of Defense and prison 
systems, large employers and independent clinical laboratories that do not 
have the full range of Quest Diagnostics' testing capabilities. These 
institutions are typically charged on a negotiated or bid fee-for- service 
basis. Quest Diagnostics' services to employers principally involve the 
provision of substance abuse testing services. 

   In 1995, no single customer or affiliated group of customers accounted for 
more than 2% of Quest Diagnostics' net revenues. Quest Diagnostics believes 
that the loss of any one of its customers would not have a material adverse 
effect on Quest Diagnostics' results of operations or cash flows. 

   Payors. Most clinical laboratory testing is billed to a party other than 
the "customer" that ordered the test. Tests performed for various patients of 
a single physician may be billed to different payors besides the ordering 
physician, including third-party payors (generally an insurance company or 
managed care organization), Medicare, Medicaid or the patient. 

                                      65 
<PAGE> 

   The following table sets forth current estimates of the breakdown by payor 
of Quest Diagnostics' total volume of requisitions and average approximate 
revenues per requisition: 

<TABLE>
<CAPTION>
                                              Requisition Volume 
                                                      as 
                                                  % of Total         Revenue Per Requisition 
                                              -------------------   ------------------------ 
<S>                                                   <C>                    <C>
Patient                                                5%-10%                $60-$80 
Medicare & Medicaid                                   20%-25%                $20-$25 
Monthly Bill 
 (Physician, Hospital, Employer, Other)               35%-40%                $15-$35 
Third Party Fee-For-Service                           15%-20%                $30-$40 
Managed Care--Capitated                               15%-20%                $ 5-$15 
</TABLE>

   For a discussion of the mix shift and the impact of the managed care 
sector on volume and price trends, see "--Effect of the Growth of the Managed 
Care Sector on the Clinical Laboratory Business." 

   Average Revenue per Requisition Trends. Since the fourth quarter of 1995, 
declines in Quest Diagnostics' average revenue per requisition have 
moderated. Average revenue per requisition for the quarter ended September 
30, 1996 was approximately 1.7% below the comparable period in 1995. This 
decline in revenue per requisition was smaller than the approximate 4.8% and 
3.6% decline experienced in the first and second quarters of 1996, 
respectively. Since August of 1995, the company-wide average revenue per 
requisition has remained relatively stable and is effectively unchanged 
during the first three quarters of 1996. This trend is illustrated by the 
following chart: 

[REPRESENTATION OF A LINE CHART GRAPHIC]

Average Revenue per Requisition as a Percentage
of December 1994 Revenue per Requisition

Q1/95  98.6
Q2/95  97.6
Q3/95  95.8
Q4/95  95.1
Q1/96  93.9
Q2/96  94.1
Q3/96  94.2


Sales and Marketing 

   Quest Diagnostics markets and services its customers through its direct 
sales force of approximately 430 sales representatives, 300 account 
representatives and 2,200 couriers. 

   Most sales representatives market the mainstream or traditional routine 
laboratory services primarily to physicians, while others concentrate on 
individual market segments, such as hospitals or managed care organizations, 
or on testing niches, such as substance abuse testing. Quest Diagnostics' 
sales representatives are compensated through a combination of salaries, 
commissions and bonuses, at levels commensurate with each individual's 
qualifications and responsibilities. Commissions are based primarily upon the 
individual's results in generating new business for Quest Diagnostics. Quest 
Diagnostics is currently changing its commission structure so that 
compensation is tied to the profitability of (rather than revenues from) new 
business. See "--Business Strategy--Preferred Provider." 

   Quest Diagnostics' account representatives interact with customers on an 
ongoing basis. Account representatives monitor the status of services being 
provided to customers, act as problem-solvers, provide information on new 
testing developments and serve as the customer's regular point of contact 
with Quest Diagnostics. Account representatives are compensated with a 
combination of salaries and bonuses commensurate with each individual's 
qualifications and responsibilities. 

   Quest Diagnostics believes that the clinical laboratory service business 
is shifting away from the traditional direct sales structure and into one in 
which the purchasing decisions for laboratory services are increasingly made 

                                      66 
<PAGE> 

by managed care organizations, integrated health delivery systems, insurance 
plans, employers and by patients themselves. In view of these changes, Quest 
Diagnostics has completed a rigorous regional market strategy process and has 
reorganized its sales and marketing organization structure to support these 
strategies and emerging customers. 

   Quest Diagnostics believes that, given the increasing regulation and 
complexity of the clinical laboratory marketplace, training of its sales 
force is of paramount importance. With this goal in mind, during 1995 Quest 
Diagnostics enhanced its comprehensive sales training program and compliance 
training. See "--Compliance Program." 

Effect of the Growth of the Managed Care Sector on the Clinical Laboratory 
Business 

   The managed care industry is growing as well as undergoing rapid 
consolidation which has created large managed care companies that control the 
delivery of health care services for millions of people, and have significant 
bargaining power in negotiating fees with health care providers, including 
clinical laboratories. Quest Diagnostics believes that there are potential 
opportunities for large, low-cost, clinical laboratories such as Quest 
Diagnostics to capture additional testing volume from managed care 
organizations. The larger regional and national managed care organizations 
typically prefer to utilize large independent clinical laboratories, like 
Quest Diagnostics, that can service their organizations on a national or a 
regional basis. In addition, smaller laboratories are unlikely to be able to 
achieve the low cost structures necessary to profitably service managed care 
organizations. 

   The growth of the managed care sector presents various challenges to 
independent clinical laboratories, including Quest Diagnostics. Managed care 
organizations typically negotiate capitated payment contracts, whereby the 
clinical laboratory receives a monthly fee per covered individual. The fixed 
monthly payment generally covers all laboratory tests (excluding certain 
tests, such as esoteric tests and anatomic pathology services) performed 
during the month, regardless of the number or cost of the tests performed. 
Unlike fee-for-service indemnity insurance, such contracts shift the risks of 
additional routine testing beyond that covered by the capitated payment to 
the clinical laboratory. In certain cases, however, the monthly payment may 
be subject to prospective or retroactive adjustment if the number of tests 
performed exceeds (or is less than) certain thresholds. Quest Diagnostics 
expects the amount of clinical laboratory testing performed for managed care 
organizations under capitated rate agreements to continue to grow. 

   Laboratory services agreements with managed care organizations have 
historically been priced aggressively due to competitive pressures and the 
expectation that a laboratory would capture not only the volume of testing to 
be covered under the contract, but also the additional fee-for-service 
business from patients of participating physicians who are not covered under 
the managed care plan. However, as the number of patients covered under 
managed care plans continues to increase, there is less such fee-for-service 
business and, accordingly, less high margin business to offset the low margin 
(and often unprofitable) managed care business. Furthermore, increasingly, 
physicians are affiliated with more than one managed care organization and as 
a result may be required to refer clinical laboratory tests to different 
clinical laboratories, depending on the coverage of their patients. As a 
result, a clinical laboratory might not receive any fee-for-service testing 
from such physicians. The level of pricing charged to managed care 
organizations, including under capitated payment contracts, if continued, may 
adversely affect the pricing of the clinical laboratory industry. 

   During the nine months ended September 30, 1996, services to managed care 
organizations under capitated rate agreements accounted for approximately 6% 
of Quest Diagnostics' net revenues from clinical laboratory testing and 
approximately 15% of the number of tests performed by Quest Diagnostics. 
Quest Diagnostics believes that the prices charged by the independent 
clinical laboratory testing companies to managed care organizations can and 
must be increased. Quest Diagnostics is currently reviewing its pricing 
structures for agreements with managed care organizations and intends to 
insure that all such agreements are profitably priced. However, there can be 
no assurance that Quest Diagnostics will be able to increase the prices 
charged to managed care organizations or that Quest Diagnostics will not lose 
market share in the managed care market to other clinical laboratories who 
continue to aggressively price laboratory services agreements with managed 
care organizations. Quest Diagnostics believes that the growth of the managed 
care sector presents both challenges and opportunities. Quest Diagnostics, as 
part of its preferred provider strategy, will seek to capitalize on the 
opportunity and meet the challenge by seeking to secure large-volume, 
profitable managed care contracts through providing low cost, high quality 
testing services at rational prices. 

                                      67 
<PAGE> 

Expansion Opportunities 

   Quest Diagnostics believes that there are several expansion opportunities. 
Quest Diagnostics believes that it can take advantage of these opportunities 
without incurring significant capital expenditures or deploying significant 
resources. 

   Hospital Alliances. In response to the growth of the managed care sector 
and the developments described under "--Effect of the Growth of the Managed 
Care Sector on the Clinical Laboratory Business," many health care providers 
have established new alliances. Hospital-physician networks are emerging in 
many markets in order to offer comprehensive, integrated service 
capabilities, either to managed care plans or directly to employers. 

   Since Quest Diagnostics has traditionally derived a substantial portion of 
its esoteric testing revenues from referrals from hospitals, which perform 
approximately half of all clinical laboratory tests in the United States, 
Quest Diagnostics established a hospital business venture group whose primary 
goal is to develop additional nontraditional hospital arrangements, including 
management and consulting agreements, shared service arrangements and joint 
ventures. 

   Under federal cost containment legislation enacted in 1985, treatment 
provided to hospital inpatients covered by Medicare is classified into 
diagnosis-related groups ("DRGs") which prescribe the maximum reimbursable 
payments for all services, including laboratory testing services, provided on 
behalf of an inpatient under each DRG. As a result of this payment structure, 
and similar price constraints from managed care organizations and other 
third- party payors, hospitals have an economic incentive to seek the most 
cost-effective laboratory testing services for their patients. Quest 
Diagnostics believes that in many cases, by managing a hospital laboratory or 
entering into a joint venture with a hospital, Quest Diagnostics can improve 
a hospital laboratory's economic structure and preserve hospital capital that 
would be required for needed laboratory improvements while providing accurate 
and timely testing services due to greater economies of scale, increased 
utilization of expensive testing and data processing equipment through 
optimization of the mix between on-site and off-site testing and more 
efficient use of laboratory employees. Quest Diagnostics has several such 
arrangements with hospitals, including a joint venture with two hospitals in 
Erie, Pennsylvania that performs outreach testing and a management agreement 
with a group of approximately 25 hospitals in eastern Nebraska and Sioux 
City, Iowa. These two laboratory arrangements, which provide testing for both 
the hospitals and the commercial outreach markets in their geographical 
areas, serve as two of Quest Diagnostics' laboratory facilities. Quest 
Diagnostics also manages the laboratories at several hospitals in the eastern 
United States. However, despite the potential cost savings and additional 
revenues available to hospitals through such arrangements, Quest Diagnostics 
believes that only a small percentage of the hospitals in the United States 
have entered into such arrangements with independent clinical laboratories. 
Nonetheless, Quest Diagnostics expects to enter into alliances with various 
hospitals in the future and believes that this market has potential. As an 
alternative service for hospitals that are entering into integrated delivery 
systems, Quest Diagnostics is beginning to market consulting support and 
technical solutions for integrating diverse laboratory infrastructures, 
systems and data. 

   Employer Market. Quest Diagnostics is considering expanding its business 
in the employer market to include the provision of laboratory services to 
large employers on a basis comparable to that offered to managed care 
organizations, whereby laboratory services paid under self-insured indemnity 
plans may be relatively fixed (rather than on a fee-for-service basis). These 
services could be offered in alliance with other service providers, including 
pharmaceutical benefits and diagnostic imaging services. Quest Diagnostics 
recently organized National Imaging Associates Inc. ("NIA"), a company 
offering diagnostic imaging benefit management services to employers, payors 
and managed care organizations. NIA seeks to carve out the imaging component 
of a health care plan service offering and manage it at lower cost through 
utilization controls and provider price concessions. 


   Medical Information.  The market need for medical information, 
particularly disease-specific information about provider practices and 
patient care, is growing rapidly. Large customers of clinical laboratories 
are increasingly interested in using information from clinical laboratory 
data on their covered population to answer financial, marketing and quality 
related questions. Integrated data from clinical laboratories and other 
health encounters provides additional insights to these questions. To meet 
these emerging needs, Quest Diagnostics created the Medical Informatics 
("Medical Informatics") division which focuses solely on the medical 
information needs of managed care organizations, integrated healthcare 
delivery networks and other large customers. Through internal development, 
Quest Diagnostics now has a portfolio of information products based primarily 
upon its extensive database. A combination of advanced information technology 
and experienced analytical and data integration skills provides the platform 
for delivery of these products. 



                                      68 
<PAGE> 





   As market interest has increased, the Medical Informatics division has 
devoted experienced account executives to work with customers to meet their 
information needs. Current information products include provider profiles and 
benchmarks, high-risk patient registries based on customer disease management 
initiatives, normative comparisons with other populations, and quantitative 
clinical outcomes based on laboratory measures. Quest Diagnostics believes 
that health care customers will increasingly see value in the information 
obtained from clinical laboratory results. 




Information Systems 


   The need for information systems to support laboratory, billing, customer 
service, logistics, medical data, and other business requirements is 
significant and will continue to place high demands on Quest Diagnostics' 
information systems staff. Quest Diagnostics has historically not 
standardized the billing, laboratory and other information systems at 
laboratories that it has acquired. As a result, Quest Diagnostics has 
numerous different information systems to handle billing, test result 
reporting and financial data and transactions. Quest Diagnostics believes 
that the efficient handling of information involving customers, patients, 
payors, and other parties will be critical to Quest Diagnostics' future 
success. 


   To this end, Quest Diagnostics has chosen standard billing and laboratory 
systems. During the third quarter of 1996, Quest Diagnostics recorded a 
charge of $13.7 million to write off capitalized software as a result of its 
decision to abandon the billing system which had been intended as its 
company-wide billing system. Management now plans to standardize using a SYS 
billing system which has already been implemented in seven of its 22 billing 
sites, which seven sites account for 35% of Quest Diagnostics' net revenues. 
The standard laboratory system is already operational in nine of its 22 
billing sites, which account for 30% of Quest Diagnostics' net revenues. Such 
sites are not necessarily the same sites as those with standard billing 
systems. Quest Diagnostics is beginning to convert the remaining nonstandard 
billing and laboratory systems to the standard systems, prioritized on an 
impact basis. The most critical conversions will be completed within three 
years. The New York/New Jersey (Teterboro) laboratory is the first priority 
and is expected to be converted by early 1998. The conversion costs are 
expected to average approximately $3 million per billing system and $1 
million to $3 million per laboratory system. As more billing sites are 
converted to the standard billing system, consolidation of billing sites is 
expected to occur, which will reduce overall conversion costs and improve 
billing efficiencies. Quest Diagnostics anticipates that the cost of 
converting all billing and laboratory systems to the standard systems over 
the next several years will cost between approximately $55 million and $85 
million, depending on the number of billing consolidations that occur.* Quest 
Diagnostics does not anticipate that the conversion costs will result in a 
significant increase in capital expenditures over the levels spent during the 
last several years. 


   Quest Diagnostics is developing systems that will permit managed care 
organizations and other providers to have electronic access to test orders 
and results for participating physicians, which will permit managed care 
organizations to better monitor and control the utilization of testing 
services. 


Billing 


   Billing for laboratory services is a complicated process. Laboratories 
must bill different payors such as doctors, patients, insurance companies, 
Medicare, Medicaid and employer groups, all of whom have different billing 
requirements. Quest Diagnostics believes that less than 30% of its bad debt 
expense is attributable to specific credit or payment issues of its 
customers. The remainder of the bad debt expense is the result of many 
non-credit related issues which slow the billing process, create backlogs of 
unbilled requisitions and generally increase the aging of accounts 
receivable. A primary cause of bad debt expense is missing or incorrect 
billing information on requisitions. Typically approximately one-third of the 
requisitions that Quest Diagnostics receives either do not provide all the 
necessary data or provide incorrect data. Quest Diagnostics believes that 
this experience is similar to that of its primary competitors. Quest 
Diagnostics performs the requested tests and reports back the test results 
regardless of whether billing information has been provided at all or has 
been provided incorrectly. Quest Diagnostics subsequently attempts to obtain 
any missing information or rectify any incorrect billing information received 
from the health care provider. Among the many other factors complicating the 
billing process are pricing differences 

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

* This is a forward looking statement and is based on current expectations. 
  Actual results may vary materially from those projected. See "--Important 
  Factors Regarding Forward Looking Statements." In particular see factors 
  (d), (j) and (k). 

                                      69 
<PAGE> 

between the fee schedules of Quest Diagnostics and the payor, disputes between
payors as to the party responsible for payment of the bill and auditing for
specific compliance issues. Ultimately, if all issues are not resolved in a
timely manner, the related receivables are written off to bad debt expense.


   Quest Diagnostics' bad debt expense has increased each year since 1993 due 
principally to four developments that have further complicated the billing 
process: (1) increased complexity in the health care system; (2) increased 
requirements in complying with fraud and abuse regulations; (3) deterioration 
in reimbursement as the payor mix shifts; and (4) changes in Medicare 
reimbursement policies. These four factors have placed additional 
requirements on the billing process, including the need for specific test 
coding, additional research on processing rejected claims that comply with 
prior practices, increased audits for compliance, and management of a large 
number of contracts which have very different information requirements for 
pricing and reimbursement. See "Management's Discussion and Analysis of 
Financial Condition and Results of Operations of Quest Diagnostics." Quest 
Diagnostics' billing has also been hampered by the existence of multiple 
billing information systems. In 1995 Quest Diagnostics had severe billing 
problems at its largest laboratory site in Teterboro, New Jersey. A new 
billing information system developed with outside consultants experienced 
significant implementation problems, including excessive downtime, which 
severely impacted Quest Diagnostics' ability to efficiently bill for its 
services from the Teterboro location. The problem was compounded by a lack of 
experienced staff as the result of work force reductions made to meet cost 
reduction initiatives undertaken in anticipation of greater efficiencies from 
the new billing information system. As a result of all of these factors, 
Quest Diagnostics recorded a charge to bad debt of $62 million in the third 
quarter of 1995. Of this amount approximately $34 million was attributable to 
its Teterboro location. At the time of the charge, the backlog of unbilled 
requisitions was estimated at over 2 million requisitions and DSOs for the 
clinical testing business were 90 days. In addition, significant backlogs 
existed in (1) reconciling cash received to payment of specific bills, (2) 
rejected claims that needed to be researched and (3) correspondence from 
customers attempting to resolve billing problems. 


   Integration of a standardized billing system is a priority of Quest 
Diagnostics and Quest Diagnostics is in the process of integrating a billing 
system with proven reliability throughout its network. The SYS system is in 
use at seven of Quest Diagnostics' laboratories. Its reliability is evidenced 
by both the improvement in the laboratories' bad debt experience after SYS 
was implemented and the improved capability to handle new billing 
requirements as compared with non-SYS laboratories, such as Teterboro. For 
example, bad debt expense for the nine months ended September 30, 1996 for 
the combined SYS laboratories is 6.4% of sales, versus 7.1% for all other 
laboratories combined. The use of a standard system will also provide for 
operational efficiencies as redundant programming efforts are eliminated and 
the ability to consolidate billing sites will become more feasible. See 
"--Information Systems." Standardizing billing systems presents conversion 
risk to Quest Diagnostics as key databases and masterfiles are transferred to 
the SYS system and because the billing workflow is interrupted during the 
conversion, which may cause backlogs. Quest Diagnostics, however, has already 
completed seven conversions to this system and has retained key people who 
have been involved in those conversions. 

   Quest Diagnostics has focused on improving its billing operations in the 
last year. Over the last twelve months, the backlog of unbilled requisitions 
has been reduced by approximately 30%, DSOs for the clinical testing business 
have been reduced to 74 days, bad debt expense as a percentage of net 
revenues has decreased, the percentage of requisitions received with missing 
billing information has been reduced by approximately 30% and backlogs in 
rejected claims, unapplied cash and customer correspondence have been 
significantly reduced. These improvements were achieved in spite of a higher 
level of information requirements necessary for correct billing, especially 
those bills relating to Medicare. However, additional requirements to provide 
documentation of the "medical necessity" of testing have added to the backlog 
of unbilled receivables and caused third quarter 1996 bad debt expense as a 
percentage of revenues to increase above the rate Quest Diagnostics had 
experienced during the first two quarters of 1996. See "--Regulation and 
Reimbursement--Regulation of Reimbursement for Clinical Laboratory Services." 

Acquisitions and Dispositions 

   MetPath, Quest Diagnostics' predecessor, originally commenced operations 
in 1967 with laboratories only in the New York metropolitan area. Most of 
Quest Diagnostics' other regional laboratories have been added through 
acquisitions. Principally as the result of the acquisitions discussed below 
that were completed in 1993 and 1994, Quest Diagnostics' revenues have almost 
tripled since 1991. However, this increase in revenues is not reflected in 
the Quest Diagnostics Financial Statements because several of the major 
acquisitions are accounted for as a pooling of interests. Acquisition 
activity has diminished significantly since May 1995, in part so that Quest 
Diagnostics could concentrate on the integration of the laboratory networks 
that had been acquired in 1993 and 

                                      70 
<PAGE> 

1994. Quest Diagnostics may resume making acquisitions in the future, most
likely focusing on acquisitions of smaller laboratories that can be folded into
existing laboratories where Quest Diagnostics can expect to achieve significant
cost savings and other benefits resulting from the elimination of redundant
facilities and equipment and reductions in staffing or personnel. Quest
Diagnostics is evaluating its strategic alternatives relative to units whose
profitability does not meet its internal goals. These alternatives may include
joint ventures, alliances or dispositions. However, there are no negotiations or
definitive plans with respect to any such dispositions.

   During 1994 Corning acquired three large clinical laboratory testing 
companies, each of which was accounted for as a pooling of interests. In June 
1994, Corning acquired Maryland Medical Laboratory, Inc. ("MML"), a regional 
laboratory based in Baltimore, Maryland with approximately $90 million in 
annual revenues. In August 1994, Corning acquired the stock of Nichols 
Institute, a national esoteric clinical laboratory with approximately $280 
million in annual revenues. In October 1994, Corning acquired Bioran, a 
regional laboratory based in Cambridge, Massachusetts with approximately $65 
million in annual revenues. 

   In August 1993, Corning acquired Damon, a national clinical testing 
laboratory with approximately $330 million in annualized revenue. The 
acquisition was accounted for as a purchase. The assets of Damon's 
California- based laboratories were sold in April 1994 to Physicians Clinical 
Laboratory Inc. In November 1993, Quest Diagnostics acquired the clinical 
testing laboratories of Unilab in Dallas, Denver and Phoenix, in exchange for 
Quest Diagnostics' then 43% ownership of Unilab and the assumption of 
approximately $70 million of indebtedness of Unilab. In a separate 
transaction, Quest Diagnostics transferred to Unilab Quest Diagnostics' 
investment in J.S. Pathology PLC, a clinical testing laboratory based in the 
United Kingdom, in exchange for a small equity interest in Unilab. Quest 
Diagnostics currently owns approximately 4% of Unilab's outstanding common 
stock. In May 1993, Corning acquired and contributed to Quest Diagnostics 
DeYor Laboratory Inc., a regional laboratory based in Ohio, Pennsylvania and 
Tennessee with approximately $20 million of annual revenues. This transaction 
was accounted for under the pooling of interests method, although Quest 
Diagnostics' consolidated financial statements for prior periods have not 
been restated since this acquisition is not material. See Note 3 to the 
Audited Quest Diagnostics Financial Statements. In addition to the 
acquisitions discussed above, since January 1993 Quest Diagnostics has 
acquired approximately 25 other smaller clinical laboratories and customer 
lists, principally in assets acquisitions. Only one such acquisition has been 
completed since May 1995. 

Competition 

   The clinical laboratory testing business is intensely competitive. Quest 
Diagnostics believes that in 1995 the entire United States clinical 
laboratory testing industry had revenues exceeding $30 billion; approximately 
56% of such revenues were attributable to hospital-affiliated laboratories, 
approximately 36% were attributable to independent clinical laboratories and 
approximately 8% were attributable to physicians in their offices and 
laboratories. As recently as 1993, there were seven laboratories that 
provided clinical laboratory testing services on a national basis: Quest 
Diagnostics, SmithKline, National Health Laboratories Inc. ("NHL"), Roche 
Biomedical Laboratories Inc. ("Roche"), Damon, Allied Clinical Laboratories 
Inc. ("Allied") and Nichols Institute. In April 1995 Roche merged into NHL 
(under the name LabCorp), which had acquired Allied in June 1994. Quest 
Diagnostics acquired Nichols Institute in August 1994 and Damon in August 
1993. In addition, in the last several years a number of large regional 
laboratories have been acquired by national clinical laboratories. There are 
presently three national independent clinical laboratories: Quest 
Diagnostics, which had approximately $1.63 billion in revenues from clinical 
laboratory testing in 1995; LabCorp, which had approximately $1.68 billion in 
revenues from clinical laboratory testing in 1995 on a pro forma basis, after 
giving effct to the April 1995 merger of Roche into NHL; and SmithKline, 
which had approximately $1.29 billion in revenues from clinical laboratory 
testing in 1995. Both LabCorp and SmithKline are affiliated with large 
corporations that have greater financial resources than Quest Diagnostics. 
SmithKline is wholly owned by SmithKline Beecham Ltd. and R. Hoffman La Roche 
S.A. beneficially owns approximately 49.9% of the outstanding capital stock 
of LabCorp. 

   In addition to the three national clinical laboratories, Quest Diagnostics 
competes on a regional basis with many smaller regional independent clinical 
laboratories as well as laboratories owned by hospitals and physicians. Quest 
Diagnostics has the leading market share in most of the northeast, 
mid-Atlantic and midwest routine testing markets, while its market share is 
much lower in the routine testing market in the rest of the country. 
Approximately 65% of Quest Diagnostics' net revenues and almost all of its 
EBITDA currently is generated from markets in which Quest Diagnostics 
believes that it has the largest market share. In most of these markets Quest 
Diagnostics believes 

                                      71 
<PAGE> 

that it also is the lowest cost provider. Quest Diagnostics does not generally
compete in the California routine testing market other than in the San Diego
metropolitan area.


   Quest Diagnostics believes that the following factors, among others, are 
often used by health care providers in selecting a laboratory: (i) pricing of 
the laboratory's testing services; (ii) accuracy, timeliness and consistency 
in reporting test results; (iii) number and type of tests performed; (iv) 
service capability and convenience offered by the laboratory; and (v) its 
reputation in the medical community. Quest Diagnostics believes that it 
competes favorably with its principal competitors in each of these areas and 
is currently implementing strategies to improve its competitive position. See 
"--Business Strategy." 

   Quest Diagnostics believes that consolidation will continue in the 
clinical laboratory testing business. In addition, Quest Diagnostics believes 
that it and the other large independent clinical laboratory testing companies 
will be able to increase their share of the overall clinical laboratories 
testing market due to a number of external factors including cost 
efficiencies afforded by large-scale automated testing, Medicare 
reimbursement reductions and the growth of managed health care entities which 
require low-cost testing services and large service networks. In addition, 
legal restrictions on physician referrals and the ownership of laboratories 
as well as increased regulation of laboratories are expected to contribute to 
the continuing consolidation of the industry. 

Quality Assurance 

   Quest Diagnostics maintains a comprehensive quality assurance program for 
all of its laboratories and patient service centers. The goal is to ensure 
optimal patient care by continually improving the processes used for 
collection, storage and transportation of patient specimens, as well as the 
precision and accuracy of analysis and result reporting. 

   The Quest Diagnostics quality assurance efforts focus on: proficiency 
testing, process audits, statistical process control, credentialing and 
personnel training. 

   Internal Quality Control and Audits. Quality control samples are processed 
in parallel with the analysis of patient specimens. The results of tests on 
such samples are then monitored to identify drift, shift or imprecision in 
the analytical processes. In addition, Quest Diagnostics administers an 
extensive internal program of "blind" proficiency testing. These samples are 
processed through the Quest Diagnostics system as routine patient samples, 
unknown to the laboratory as quality control samples. Samples are then 
handled, processed and reported with patient specimens. This provides a 
system to assure accuracy of the entire pre- and post-analytical testing 
process. Another element of the Quest Diagnostics comprehensive quality 
assurance program includes performance of internal process audits. 

   External Proficiency Testing and Accreditation. All Quest Diagnostics 
laboratories participate in numerous externally conducted, blind sample 
quality surveillance programs. These include proficiency testing programs 
administered by the College of American Pathologists ("CAP"), as well as many 
state agencies. These programs supplement all other quality assurance 
procedures. 

   All Quest Diagnostics laboratories are accredited by CAP. Accreditation 
includes on-site inspections and participation in the CAP Proficiency Test 
Program. CAP is an independent nongovernmental organization of board 
certified pathologists that offers an accreditation program to which 
laboratories may voluntarily subscribe. CAP is approved by HCFA to inspect 
clinical laboratories to determine compliance with the standards required by 
the Clinical Laboratory Improvement Amendments of 1988 ("CLIA"). 

Regulation and Reimbursement 

   Overview. The clinical laboratory industry is subject to significant 
governmental regulation at the federal and state levels. All Quest 
Diagnostics laboratories and patient service centers are appropriately 
licensed and accredited by various state and federal agencies. 

   The health care industry is undergoing significant change as third-party 
payors, such as Medicare (which principally serves patients 65 and older), 
Medicaid (which principally serves indigent patients), private insurers and 
large employers increase their efforts to control the cost, utilization and 
delivery of health care services. In an effort to address the problem of 
increasing health care costs, legislation has been proposed or enacted at 
both the federal and state levels to regulate health care delivery in general 
and clinical laboratories in particular. Some of the proposals include 
managed competition, global budgeting and price controls. Although the 
Clinton Administration's health care reform proposal, initially advanced in 
1994, was not enacted, such proposal or other 

                                      72 
<PAGE> 

proposals may be considered in the future. In particular, Quest Diagnostics
believes that reductions in reimbursement for Medicare services will continue to
be implemented from time to time. Reductions in the reimbursement rates of other
third-party payors are likely to occur as well. Quest Diagnostics cannot predict
the effect health care reform, if enacted, would have on its business, and there
can be no assurance that such reforms, if enacted, would not have a material
adverse effect on Quest Diagnostics' business and operations.

   Regulation of Clinical Laboratory Operations. The CLIA standards were 
designed to ensure that all clinical laboratory testing services are 
uniformly accurate and of high quality by using a single set of requirements. 
On February 28, 1992, the final rules implementing CLIA were published in the 
Federal Register. These regulations extended federal oversight, with few 
exceptions, to virtually all clinical laboratories regardless of size, type, 
location or ownership of the laboratory. The regulations generally became 
effective in 1992. However, certain quality control and proficiency testing 
requirements are still being phased in. The standards for laboratory 
personnel, quality control, quality assurance and patient test management are 
based on complexity and risk factors. Laboratories categorized as "high" 
complexity are required to meet more stringent requirements than either 
"moderate" or "waived" (tests regarded as having a low potential for error 
and requiring little or no oversight) laboratories. 

   Most of the Quest Diagnostics laboratories are categorized as high 
complexity and these laboratories are in compliance with the more stringent 
standards for personnel, quality control, quality assurance and patient test 
management. A few Quest Diagnostics laboratories are categorized as moderate 
complexity (some STAT laboratories) or waived (only patient service centers). 

   The sanction for failure to comply with these regulations may be 
suspension, revocation or limitation of a laboratory's CLIA certificate 
necessary to conduct business, significant fines or criminal penalties. The 
loss of a license, imposition of a fine or future changes in such federal, 
state and local laws and regulations (or in the interpretation of current 
laws and regulations) could have a material adverse effect on Quest 
Diagnostics. 

   Quest Diagnostics is also subject to state regulation. CLIA permits states 
to adopt regulations that are more stringent than federal law. For example, 
state law may require that laboratory personnel meet certain more stringent 
qualifications, specify certain quality control standards, maintain certain 
records and undergo additional proficiency testing. For example, certain of 
Quest Diagnostics' laboratories are subject to the State of New York's 
clinical laboratory regulations, which contain provisions that are 
significantly more stringent than federal law. 

   Quest Diagnostics believes it is in material compliance with the foregoing 
standards. See "--Compliance Program." 

   Drug Testing. Drug testing for public sector employees is regulated by the 
Substance Abuse and Mental Health Services Administration ("SAMHSA") 
(formerly the National Institute on Drug Abuse), which has established 
detailed performance and quality standards that laboratories must meet in 
order to be approved to perform drug testing on employees of federal 
government contractors and certain other entities. To the extent that Quest 
Diagnostics' laboratories perform such testing, each must be certified by HHS 
as meeting SAMHSA standards. Seven of Quest Diagnostics' laboratories are 
SAMHSA certified. 

   Controlled Substances. The use of controlled substances in testing for 
drug abuse is regulated by the federal Drug Enforcement Administration 
("DEA"). All Quest Diagnostics laboratories using controlled substances for 
testing purposes are licensed by the DEA. 

   Medical Wastes and Radioactive Materials. Quest Diagnostics is subject to 
licensing and regulation under federal, state and local laws relating to the 
handling and disposal of medical specimens and hazardous waste and 
radioactive materials as well as to the safety and health of laboratory 
employees. All Quest Diagnostics laboratories are operated in material 
compliance with applicable federal and state laws and regulations relating to 
disposal of all laboratory specimens. Quest Diagnostics utilizes outside 
vendors for disposal of specimens. Although Quest Diagnostics believes that 
it is currently in compliance in all material respects with such federal, 
state and local laws, failure to comply could subject Quest Diagnostics to 
denial of the right to conduct business, fines, criminal penalties and other 
enforcement actions. 

   Occupational Safety. In addition to its comprehensive regulation of safety 
in the workplace, the federal Occupational Safety and Health Administration 
("OSHA") has established extensive requirements relating to workplace safety 
for health care employers, including clinical laboratories, whose workers may 
be exposed to blood- borne pathogens such as HIV and the hepatitis B virus. 
These regulations, among other things, require work practice controls, 
protective clothing and equipment, training, medical follow-up, vaccinations 
and other measures designed to minimize exposure to chemicals and 
transmission of blood-borne and airborne pathogens. 


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<PAGE> 

   Specimen Transportation. Regulations of the Department of Transportation, 
the Public Health Service and the Postal Service apply to the surface and air 
transportation of clinical laboratory specimens. 

   Regulation of Reimbursement for Clinical Laboratory Services. Containment 
of health care costs, including reimbursement for clinical laboratory 
services, has been a focus of ongoing governmental activity. In 1984, 
Congress established a Medicare fee schedule for clinical laboratory services 
performed for patients covered under Part B of the Medicare program. 
Subsequently, Congress imposed a national ceiling on the amount that would be 
paid under the Medicare fee schedule. Laboratories must bill the program 
directly and must accept the scheduled amount as payment in full for most 
tests performed on behalf of Medicare beneficiaries. In addition, state 
Medicaid programs are prohibited from paying more (and in most instances, pay 
significantly less) than the Medicare fee schedule for clinical laboratory 
testing services furnished to Medicaid recipients. In 1995, Quest Diagnostics 
derived approximately 20% and 3% of its net revenues from tests performed for 
beneficiaries of Medicare and Medicaid programs, respectively. Since 1984, 
Congress has periodically reduced the ceilings on Medicare reimbursement to 
clinical laboratories from previously authorized levels. In 1993, pursuant to 
the Omnibus Budget and Reconciliation Act of 1993 ("OBRA '93"), Congress 
reduced, effective January 1, 1994, the Medicare national fee schedule 
limitations from 88% of the 1984 national median to 76% of the 1984 national 
median, which reductions were phased in from 1994 through 1996 (to 84% in 
1994, 80% in 1995 and 76% in 1996, in each case as a percentage of the 1984 
national median). The 1996 reduction to 76% was implemented as scheduled on 
January 1, 1996. OBRA '93 also eliminated the provision for annual fee 
schedule increases based upon the consumer price index for 1994 and 1995. 
Medicare reimbursement reductions have a direct adverse effect on Quest 
Diagnostics' net earnings and cash flows. Quest Diagnostics cannot predict if 
additional Medicare reductions will be implemented. The Senate and House 
Medicare proposal (the Medicare Preservation Act of 1995) passed in October 
1995 would have reduced the national limitation to 65% beginning in 1997 and 
would have eliminated all annual consumer price index adjustments through 
2002. This reduction in laboratory reimbursement rates was retained in the 
House-Senate conference report agreed upon in November 1995. The President 
vetoed this bill in December 1995. 

   Effective January 1, 1996, HCFA adopted a new policy on reimbursement for 
chemistry panel tests. As of January 1, 1996, 22 automated tests (rather than 
19 tests) became reimbursable by Medicare as part of an automated chemistry 
profile. An additional allowance of $0.50 per test is authorized when more 
than 19 tests are billed in a panel. HCFA retains the authority to expand in 
the future the list of tests included in a panel. Effective as of March 1, 
1996, HCFA eliminated its prior policy of permitting payment for all tests 
contained in an automated chemistry panel when at least one of the tests in 
the panel is medically necessary. Under the new policy, Medicare payment will 
not exceed the amount that would be payable if only the tests that are 
"medically necessary" had been ordered. In addition, since 1995 most Medicare 
carriers have begun to require clinical laboratories to submit documentation 
supporting the medical necessity, as judged by ordering physicians, for many 
commonly ordered tests. Quest Diagnostics expects to incur additional 
reimbursement reductions and additional costs associated with the 
implementation of these requirements of HCFA and Medicare carriers. The 
amount of the reductions in reimbursements and additional costs cannot be 
determined at this time. See "--Billing." 

   Major clinical laboratories, including Quest Diagnostics, use dual fee 
schedules: "client" fees charged to physicians, hospitals, and institutions 
with which a laboratory deals on a bulk basis and "patient" fees charged to 
individual patients and third-party payors, including Medicare and Medicaid, 
who generally require separate bills or claims for each requisition. Medicare 
and other third party payors also set maximum fees that they will pay which 
are substantially lower than the patient fees otherwise charged by Quest 
Diagnostics, but are generally higher than Quest Diagnostics' client fees, 
which may be subject to negotiation or discount. Federal and some state 
regulatory programs prohibit clinical laboratories from charging government 
programs more than certain charges to other customers. During 1992, in 
issuing final regulations implementing the federal statutory prohibition 
against charging Medicare substantially in excess of a provider's usual 
charge, the OIG declined to provide any guidance concerning the 
interpretation of this legislation, including whether or not discounting or 
the dual fee structure employed by clinical laboratories might raise issues 
under the provision. 

   Medicare budget proposals developed by the Clinton Administration in 1993 
and 1994, along with proposals incorporated in many major health reform bills 
considered by Congress in 1994, called for the reinstatement of 20% Medicare 
clinical laboratory co-insurance (which was last in effect in 1984). While 
co-insurance was in effect, clinical laboratories received from Medicare 
carriers only 80% of their Medicare reimbursement rates and were required to 
bill Medicare beneficiaries for the balance of the charges. A co-insurance 
proposal was not included in any of the Congressional Medicare reform 
packages considered to date in the 1995 and 1996 legislative sessions. 


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<PAGE> 

However, it is still possible a co-insurance provision will be proposed in the
future and, if enacted, such a proposal could materially adversely affect the
revenues and costs of the clinical laboratory industry, including Quest
Diagnostics, by exposing the testing laboratory to the credit of individuals and
by increasing the number of bills. In addition, a laboratory could be subject to
potential fraud and abuse violations if adequate procedures to bill and collect
the co-insurance payments are not established and followed.

   Proposals have also been developed to procure Medicare and Medicaid 
laboratory testing services through competitive bidding mechanisms. To date, 
none of the Congressional Medicare reform packages introduced in the 1995 and 
1996 legislative sessions have included a competitive bidding provision for 
clinical laboratory tests. However, President Clinton's Medicare reform 
proposal would have established competitive bidding for clinical laboratory 
services. If competitive bidding were implemented, such action could 
materially adversely affect the revenues of the clinical laboratory industry, 
including Quest Diagnostics. HCFA is currently developing a demonstration 
project to determine whether competitive bidding can be used to provide 
quality laboratory services at prices below current Medicare reimbursement 
rates. The demonstration is expected to be conducted in Kentucky and to 
commence in 1997. 

   Future changes in federal, state and local regulations (or in the 
interpretation of current regulations) affecting governmental reimbursement 
for clinical laboratory testing could have a material adverse effect on Quest 
Diagnostics. Quest Diagnostics is unable to predict, however, whether and 
what type of legislation will be enacted into law. 

   Fraud and Abuse Regulations. The Medicare and Medicaid anti-kickback laws 
prohibit clinical laboratories from, among other things, making payments or 
furnishing other benefits to influence the referral of tests billed to 
Medicare, Medicaid or other federal programs. Penalties for violations of 
these federal laws include exclusion from participation in the 
Medicare/Medicaid programs, assets forfeitures, and civil and criminal 
penalties. Civil administrative penalties for a wide range of offenses may be 
up to $2,000 per item and twice the amount claimed. Under the Health 
Insurance Portability and Accountability Act of 1996 (the "Health Insurance 
Act"), the penalties will be increased, effective January 1, 1997 to up to 
$10,000 per item plus three times the amount claimed. In the case of certain 
offenses, exclusion from participation in Medicare and Medicaid is a 
mandatory penalty. 

   The fraud and abuse provisions are interpreted liberally and enforced 
aggressively by various enforcing agencies of the federal government, 
including the Federal Bureau of Investigation ("FBI") and the OIG. According 
to public statements by the DOJ, health care fraud has been elevated to the 
second-highest priority of the DOJ, and FBI agents have been transferred from 
investigating counterintelligence activities to health care provider fraud. 
The OIG also is involved in such investigations and has, according to recent 
workplans, targeted certain laboratory practices for study, investigation and 
prosecution. The federal government's involvement in curtailing fraud and 
abuse is likely to increase as a result of the enactment in August 1996 of 
the Health Insurance Act which will require, by January 1, 1997, the U.S. 
Attorney General and the OIG to jointly establish a program to (a) coordinate 
federal, state and local enforcement programs to control fraud and abuse with 
respect to health care, (b) conduct investigations, audits, evaluations and 
inspections relating to the delivery and payment for health care, (c) 
facilitate the enforcement of the health care fraud and abuse laws, (d) 
provide for the modification and establishment of safe harbors and to issue 
advisory opinions and Special Fraud Alerts and (e) provide for a data 
collection system for the reporting and disclosure of adverse actions taken 
against health care providers. The Health Insurance Act also authorizes the 
establishment of an anti-fraud and abuse trust fund funded through the 
collection of penalties and fines for violations of the health care 
anti-fraud laws as well as amounts authorized therefor by Congress. The 
Health Insurance Act also requires HHS to establish a program to encourage 
Medicare beneficiaries and others to report violations of the health care 
anti-fraud laws, including by paying to the reporting person a portion of any 
fines and penalties collected. 

   In October 1994, the OIG issued a Special Fraud Alert, which set forth a 
number of practices allegedly engaged in by clinical laboratories and health 
care providers that the OIG believes violate the anti-kickback laws. These 
practices include providing employees to collect patient samples at physician 
offices if the employees perform additional services for physicians that are 
typically the responsibility of the physicians' staff; selling laboratory 
services to renal dialysis centers at prices that are below fair market value 
in return for referrals of Medicare tests which are billed to Medicare at 
higher rates; providing free testing to a physician's HMO patients in 
situations where the referring physicians benefit from lower utilization; 
providing free pickup and disposal of bio-hazardous waste for physicians for 
items unrelated to a laboratory's testing services; providing facsimile 
machines or computers to physicians that are not exclusively used in 
connection with the laboratory services performed; and providing 

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<PAGE> 

free testing for health care providers, their families and their employees
(professional courtesy testing). The OIG stressed in the Special Fraud Alert
that when one purpose of the arrangements is to induce referral of program-
reimbursed laboratory testing, both the clinical laboratory and the health care
provider or physician may be liable under the anti-kickback laws and may be
subject to criminal prosecution and exclusion from participation in the Medicare
and Medicaid programs. The Special Fraud Alert was issued in part at the request
of the American Clinical Laboratory Association, which requested clarification
of certain of these rules. Quest Diagnostics does not believe that it has been
negatively affected by the issuance of the Special Fraud Alert.

   Many of these statutes and regulations, including those relating to joint 
ventures and alliances, are vague or indefinite and have not been interpreted 
by the courts. In addition, regulators have generally offered little guidance 
to the clinical laboratory industry. Despite requests from the American 
Clinical Laboratory Association for clarification of the anti-fraud and abuse 
rules, since 1992, OIG has issued only two fraud alerts specifically with 
regard to clinical laboratory practices and has insisted that it lacked 
statutory authority to issue advisory opinions. Legislation requiring OIG to 
issue fraud alerts and advisory opinions was enacted in August 1996, and as a 
result Quest Diagnostics is hopeful that additional regulatory guidance will 
be given to the clinical laboratory industry. 

   According to the 1995 work plan of the OIG, its recently established 
Office of Civil Fraud and Administrative Adjudication ("OCFAA") will be 
responsible for protecting the government-funded health care programs and 
deterring fraudulent conduct by health care providers through the negotiation 
and imposition of civil monetary penalties, assessments and program 
exclusions. The OCFAA works very closely with the DOJ, the Office of General 
Counsel of HHS and the OIG investigative and audit offices in combating fraud 
and abuse. In addition, the OIG stated in its 1995 work plan that it will 
determine the extent to which laboratories supply physicians' offices with 
phlebotomists (blood-drawing technicians), offer management services or 
medical waste pick-up to physicians, provide training to physicians or engage 
in other financial arrangements with purchasers of laboratories' services. 
The OIG will assess the potential benefits of such arrangements as well as 
the extent to which such arrangements might be unlawful. 

   A federal "self-referral" law commonly known as the "Stark" law has, since 
1992, generally prohibited (with certain exceptions) Medicare payments for 
laboratory tests referred by physicians who have (personally or through a 
family member) an investment interest in, or a compensation arrangement with, 
the testing laboratory. Since January 1995, these restrictions apply to 
Medicaid-covered services as well. Physicians may, however, be reimbursed by 
Medicare and Medicaid for testing performed by or under the supervision of 
the physician or the group practice to which the physician belongs. In 
addition, a physician may refer specimens to a laboratory owned by a company, 
such as Quest Diagnostics, whose stock is traded on a public exchange and 
which has stockholders' equity exceeding $75 million even if the physician 
owns stock of that company. An amendment to the Stark law in August 1993 
makes it clear that ordinary day-to-day transactions between laboratories and 
their customers, including, but not limited to, discounts granted by 
laboratories to their customers, are not covered by the compensation 
arrangement provisions of the Medicare statute. Sanctions for laboratory 
violations of the prohibition include denial of Medicare payments, refunds, 
civil money penalties of up to $15,000 for each service billed in violation 
of the prohibition and exclusion from the Medicare and Medicaid programs. 

   The 1995 House Medicare reform proposal contained, and the House-Senate 
report adopted, provisions that would significantly narrow the scope of the 
Stark anti-referral laws. That proposal would, among other changes, have 
ended the ban on physician referrals to laboratories based on any 
"compensation arrangements" between the laboratory and the physician. The 
President vetoed this bill on December 6, 1995. 

Government Investigations and Related Claims 

   
   Quest Diagnostics has settled various government and private claims (i.e.,
nongovernmental claims such as those by private insurers) totalling
approximately $195 million relating primarily to industry-wide billing and
marketing practices that had been substantially discontinued by early 1993.
Specifically, Quest Diagnostics has entered into, (i) for an aggregate of
approximately $180 million, five settlements with the OIG and the DOJ
(including, the MetPath and the Damon settlements discussed below) and two
settlements with state governments with respect to Medicare and Medicaid
marketing and billing practices of Quest Diagnostics and certain companies
acquired by Quest Diagnostics prior to their acquisition and (ii) twelve
completed settlements and one tentative settlement relating to private claims
totalling approximately $15 million. In addition, there are pending
investigations by the OIG and DOJ into billing and marketing practices at three
regional laboratories operated by Nichols prior to its acquisition by Quest
Diagnostics. There are no other private claims presently pending.
    
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<PAGE> 

Government Settlements 

    The MetPath Settlement. In September 1993, Quest Diagnostics (under the name
MetPath Inc.) entered into an agreement with the DOJ and the OIG pursuant to
which Quest Diagnostics paid a total of approximately $36 million in settlement
of civil claims by the United States that the company had wrongfully induced
physicians to order certain laboratory tests without their realizing that such
tests would be billed to Medicare at rates higher than those the physicians
believed were applicable.

   
   The Damon Settlement. By issuance of a civil subpoena in August 1993, the
government began a formal investigation of Damon, a company acquired by Corning
in August 1993. Subsequent to September 1993, several additional subpoenas were
issued. By a plea agreement and civil settlement agreement and release dated
October 9, 1996, between DOJ and Damon, all federal criminal matters within the
scope of the various federal investigations against Damon, and all claims
included in the civil qui tam cases underlying the civil investigations, were
settled for an aggregate of $119 million, which sum was reimbursed to Quest
Diagnostics by Corning. The settlement included base recoupments of
approximately $40 million (which did not differ materially from management's
estimate at June 30, 1996) and total criminal and civil payments in excess of
base recoupments of approximately $80 million. At the time Quest Diagnostics
began its settlement negotiations with DOJ in April 1996, it believed it had
meritorious defenses to a number of charges and claims made by the government.
Reserves established for such settlements in the second quarter of 1996 were
based on Quest Diagnostics' and its counsel's belief that the merits of its
factual and legal arguments would be given more weight by the government.
Certain of these positions were ultimately rejected by criminal and civil
prosecutors in the final rounds of negotiations which occurred in September
1996, resulting in a total settlement substantially in excess of what had
earlier been anticipated. The Damon settlement does not exclude Quest
Diagnostics from future participation in any federal health care programs on
account of Damon's practices. For further information regarding the Damon
settlement, see Note 13 to the Audited Quest Diagnostics Financial Statements
and Note 2 to the Quest Diagnostics Interim Financial Statements.
    

 Other Governmental Settlements. In addition to the MetPath settlement and 
the Damon settlement, since 1992 Quest Diagnostics has settled five other 
federal and state billing-related claims for a total of approximately $25 
million. 

Ongoing Government Investigations 

 The Nichols Investigation. By issuance of a civil subpoena in August 1993, 
the government began a formal investigation of Nichols, a company acquired by 
Corning in August 1994. The investigation of Nichols remains open. While 
Quest Diagnostics has established reserves in respect of the Nichols 
investigations, at present there are no settlement discussions pending 
between DOJ and Quest Diagnostics regarding Nichols, and it is too early to 
predict the outcome of this investigation. Remedies available to the 
government include exclusion from participation in the Medicare and Medicaid 
programs, criminal fines, civil recoveries plus civil penalties and asset 
forfeitures. Although application of such remedies and penalties could 
materially and adversely affect Quest Diagnostics' business, financial 
condition, results of operations and prospects, management believes that the 
possibility of this happening is remote. Quest Diagnostics derived 
approximately 23% and 22% of its net revenues for the year ended December 31, 
1995 and the nine months ended September 30, 1996, respectively, from 
Medicare and Medicaid programs. However, in light of the Corporate Integrity 
Agreement referred to below entered into between Quest Diagnostics and the 
OIG in connection with the Damon settlement, the fact that the matters being 
investigated were corrected with or before Quest Diagnostics' acquisition of 
Nichols and Quest Diagnostics' cooperation in this investigation, Quest 
Diagnostics believes the prospect of such exclusion on account of the 
investigation is remote. As discussed below, Corning has agreed to indemnify 
Quest Diagnostics against any monetary penalties, fines or settlements for 
any governmental claims that may arise as a result of the Nichols 
investigations. 

 The Damon Officer Investigations. Quest Diagnostics understands that the 
Boston United States Attorney's Office has designated several former officers 
and employees of Damon as targets of its criminal investigation, and will 
seek indictments against them. Under the agreement and plan of merger under 
which Damon was acquired by Corning, Quest Diagnostics is obligated to 
indemnify former officers and directors of Damon to the fullest extent 
permitted by Delaware law with respect to this investigation. These 
obligations will remain those of Quest Diagnostics and will not be 
indemnified by Corning. In addition, as part of the Damon settlement, Corning 
agreed to cooperate with DOJ in its continuing investigation of individuals 
formerly associated with Damon and, in connection therewith, Quest 
Diagnostics is providing additional information pursuant to several 
subpoenas. 

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<PAGE> 

   Other Government Investigations. In December 1995, Quest Diagnostics 
received a subpoena from the OIG seeking information as to Quest Diagnostics' 
policies in instances in which specimens were received and tested by a 
laboratory without first receiving or verifying specific test requisitions. 
While compliance with the subpoena is ongoing, Quest Diagnostics has 
concluded the occurrence of this practice was relatively rare and was engaged 
in primarily to preserve the integrity of test results from specimens subject 
to rapid deterioration. During 1996, Quest Diagnostics voluntarily 
self-reported to the government a few isolated events, involving billings of 
approximately $16 million, that may have resulted in overpayment by Medicare 
and Medicaid to Quest Diagnostics. It is Quest Diagnostics' policy to 
internally investigate all such incidents and to self-report and reimburse 
payors as appropriate. Although Quest Diagnostics has commenced internal 
investigations to quantify the amounts that may be recouped by the government 
and corrective action has been taken as to each such event, it is too early 
to predict the outcome of these disclosures to the government. As discussed 
below, Corning has agreed to indemnify Quest Diagnostics against any monetary 
penalties, fines or settlements for any governmental claims that may arise as 
a result of the investigations described in this paragraph. 

Outlook for Future Government Investigations 

    The Damon settlement involved, and a settlement regarding Nichols is
expected to involve, only matters predating Corning's acquisition of both such
companies, and turned on, or will turn on, facts unique to those companies and
other factors individual government enforcement personnel may take into account.
However, recent experience in Quest Diagnostics' settlement of the Damon case
and public announcements by various government officials indicate that the
government's position on health care fraud is still hardening and collections of
amounts greatly in excess of mere recoupment of overcharges from laboratories
and other providers will be more prevalent. In addition, the newly adopted
Health Insurance Act includes provisions to combat health care fraud and abuse
will give federal enforcement personnel substantially increased funding, powers
and remedies to pursue suspected fraud and abuse. In connection with the Damon
settlement, Quest Diagnostics signed a Corporate Integrity Agreement pursuant to
which Quest Diagnostics will maintain its corporate compliance program, modify
certain of its marketing materials, make periodic reports to the OIG and take
certain other steps to demonstrate Quest Diagnostics' integrity as a provider of
services to federally sponsored health care programs. This agreement also
includes an obligation to self-report instances of noncompliance that are
uncovered by Quest Diagnostics, but also gives Quest Diagnostics the opportunity
to obtain clearer guidance on matters of compliance and to resolve compliance
issues directly with OIG. Importantly, the agreement gives Quest Diagnostics the
opportunity to cure any asserted breaches and to otherwise initiate corrective
actions, which Quest Diagnostics believes should help to avoid enforcement
actions outside of the process provided in the agreement. See "--Compliance
Program."


Private Settlements and Claims 

   Since 1992 Quest Diagnostics has settled thirteen private actions relating 
to the governmental settlements described above for an aggregate of 
approximately $15 million. There are no private claims presently pending. 

Corning Indemnity 


   In connection with the Distributions, Corning will agree to indemnify Quest
Diagnostics against all monetary penalties, fines or settlements for any
governmental claims arising out of alleged violations of applicable federal
fraud and health care statutes and relating to billing practices of Quest
Diagnostics and its predecessors that have been settled or are pending on the
Distribution Date. This includes the settlements described under "--Government
Settlements" above and the claims described under "--Ongoing Government
Investigations--The Nichols Investigation" and "--Other Government
Investigations." Corning will also agree to indemnify Quest Diagnostics for 50%
of the aggregate of all judgment or settlement payments made by Quest
Diagnostics that are in excess of $42.0 million in respect of claims by private
parties (i.e., nongovernmental parties such as private insurers) that relate to
indemnified or previously settled governmental claims (such as the Damon
settlement) and that allege overbillings by Quest Diagnostics or any existing
subsidiaries of Quest Diagnostics, for services provided prior to the
Distribution Date; provided, however, such indemnification will not exceed $25.0
million in the aggregate and that all amounts indemnified against by Corning for
the benefit of Quest Diagnostics will be calculated on a net after-tax basis by
taking into account any deductions and other tax benefits realized by Quest
Diagnostics (or a consolidated group of which Quest Diagnostics is a member
after the Distributions (the "Quest Diagnostics Group")) in respect of the
underlying settlement, judgment payment, or other loss (or portion thereof)
indemnified



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against by Corning generally at the time and to the extent such deductions or 
tax benefits are deemed to reduce the tax liability of Quest Diagnostics or 
the Quest Diagnostics Group. 

   Corning will not indemnify Quest Diagnostics against (i) any governmental 
claims that arise after the Distribution Date pursuant to service of subpoena 
or other notice of such investigation after the Distribution Date, (ii) any 
nongovernmental claims unrelated to the indemnified governmental claims or 
investigations, (iii) any nongovernmental claims not settled prior to five 
years after the Distribution Date, (iv) any consequential or incidental 
damages relating to the billing claims, including losses of revenues and 
profits as a consequence of exclusion for participation in federal or state 
health care programs or (v) the fees and expenses of litigation. Quest 
Diagnostics will control the defense of any governmental claim or 
investigation unless Corning elects to assume such defense. However, in the 
case of all nongovernmental claims related to indemnified governmental claims 
related to alleged overbillings, Quest Diagnostics will control the defense. 
All disputes under the Transaction Agreement are subject to binding 
arbitration. See "The Relationship Among Corning, Quest Diagnostics and 
Covance After the Distributions--Transaction Agreement." 

Quest Diagnostics' Reserves 


   Quest Diagnostics' aggregate reserve with respect to all governmental and 
private claims, including litigation costs of approximately $6.6 million, was 
$215 million at September 30, 1996 and is estimated to be $85 million at the 
Distribution Date. The approximately $130 million reduction in the reserve is 
due to the subsequent payment of the Damon settlement ($119 million), the 
settlement of an investigation into billing of certain hematology indices 
(reserved at $7 million) and the settlement of a private claim (reserved at 
$6 million). These settlements have been or will be funded by contributions 
to Quest Diagnostics' capital by Corning. The $85 million reserve represents 
amounts for future government and private settlements of matters which are 
either presently pending or anticipated as a consequence of the government 
and private settlements and self-reported matters described above. Based on 
information available to management and Quest Diagnostics' experience with 
past settlements, especially the Damon settlement and the fact that the 
aggregate amount of such settlement was significantly in excess of 
established reserves, management has reassessed its reserve levels and 
believes that its current level of reserves is adequate. However, it is 
possible that the additional information may become available (such as the 
indication by the government of criminal activity, additional tests being 
questioned or other changes in the government's theories of wrongdoing) which 
may cause the final resolution of these matters to be in excess of 
established reserves by an amount which could be material to Quest 
Diagnostics' results of operations and, for non-indemnified claims, Quest 
Diagnostics' cash flows in the period in which such claims are settled. While 
none of the governmental or nongovernmental investigations or claims is 
covered by insurance, Quest Diagnostics does not believe that these matters 
will have a material adverse effect on Quest Diagnostics' overall financial 
condition. 


Compliance Program 

   Because of evolving interpretations of regulations and the national debate 
over health care, compliance with all Medicare, Medicaid and other 
government-established rules and regulations has become a significant concern 
throughout the clinical laboratory industry. Quest Diagnostics began the 
implementation of a compliance program early in 1993. The objective of the 
program is to develop aggressive and reliable compliance safeguards. Emphasis 
is placed on developing training programs for personnel intended to assure 
the strict implementation and observance of all applicable rules and 
regulations. Further, in-depth reviews of procedures, personnel and 
facilities are conducted to assure regulatory compliance throughout Quest 
Diagnostics. Quest Diagnostics' current compliance plan establishes a 
Compliance Committee of the Quest Diagnostics Board and requires periodic 
reporting of compliance operations by management to the Compliance Committee. 
Such sharpened focus on regulatory standards and procedures will continue to 
be a priority for Quest Diagnostics in the future. 

    Quest Diagnostics has established a comprehensive program designed to ensure
that it is in compliance in all material respects with all statutes, regulations
and other requirements applicable to its clinical laboratory operations. This
program was publicly cited with approval by government officials at the time the
Damon settlement was announced and characterized as a "model" for the industry.
In addition, the government advised Quest Diagnostics representatives that Quest
Diagnostics' compliance program, coupled with corrective action taken by Quest
Diagnostics after its acquisition of Damon, greatly reduced the amounts of fines
and penalties, and was influential in causing the OIG not to seek exclusion of
Quest Diagnostics from future participation in governmental health care
programs. Pursuant to the Damon settlement, Quest Diagnostics signed a five year
Corporate Integrity Agreement with the OIG pursuant to which Quest Diagnostics
will, among other things, maintain its corporate

                                      79 
<PAGE> 

compliance program, make certain changes to its test order forms, provide
certain additional notices to ordering physicians, provide to the OIG data on
certain test ordering patterns, adopt certain pricing guidelines, audit
laboratory operations, deliver annual reports on compliance activities, and
investigate and report instances of noncompliance, including any corrective
actions and disciplinary steps. Importantly, the agreement gives Quest
Diagnostics the opportunity to cure any asserted breaches and to otherwise
initiate corrective actions, which Quest Diagnostics believes should help to
avoid enforcement actions outside of the process provided in the agreement. The
agreement gives Quest Diagnostics the opportunity to obtain clearer guidance on
matters of compliance and to resolve compliance issues directly with the OIG.
Quest Diagnostics has been advised that its principal competitors will be
obliged to execute similar agreements at the conclusion of investigations
pending against them and that the OIG will likely publish to the clinical
laboratory testing industry a guideline on the essential elements of a
satisfactory compliance program. This latter step may help create a fairer
competitive environment for Quest Diagnostics. None of the undertakings included
in the agreement is expected to have any material adverse affect on Quest
Diagnostics' business, financial condition, results of operations and prospects.
The clinical laboratory testing industry is, however, subject to extensive
regulation. Quest Diagnostics believes that it is in all material respects in
compliance with all applicable statutes and regulations. However, there can be
no assurance that any statutes or regulations might not be interpreted or
applied by a prosecutorial, regulatory or judicial authority in a manner that
would adversely affect Quest Diagnostics. Potential sanctions for violation of
these statutes and regulations include significant fines and the loss of various
licenses, certificates and authorizations.

Insurance 

   Quest Diagnostics maintains liability insurance (subject to maximum limits 
and self-insured retentions) for claims, which may be substantial, that could 
result from providing or failing to provide clinical laboratory testing 
services, including inaccurate testing results. While there can be no 
assurance that coverage will be adequate to cover all future exposure, 
management believes that the present levels of coverage are adequate to cover 
currently estimated exposures. Although Quest Diagnostics believes that it 
will be able to obtain adequate insurance coverage in the future at 
acceptable costs, there can be no assurance that Quest Diagnostics will be 
able to obtain such coverage or will be able to do so at an acceptable cost 
or that Quest Diagnostics will not incur significant liabilities in excess of 
policy limits. 

Employees 

   At September 30, 1996, Quest Diagnostics employed approximately 18,700 
people. These include approximately 16,500 full-time employees and 
approximately 2,200 part-time employees. Quest Diagnostics has no collective 
bargaining agreements with any unions and believes that its overall relations 
with its employees are good. 

Seasonality 

   During the summer months, year-end holiday periods and other major 
holidays, volume of testing declines, reducing net revenues and resulting 
cash flows below annual averages during the third and fourth quarters each 
year. Winter months are also subject to declines in testing volume due to 
inclement weather. As a result, comparisons of the results of successive 
quarters may not accurately reflect trends or results for the full year. See 
"Management's Discussion and Analysis of Financial Condition and Results of 
Operations of Quest Diagnostics--Overview." 

Properties 

   Quest Diagnostics's principal laboratories (listed alphabetically by 
state) are located in the following metropolitan areas: 

<TABLE>
<CAPTION>
Location                                            Type of Laboratory       Leased or Owned 
- -----------------------------------------------     ------------------       --------------- 
<S>                                                        <C>                     <C>
Phoenix, Arizona                                           Regional                Leased 
San Diego, California                                      Regional                Leased 
San Juan Capistrano, California                            Esoteric                Owned 
Denver, Colorado                                           Regional                Leased 
New Haven, Connecticut                                     Regional                Owned 
Miami, Florida                                              Branch                 Leased 
Tampa, Florida                                             Regional                Leased 
Atlanta, Georgia                                           Regional                Leased 
Chicago, Illinois                                          Regional                Leased 

                                      80
<PAGE> 

Location                                            Type of Laboratory       Leased or Owned 
- -----------------------------------------------     ------------------       --------------- 
Indianapolis, Indiana                                       Branch                 Leased 
Baltimore, Maryland                                        Regional                Owned 
Boston, Massachusetts                                                         Owned subject to 
                                                           Regional               put/call 
                                                                               with option to 
                                                                                   lease 
Detroit, Michigan                                          Regional                Leased 
Grand Rapids, Michigan                                      Branch                 Leased 
Kansas City, Missouri                                       Branch                 Leased 
St. Louis, Missouri                                        Regional                Leased 
Billings, Montana                                           Branch                 Leased 
Lincoln, Nebraska                                          Regional          Managed (hospital) 
Teterboro, New Jersey/New York, New York                   Regional                Owned 
Albuquerque, New Mexico                                     Branch                 Leased 
Buffalo, New York                                           Branch                 Owned 
Long Island, New York                                       Branch                 Leased 
Cleveland, Ohio                                             Branch                 Owned 
Columbus, Ohio                                              Branch                 Leased 
Portland, Oregon                                           Regional                Leased 
Erie, Pennsylvania                                                            Leased by joint 
                                                            Branch                venture 
Philadelphia, Pennsylvania                                 Regional                Leased 
Pittsburgh, Pennsylvania                                   Regional                Leased 
Nashville, Tennessee                                        Branch                 Owned 
Dallas, Texas                                              Regional                Leased 
El Paso, Texas                                              Branch                 Leased 
Salt Lake City, Utah                                        Branch                 Leased 
</TABLE>

   Quest Diagnostics executive offices are located in Teterboro, New Jersey 
in the building that serves as Quest Diagnostics' regional laboratory in the 
New York City metropolitan area. Quest Diagnostics owns its branch laboratory 
facility in Mexico City. Quest Diagnostics believes that, in general, its 
laboratory facilities are suitable and adequate for its current and 
anticipated future levels of operation. Quest Diagnostics believes that if it 
were unable to renew the lease on any of its testing facilities, it could 
find alternative space at competitive market rates and relocate its 
operations to such new locations. 

Legal Proceedings 

   In addition to the investigations described in "--Government 
Investigations and Related Claims," Quest Diagnostics is involved in various 
legal proceedings arising in the ordinary course of business. Some of the 
proceedings against Quest Diagnostics involve claims that are substantial in 
amount. Although it is not feasible to predict the outcome of such 
proceedings or any claims made against Quest Diagnostics, it does not 
anticipate that the ultimate liability of such proceedings or claims will 
have a material adverse effect on Quest Diagnostics' financial position or 
results of operations as they primarily relate to professional liability for 
which Quest Diagnostics believes it has adequate insurance coverage. Quest 
Diagnostics maintains professional liability insurance for its professional 
liability claims. See "--Insurance." 

IMPORTANT FACTORS REGARDING FORWARD LOOKING STATEMENTS 

   Quest Diagnostics wishes to caution stockholders that the following 
factors are hereby identified as important factors that could cause Quest 
Diagnostics' actual financial results to differ materially from those 
projected, forecast, estimated, or budgeted by Quest Diagnostics in 
forward-looking statements. 

   (a) Heightened competition, including the intensification of price 
       competition. See "Risk Factors--Risks Relating to Quest 
       Diagnostics--Intense Competition." 

                                      81 
<PAGE> 

   (b) Impact of changes in payor mix, including the shift from traditional, 
       fee-for-service medicine to managed- cost health care. See "Risk 
       Factors--Risks Relating to Quest Diagnostics--Role of Managed Care." 

   (c) Adverse actions by governmental or other third-party payors, including 
       unilateral reduction of fee schedules payable to Quest Diagnostics. 


   (d) The impact upon Quest Diagnostics' collection rates or general or 
       administrative expenses resulting from compliance with Medicare 
       administrative policies, including specifically the recent 
       requirements of Medicare carriers to provide diagnosis codes for 
       commonly ordered tests and the policy of HCFA to limit Medicare 
       reimbursement for tests contained in automated chemistry panels to the 
       amount that would have been paid if only the covered tests, determined 
       on the basis of demonstrable "medical necessity," had been ordered. 
       See "Risk Factors--Risks Relating to Quest Diagnostics--Reliance on 
       Medicare/Medicaid Reimbursements" and "Risk Factors--Risks Relating to 
       Quest Diagnostics--Government Regulation." 


   (e) Adverse results from pending governmental investigations, including in 
       particular significant monetary damages and/or exclusion from the 
       Medicare and Medicaid programs and/or other significant litigation 
       matters. Also, the absence of indemnification from Corning for private 
       claims unrelated to the indemnified governmental claims or 
       investigations and for private claims that are not settled within five 
       years of the Distribution Date. See "Risk Factors--Risks Relating to 
       Quest Diagnostics--Government Investigations and Related Claims." 

   (f) Failure to obtain new customers, retain existing customers or 
       reduction in tests ordered or specimens submitted by existing 
       customers. 

   (g) Inability to obtain professional liability insurance coverage or a 
       material increase in premiums for such coverage. 

   (h) Denial of CLIA certification or other licensure of any of Quest 
       Diagnostics's clinical laboratories under CLIA, by HCFA for Medicare 
       and Medicaid programs or other federal, state and local agencies. See 
       "Risk Factors--Risks Relating to Quest Diagnostics--Government 
       Regulation." 

   (i) Adverse publicity and news coverage about Quest Diagnostics or the 
       clinical laboratory industry. 

   (j) Computer or other system failures that affect the ability of Quest 
       Diagnostics to perform tests, report test results or properly bill 
       customers. See "Risk Factors--Risks Relating to Quest 
       Diagnostics--Billing." 

   (k) Development of technologies that substantially alter the practice of 
       laboratory medicine. 

                                      82 
<PAGE> 

                       MANAGEMENT OF QUEST DIAGNOSTICS 

Management 


   Directors. Certain information with respect to the persons who will serve 
as directors of Quest Diagnostics following the Distributions is set forth 
below. Prior to the closing of the Quest Diagnostics Notes Offering and the 
Quest Diagnostics Spin-Off Distribution, one of the current directors will 
resign and the prospective directors listed below will be elected. As 
provided in the Quest Diagnostics Certificate, the Quest Diagnostics Board 
will be divided into three classes effective upon the Distributions and one 
class of the Quest Diagnostics Board will be elected for a three-year term at 
each annual meeting of stockholders. Included in the information set forth 
below are the names of the directors of each class. The term for which each 
director will initially be elected has not yet been determined. Quest 
Diagnostics is contemplating the selection of additional independent 
directors, which selection may occur prior to the Distributions. Quest 
Diagnostics does not intend to hold an annual meeting of stockholders until 
the Spring of 1998. 



<TABLE>
<CAPTION>
Name                          Age 
- ------------------            --- 
<S>                           <C>
Kenneth W. Freeman             46 
Van C. Campbell                58 
David A. Duke                  61 
Gail R. Wilensky               53 
</TABLE>

   Kenneth W. Freeman was elected President and Chief Executive Officer of 
Quest Diagnostics in May 1995 and has been a director of Quest Diagnostics 
since July 1995. Prior to 1995, he served in a variety of key financial and 
managerial positions at Corning, which he joined in 1972. He was elected 
controller and a vice president of Corning in 1985, senior vice president in 
1987, and general manager of the Science Products Division in 1989. He was 
appointed president and chief operating officer of Corning Asahi Video 
Products Company in 1990. In 1993, he was elected executive vice president. 

   Van C. Campbell is the Vice Chairman of Corning, which he joined in 1964. 
He was elected assistant treasurer in 1971, treasurer in 1972, a vice 
president in 1973, financial vice president in 1975 and senior vice president 
for finance in 1980. He became general manager of the Consumer Products 
Division in 1981. Mr. Campbell was elected vice chairman and a director in 
1983 and during 1995 was appointed to the additional position of chairman of 
Corning Life Sciences, Inc. He is a director of Armstrong World Industries, 
Inc. and General Signal Corporation. Mr. Campbell has been a director of 
Quest Diagnostics since January 1991. 


   David A. Duke is a Retired Vice Chairman of Corning. Dr. Duke joined 
Corning in 1962 and served in a succession of research and management 
positions. He was elected vice president--Telecommunications Products in 
1980, elected a senior vice president in 1984 and named director of Research 
and Development in 1985. He became responsible for Engineering in March 1987 
and was elected as a director and Vice Chairman of Corning in 1988. He 
resigned as a director of Corning in April 1996 and retired in June 1996. Dr. 
Duke is a director of Armco, Inc. Dr. Duke was a director of Quest 
Diagnostics from October 1994 to July 1996 and was re-elected a director of 
Quest Diagnostics in October 1996. 



   Gail R. Wilensky is the John M. Olin Senior Fellow at Project HOPE, an 
international non-profit health foundation, which she joined in 1993. She is 
currently the chair of the Physician Payment Review Commission which advises 
Congress on physician payment and other Medicare issues. In 1992 and 1993, 
Dr. Wilensky served as a deputy assistant to the President for policy 
development relating to health and welfare issues. From 1990 to 1992, she was 
the administrator of the Health Care Financing Administration where she 
directed the Medicare and Medicaid programs. Dr. Wilensky is a director of 
Advance Tissue Sciences Inc., Capstone Pharmacy Inc., Coram Healthcare Corp., 
Neopath Inc., St. Jude Medical Corp., SMS Corporation, Syncor Corporation and 
United Healthcare Corporation. 



   Directors' Compensation. Each director of Quest Diagnostics, other than a 
director who is an employee of Quest Diagnostics, will receive $18,000 
annually for service as a director and will also be paid $1,000 for each 
meeting of the Quest Diagnostics Board and $500 for each meeting of any 
committee thereof which he or she attends. In addition, directors serving as 
committee chairs would receive an additional annual retainer of $1500. 


   Quest Diagnostics has adopted, effective the Distribution Date, a deferred 
compensation plan for directors pursuant to which each director may elect to 
defer until a date specified by him receipt of all or a portion of his 

                                      83 
<PAGE> 


compensation. Such plan provides that amounts deferred may be allocated to 
(i) a cash account upon which amounts deferred may earn interest, compounded 
quarterly, at the base rate of Citibank, N.A. in effect on certain specified 
dates, (ii) a market value account, the value of which will be based upon the 
market value of Quest Diagnostics Common Stock from time to time, or (iii) a 
combination of such accounts. All non-employee directors will be eligible to 
participate in the plan. 


   Quest Diagnostics has adopted, effective the Distribution Date, a 
restricted stock plan for non-employee directors, pursuant to which Quest 
Diagnostics will issue to each non-employee director elected 750 shares of 
Quest Diagnostics Common Stock for each year specified in the term of service 
for which such director was elected, subject to forfeiture and restrictions 
on transfer, and 5,000 shares upon such director's election, subject to 
forfeiture and restrictions on transfer. 

   Committees of the Board of Directors. Prior to the Distributions, the 
Quest Diagnostics Board is expected to establish and designate specific 
functions and areas of oversight to an Audit and Finance Committee, a 
Compensation Committee ("Quest Diagnostics Compensation Committee") and a 
Compliance Committee. The Audit and Finance Committee will examine and 
consider matters relating to the financial affairs of Quest Diagnostics, 
including reviewing Quest Diagnostics' annual financial statements, the scope 
of the independent and internal audits and the independent auditor's letter 
to management concerning the effectiveness of Quest Diagnostics's internal 
financial and accounting controls. The Quest Diagnostics Compensation 
Committee will make recommendations to the Quest Diagnostics Board with 
respect to programs for human resource development and management 
organization and succession, determine senior executive compensation, make 
recommendations to the Quest Diagnostics Board with respect to compensation 
matters and policies and employee benefit and incentive plans, administer 
such plans, and administer Quest Diagnostics' stock option and equity based 
plans and grant stock options and other rights under such plans. The 
Compliance Committee will oversee Quest Diagnostics' compliance program, 
which is administered by management's compliance council. The council will 
prepare for review and action by the Compliance Committee reports on such 
matters as audits and investigations. See "Business of Quest 
Diagnostics--Compliance Program." 

   Executive Officers of Quest Diagnostics. In addition to Mr. Freeman, the 
following persons will serve as executive officers of Quest Diagnostics after 
the Distributions: 

   Robert A. Carothers (60) will become Vice President and Chief Financial 
Officer at the Distribution Date. Mr. Carothers joined Corning in 1959 and 
has served in a number of key financial positions in the United States and 
Japan. He was elected Assistant Controller in 1991. In January 1996 he was 
appointed Assistant to the President of Quest Diagnostics. 


   James D. Chambers (40) is Vice President-Billing. Mr. Chambers joined 
Corning in 1986 and has served in a variety of managerial and financial 
positions for Corning and its subsidiaries, becoming Assistant Treasurer in 
1991. Mr. Chambers joined Quest Diagnostics in 1992 as Treasurer and served 
as Chief Financial Officer from 1994 through 1995. In 1995 Mr. Chambers 
assumed his current responsibilities overseeing Quest Diagnostics' billing 
process. At the Distribution Date, Mr. Chambers will also assume 
responsibility for investor relations. 



   Gregory C. Critchfield, M.D. (45) is Senior Vice President, and Chief 
Medical and Science Officer. Dr. Critchfield joined Quest Diagnostics in 1995 
as Chief Laboratory Officer and assumed his current responsibilities in May 
1996. Dr. Critchfield has served as a consultant to the National Institutes 
of Health in the capacity of a reviewer for more than ten years and was 
selected as Study Section Chair of several Multidisciplinary Review Teams 
during the last two years. Prior to joining Quest Diagnostics, Dr. 
Critchfield was a clinical pathologist with Intermountain Health Care ("IHC") 
for eight years and served in various director positions with IHC Laboratory 
Services, including Director of Clinical Pathology. Dr. Critchfield also 
served as Chairman of the Department of Pathology at Utah Valley Regional 
Medical Center from 1994 through 1995. 


   Kurt R. Fischer (41) is Vice President-Human Resources. Mr. Fischer joined 
Corning in 1976 and has served in a variety of Human Resources positions. He 
was appointed Human Resource Manager for the Research, Development and 
Engineering Group in 1986 and Director-Quality and Performance Management for 
the Specialty Materials Group in 1991. Mr. Fischer assumed his present 
responsibilities with Quest Diagnostics in December 1995. 

   Delbert A. Fisher, M.D. (68) is Vice President of Corning Nichols 
Institute and currently serves as President of its Academic Associates, a 
select group of eminent physicians and scientists who advise the company on 
new 

                                      84 
<PAGE> 


medical and scientific developments. Dr. Fisher joined Nichols Institute in 
1991 as President of its esoteric laboratory facility and assumed his present 
responsibilities in 1993. Prior to joining Nichols, he was a professor of 
pediatrics and the Associate Chairman of the Department of Pediatrics of the 
UCLA School of Medicine for 23 years. 



   Raymond Gambino, M.D. (70) is Chief Medical Officer Emeritus. Dr. Gambino 
joined Quest Diagnostics in 1983 as President of the Eastern Region. From 
1984 to 1994, Dr. Gambino served as Chief Medical Officer and Executive Vice 
President, at which time his appointment was changed to emeritus. He 
continues to serve Quest Diagnostics as a senior medical advisor. 


   Don M. Hardison, Jr. (45) is Senior Vice President-Sales and Marketing, 
with overall responsibility for all commercial activities. Mr. Hardison 
joined Quest Diagnostics in January 1996. Prior to joining Quest Diagnostics, 
Mr. Hardison had 18 years experience in health care with subsidiaries of 
SmithKline Beecham and its predecessor entities, including seven years with 
the clinical laboratory division of SmithKline, where he held a succession of 
positions including Director of Marketing; Vice President of Sales-Northern; 
Vice President-General Manager of the Atlanta Operation; and Vice President 
of Sales and Marketing. 

   Paul A. Krieger, M.D. (50) is Vice President-Anatomic Pathology. Dr. 
Krieger joined Quest Diagnostics in 1975 and served as Vice President, 
Director of Anatomic Pathology at Quest Diagnostics' regional laboratory in 
Teterboro, New Jersey until 1995, when he was appointed to his present 
position. Concurrent with his employment with Quest Diagnostics, Dr. Krieger 
has served as an Adjunct Assistant Professor at the College of Physicians and 
Surgeons of Columbia University. 

   Raymond C. Marier (51) is Vice President, Secretary and General Counsel. 
Mr. Marier joined Corning's Legal Department in 1973 as an Assistant Counsel, 
where he worked with a number of Corning's operating units, including its 
Medical and Science Products Divisions. He has held his present position 
since 1992. 

   C. Kim McCarthy (41) is Vice President-Compliance and Government Affairs. 
Ms. McCarthy joined Corning in 1987 as Director of Federal Government Affairs 
and Legislative Counsel. She became Vice President of Public Affairs of Quest 
Diagnostics in 1992 and Senior Vice President of Corporate Affairs in 1994. 
Ms. McCarthy assumed her present responsibilities in June 1996. 

   Alister W. Reynolds (39) is Vice President-Information Technology. Mr. 
Reynolds joined Quest Diagnostics in 1982 and has served in a variety of 
staff, executive and general management positions. Mr. Reynolds assumed his 
current responsibilities in 1995. 


   Douglas M. VanOort (40) will become Senior Vice President-Operations at 
the Distribution Date. Mr. VanOort joined Corning in 1982 and has served in 
various finance, analysis and control positions. He became Vice President and 
Chief Financial Officer of Corning's Life Sciences division in 1990, Senior 
Vice President-Finance and New Business Development of Corning's Life 
Sciences division in 1993 and Executive Vice President and Chief Financial 
Officer of Quest Diagnostics in 1995. 



Executive Compensation 

   Historical Compensation. The following table sets forth information with 
respect to annual and long-term compensation expected to be paid by Quest 
Diagnostics and its subsidiaries to each of the chief executive officer and 
the four other most highly compensated executive officers (the "named 
executive officers") of Quest Diagnostics for services to be rendered in all 
capacities in fiscal year 1996 and such compensation paid or accrued during 
the years ended December 31, 1995 and December 31, 1994 for services rendered 
by each of the named executive officers. All references in the following 
tables to stock and stock options relate to awards of, and options to 
purchase, Corning Common Stock. 

                                      85 
<PAGE> 

                          SUMMARY COMPENSATION TABLE 

<TABLE>
<CAPTION>
                                                                                   Long-Term Compensation 
                                                                             ---------------------------------- 
                                              Annual Compensation                    Awards            Payouts 
                                      -----------------------------------    ----------------------    -------- 
                                                                            Restricted 
                                                             Other Annual      Stock     Securities   Incentive       All Other 
        Name and                       Salary     Bonus      Compensation      Awards    Underlying      Plan       Compensation 
   Principal Position        Year       (1)        (2)           (3)            (4)        Options     Payouts           (5) 
- ------------------------   -------    -------    -------     -------------    ---------    ---------   --------    
   --------------- 
<S>                        <C>        <C>        <C>         <C>             <C>           <C>         <C>         <C>
Kenneth W. Freeman,          1996      385,000    211,750       10,440             --           --          --          16,690 
  President and Chief        1995      316,667    249,918        7,200         326,926      87,000          --          14,057 
  Executive Officer          1994      240,000    244,634        6,900         406,766      20,000      162,679         13,376 
Robert A. Carothers,         1996      250,000    136,714        1,800             --           --          --           8,254 
  Vice President and         1995      173,000     68,337           --             --       16,500          --           8,561 
  Chief Financial Officer    1994      165,250     84,180           --             --        6,092          --           7,557 
Gregory C. Critchfield,      1996      310,000    182,900       40,909             --        2,000          --          65,690 
  Senior Vice President      1995 (6)   70,000    122,920           --             --        3,000          --           2,370 
  and Chief Medical and         
  Science Officer 
Don M. Hardison, Jr.,        1996      260,000    159,467        2,880             --       24,000          --          17,123 
  Senior Vice President- 
  Sales and Manufacturing 
Douglas M. VanOort,          1996      325,000    178,750        2,880             --           --          --           4,750 
  Senior Vice President-     1995      251,912     56,754        7,200          98,626      60,000          --           4,620 
  Operations                 1994      228,333    165,969        6,900         109,652      20,000          --           4,178 
</TABLE>

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

(1) Reflects for 1996 current salaries on an annualized basis, including 
    amounts deferred. 
(2) Reflects for 1996 projected performance-based annual cash compensation 
    awards at target levels. 
(3) Includes dividends on shares of restricted stock granted but not earned 
    within one year from date of grant and tax gross-up payments. 
(4) Messrs. Freeman, Carothers, Hardison and VanOort held an aggregate of 
    97,930, 2,500, 4,000 and 43,627 shares of restricted stock of Corning, 
    respectively, having an aggregate value on September 30, 1996 of 
    $3,819,270, $97,500, $156,000 and $1,701,453, respectively. Certain of 
    such shares, net of forfeitures, were subject to performance-based 
    conditions on vesting and are subject to forfeiture upon termination and 
    restrictions on transfer prior to stated dates. Certain other shares 
    ("Career Shares") are subject to restrictions on transfer until the 
    executive officer retires at or after age 60 and are subject to 
    forfeiture prior to age 60 in whole if such officer voluntarily 
    terminates employment with Quest Diagnostics and in part if such 
    officer's employment is terminated by Quest Diagnostics. On or prior to 
    the Distribution Date (a) all forfeiture conditions and transfer 
    restrictions will be removed from performance-based shares, (b) all 
    restrictions on transfer will be removed from shares which are no longer 
    subject to forfeiture and (c) Career Shares which are subject to 
    forfeiture conditions and transfer restrictions, except for 50% of such 
    shares held by Mr. Freeman, will be forfeited, and in lieu thereof 
    restricted shares and/or options to purchase shares of Quest Diagnostics 
    Common Stock will thereafter be granted pursuant to the terms of the 
    Quest Diagnostics Employee Equity Participation Plan (as defined below). 
    Dividends are paid to such individuals on all shares of restricted 
    Corning Common Stock held by them. 
(5) Includes the following amounts to be contributed by Quest Diagnostics to 
    the Quest Diagnostics Profit Sharing Plan (as defined below) for 1996: 
    $3,850 for Mr. Freeman, $4,283 for Mr. Hardison and $4,750 for Mr. 
    VanOort. Also includes $12,840 automobile allowance received by each of 
    Messrs. Freeman and Hardison and $9,480 for Dr. Critchfield. Also 
    includes 50% of a $100,000 interest-free loan made by Quest Diagnostics 
    to Dr. Critchfield together with imputed interest thereon, which loan is 
    to be forgiven over a two-year period provided Dr. Critchfield continues 
    to be employed by Quest Diagnostics and was made to assist Dr. 
    Critchfield in relocating to the New Jersey area. 
(6) Dr. Critchfield commenced employment with Quest Diagnostics in October 
    1995. 

  Option Grants. The following table sets forth certain information regarding 
options granted in 1995 (except for Mr. Hardison whose options were granted 
on February 7, 1996) to the named executive officers pursuant to Corning 
stock option plans. No other options were granted to the named executive 
officers in 1996. Employees of Quest Diagnostics who hold at the Distribution 
Date Corning stock options other than those granted on December 6, 1995 and 
February 7, 1996 will continue to hold Corning stock options following the 
Quest Diagnostics Spin-Off Distribution. It is anticipated that appropriate 
adjustments to the number of shares subject to options and to the exercise 
prices will be made to reflect the Quest Diagnostics Spin-Off Distribution. A 
portion of the options granted on December 6, 1995 and February 7, 1996 will 
be converted into options to purchase shares of Quest Diagnostics Common 
Stock ("New Options") under the Quest Diagnostics Stock Option Plan (as 
defined below). The remainder of the options granted on December 6, 1995 and 
February 7, 1996 will be cancelled. It is anticipated that such cancelled 
options will be replaced by options to be granted under the Quest Diagnostics 
Stock Option Plan. 

  The exercise prices and the number of shares of Quest Diagnostics Common 
Stock subject to New Options will be determined as of the time of the 
Distributions so as to preserve the investment basis and intrinsic gain 
associated with the Corning options surrendered as of the date of the Quest 
Diagnostics Spin-Off Distribution. Generally, the expiration dates and the 
dates on which New Options are exercisable will be identical to those under 
the corresponding Corning options at the time of the Distributions. Certain 
New Options will provide that upon 

                                      86 
<PAGE> 

exercise of such option through the surrender of previously owned shares of 
Quest Diagnostics Common Stock, the participant will be entitled to receive 
options covering the same number of shares so surrendered, with an exercise 
price equal to the fair market value of the shares at the time of the 
exercise of the New Option. 

                  OPTION/SAR GRANTS IN FISCAL YEAR 1995 (1) 

<TABLE>
<CAPTION>
                                                                                         Potential Realizable Value at 
                                                                                         Assumed Annual Rates of Stock 
                                                                                            Price Appreciation for 
                                                 Individual Grants                              Option Term (3) 
                                 -------------------------------------------------    ----------------------------------- 
                                 Number of     % of Total 
                                Securities       Options 
                                Underlying       Granted 
                                  Options     to Employees                             Gain 
                                  Granted       in Fiscal    Exercise   Expiration      at       Gain at        Gain at 
             Name                   (2)           Year         Price       Date       0% (4)       5%             10% 
- -----------------------------     ---------    ------------   -------     ---------  ------     ----------   ------------ 
<S>                              <C>           <C>            <C>        <C>         <C>       <C>           <C>
Kenneth W. Freeman                  87,000          2.6%       31.25     12/5/2005      0       1,709,807       4,332,987 
Robert A. Carothers                  1,500          0.0%       31.75      6/7/2005      0          29,951          75,902 
                                    15,000          0.4%       31.25     12/5/2005      0         294,794         747,067 
Gregory C. Critchfield               3,000          0.1%       27.50     10/3/2005      0          51,884         131,484 
Don M. Hardison, Jr.                24,000          0.7%       33.69      2/6/2006      0         508,499       1,288,636 
Douglas M. VanOort                  60,000          1.8%       31.25     12/5/2005      0       1,179,177       2,988,267 

All Optionees as a Group (4)     3,389,100        100.0%       31.34          2005      0      66,797,662     169,278,390 
</TABLE>

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

(1) No SARs were granted. 

(2) The stock option agreements with Messrs. Freeman, Carothers (with respect 
    to the 15,000 share grant), Hardison and VanOort provide that one-half of 
    the options will become exercisable on February 1, 1999 and all options 
    will become exercisable on February 1, 2000. The stock option agreement 
    with Dr. Critchfield provides that one-half of the options will become 
    exercisable on October 4, 1996 and all of the options will become 
    exercisable on October 4, 1997. The stock option agreement with Mr. 
    Carothers with respect to the 1,500 share grant provides that one-half of 
    the options became exercisable on June 6, 1996 and all of the options 
    will become exercisable on June 6, 1997. All such agreements also provide 
    that an additional option may be granted when the optionee uses shares of 
    Corning Common Stock to pay the purchase price of an option. The 
    additional option will be exercisable for the number of shares tendered 
    in payment of the option price, will be exercisable at the then fair 
    market value of the Corning Common Stock, will become exercisable only 
    after the lapse of twelve months and will expire on the expiration date 
    of the original option. 

(3) The dollar amounts set forth under these columns are the result of 
    calculations at 0% and at the 5% and 10% rates established by the 
    Commission and therefore are not intended to forecast future appreciation 
    of Corning Common Stock. 

(4) No gain to the optionees is possible without an appreciation in stock 
    price, an event which will also benefit all stockholders. If the stock 
    price does not appreciate, the optionees will realize no benefit. 

   Option Exercises and Fiscal Year-End Values. The following table sets 
forth the number of shares of Corning Common Stock covered by both 
exercisable and unexercisable stock options as of December 31, 1995, for the 
named executive officers. The named executive officers exercised no options 
in 1996. 

                                      87 
<PAGE> 

                  AGGREGATED OPTION/SAR EXERCISES IN FISCAL 
           YEAR 1995 AND 1995 FISCAL YEAR-END OPTION/SAR VALUES (1) 

<TABLE>
<CAPTION>
                                                           Number of Securities 
                                                          Underlying Unexercised            Value of Unexercised 
                                                                Options at                  In-the-Money Options 
                                                             Fiscal Year End                 At Fiscal Year End 
                                                       ----------------------------     ------------------------------ 
                              Shares 
                             Acquired       Value 
          Name             on Exercise     Realized    Exercisable    Unexercisable    Exercisable     Unexercisable 
- -----------------------    ------------   --------     -----------    -------------     -----------    --------------- 
<S>                        <C>            <C>          <C>            <C>              <C>             <C>
Kenneth W. Freeman               0             0         103,500         127,000         827,784          107,500 
Robert A. Carothers              0             0          12,483          15,749               0                0 
Gregory C. Critchfield           0             0               0           5,000               0           10,688 
Don M. Hardison, Jr.            --            --              --              --              --               -- 
Douglas M. VanOort               0             0          11,500          88,000          19,729           55,750 
</TABLE>

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

(1) There are no SARs outstanding. 

   Corporate Performance Plan Activity. Awards of performance-based shares of 
Corning Common Stock have been granted to Quest Diagnostics's executive 
officers pursuant to a series of performance-based plans (the "Corporate 
Performance Plan"). The Corporate Performance Plan provides the mechanisms to 
reward improvement in corporate performance as measured by net income, 
earnings per share and/or return on equity. Each year minimum, target and 
maximum goals are set and shares awarded (at target levels) which are subject 
to forfeiture in whole or in part if performance goals are not met. The 
percentage of awards that may be earned ranges from 0% to 150% of target. 
Shares earned remain subject to forfeiture and restrictions on transfer for 
two years following the end of the performance period. 

   The following table sets forth the number of performance-based shares 
awarded under the Corporate Performance Plan. The dollar value of shares 
earned for 1995 is reflected in the "Restricted Stock Awards" column of the 
Summary Compensation Table. 

   In late 1996, the Compensation Committee of the board of directors of 
Corning (the "Corning Board") will assess performance against goals, 
determine the number of shares earned of those granted on December 6, 1995 
and February 7, 1996 and remove all possibility of forfeiture and 
restrictions on transfer from such shares. 

                  CORPORATE PERFORMANCE PLAN ACTIVITY TABLE 

<TABLE>
<CAPTION>
                                            Number                                Number 
                                              of                      Number        of        Vesting Date 
                                  Grant     Shares    Performance    of Shares    Shares           of 
          Name            Year     Date    Granted       Period      Forfeited    Earned      Earned Shares 
- -----------------------   ----    -----   --------     ----------    ---------   --------    -------------- 
<S>                       <C>     <C>     <C>          <C>           <C>         <C>         <C>
Kenneth W. Freeman        1996    12/95     14,500        1996                                    2/99 
                          1995    12/94     10,000        1995                    10,740          2/98 
                          1994    12/93     10,000        1994                    14,690          2/97 
Robert A. Carothers       1996    12/95      2,500        1996                                    2/99 
                          1995                   0 
                          1994                   0 
Gregory C. Critchfield    1996                   0 
                          1995                   0 
Don M. Hardison, Jr.      1996     2/96      4,000        1996                                    2/99 
Douglas M. VanOort        1996    12/95     10,000        1996                                    2/99 
                          1995    12/94     10,000        1995         6,760       3,240          2/98 
                          1994    12/93      4,000        1994            40       3,960          2/97 
</TABLE>

   Variable Compensation. Quest Diagnostics has adopted, effective upon the 
Distributions, a variable compensation plan (the "Plan"), an annual incentive 
cash compensation plan for approximately 950 supervisory, management and 
executive employees similar to an annual performance plan currently 
maintained by Quest Diagnostics. The terms of the Plan are as follows. 

   The performance-based annual cash incentive awards payable under the Plan 
will be grounded in financial goals such as net income, cash flow, operating 
margin, return on equity, or earnings per share, or a combination 

                                      88 
<PAGE> 

thereof, and quantifiable non-financial goals. Each participant will be 
assigned a target award, as a percentage of base salary in effect at the end 
of the performance year for which the target is set, payable if the target is 
achieved. Actual results will be compared to the scale of targets with each 
gradation of desired result corresponding to a percentage, which will be 
multiplied by the employee's assigned target award. If the actual result is 
below target, awards will be less than target, down to a point below which no 
awards are earned. If the desired result is above target, awards will be 
greater than target, up to a stated maximum award. The maximum award assigned 
to the chief executive officer may not exceed 200% of base salary in effect 
on the date the Quest Diagnostics Compensation Committee sets the target for 
the performance year. The Quest Diagnostics Compensation Committee retains 
the right to reduce any award if it believes individual performance does not 
warrant the award calculated by reference to the result. 

   Employee Equity Participation Program. Quest Diagnostics has adopted, 
effective upon the Distributions, the Employee Equity Participation Program 
(the "Program") consisting of two plans: (a) a stock option plan (the "Quest 
Diagnostics Stock Option Plan") and (b) an incentive stock plan (the "Quest 
Diagnostics Incentive Stock Plan"). The Program is designed to provide a 
flexible mechanism to permit key employees of Quest Diagnostics and of any 
subsidiary to obtain significant equity ownership in Quest Diagnostics, 
thereby increasing their proprietary interest in the growth and success of 
Quest Diagnostics. 


   The Program, which will be administered by the Quest Diagnostics 
Compensation Committee, provides for the grant to eligible employees of 
either non-qualified or "incentive stock" options, or both, to purchase 
shares of Quest Diagnostics Common Stock at no less than fair market value on 
the date of grant. The Quest Diagnostics Compensation Committee may also 
provide that options may not be exercised in whole or in part for any period 
or periods of time; provided, however, that no option will be exercisable 
until at least twelve months from the date of grant. All options shall expire 
not more than ten years from the date of grant. Options will not be 
assignable or transferable except for limited circumstances on death. During 
the lifetime of the employee an option may be exercised only by him. The 
option price is payable upon exercise. The optionee may pay the option price 
in cash or with shares of Quest Diagnostics Common Stock owned by him. The 
optionee will have no rights as a stockholder with respect to the shares 
subject to option until shares are issued upon exercise of the option. The 
Quest Diagnostics Compensation Committee may grant options pursuant to which 
an optionee who uses shares of Quest Diagnostics Common Stock to pay the 
purchase price of an option will receive automatically on the date of 
exercise an additional option to purchase shares of Quest Diagnostics Common 
Stock. Such additional option will cover the number of shares tendered in 
payment of the option price, will be exercisable at the then fair market 
value of Quest Diagnostics Common Stock, will become exercisable only after 
the lapse of twelve months and will expire no later than the expiration date 
of the original option. 


   The Program also authorizes the Quest Diagnostics Compensation Committee 
to award to eligible employees shares, or the right to receive shares, of 
Quest Diagnostics Common Stock, the equivalent value in cash or a combination 
thereof (as determined by the Quest Diagnostics Compensation Committee). The 
Quest Diagnostics Compensation Committee shall determine the number of shares 
which are to be awarded to individual employees and the number of rights 
covering shares to be issued upon attainment of predetermined performance 
objectives for specified periods. The shares awarded directly to individual 
employees may be made subject to certain restrictions prohibiting sale or 
other disposition and may be made subject to forfeiture in certain events. 
Shares may be issued to recognize past performance either generally or upon 
attainment of specific objectives. Shares issuable for performance (based 
upon specific predetermined objectives) will be payable only to the extent 
that the Quest Diagnostics Compensation Committee determines that an eligible 
employee has met such objectives and will be valued as of the date of such 
determination. Upon issuance, such shares may (but need not) be made subject 
to the possibility of forfeiture or certain restrictions on transfer. 

   Key executive, managerial and technical employees (including officers and 
employees who are directors) of Quest Diagnostics and of any subsidiary will 
be eligible to participate in the Program and the plans thereunder. The 
selection of employees eligible to participate in any plan under the Program 
is within the discretion of the Quest Diagnostics Compensation Committee. 
Approximately 150 employees would have been eligible to participate in the 
plans under the Program had the Program been in effect in 1996. 

   Under the Program, the maximum number of shares of Quest Diagnostics 
Common Stock which may be optioned or granted to eligible employees will be 
3,000,000. Shares from expired or terminated options under the Quest 
Diagnostics Stock Option Plan will be available again for option grant under 
the Program. Shares which are 

                                      89
<PAGE> 

issued but not earned, or which are forfeited under the Quest Diagnostics 
Incentive Stock Plan, will be available again for issuance under the Program. 
The Program provides for appropriate adjustments in the aggregate number of 
shares subject to the Program and in the number of shares and the price per 
share, or either, of outstanding options in the case of changes in the 
capital stock of Quest Diagnostics resulting from any recapitalization, stock 
or unusual cash dividend, stock distribution, stock split or any other 
increase or decrease effected without receipt of consideration by Quest 
Diagnostics, or a merger or consolidation in which Quest Diagnostics is the 
surviving corporation. 

   The Program has a term of five years and no shares may be optioned or 
awarded and no rights to receive shares may be granted after the expiration 
of the Program. The Quest Diagnostics Board is authorized to terminate or 
amend the Program, except that it may not increase the number of shares 
available thereunder, decrease the price at which options may be granted, 
change the class of employees eligible to participate, or extend the term of 
the Program or options granted thereunder without the approval of the holders 
of a majority of the outstanding shares of Quest Diagnostics Common Stock. 

   Quest Diagnostics believes that the federal income tax consequences of the 
Program are as follows. An optionee who exercises a non-qualified option 
granted under the Quest Diagnostics Stock Option Plan will recognize 
compensation taxable as ordinary income (subject to withholding) in an amount 
equal to the difference between the option price and the fair market value of 
the shares on the date of exercise and Quest Diagnostics or the subsidiary 
employing the optionee will be entitled to a deduction from income in the 
same amount. The optionee's basis in such shares will be increased by the 
amount taxable as compensation, and his capital gain or loss when he disposes 
of the shares will be calculated using such increased basis. 
   
   If all applicable requirements of the Code with respect to incentive stock
options are met, no income to the optionee will be recognized and no deduction
will be allowable to Quest Diagnostics at the time of the grant or exercise of
an incentive stock option. The excess of the fair market value of the shares at
the time of exercise of an incentive stock option over the amount paid is an
item of tax preference which may be subject to the alternative minimum tax. In
general, if an incentive stock option is exercised three months or more after
termination of employment, the optionee will recognize ordinary income in an
amount equal to the difference between the option price and the fair market
value of the shares on the date of exercise and Quest Diagnostics or the
subsidiary employing the optionee will be entitled to a deduction in the same
amount. If the shares acquired subject to the option are sold within one year of
the date of exercise or two years from the date of grant, the optionee will
recognize ordinary income in an amount equal to the difference between the
option price and the lesser of the fair market value of the shares on the date
of exercise or the sale price and Quest Diagnostics or the employing subsidiary
will be entitled to a deduction from income in the same amount. Any excess of
the sale price over the fair market value on the date of exercise will be taxed
as a capital gain.
    
   Shares of Quest Diagnostics Common Stock which are not subject to 
restrictions and possibility of forfeiture and which are awarded to an 
employee under the Quest Diagnostics Incentive Stock Plan will be treated as 
ordinary income, subject to withholding, to an employee at the time of the 
transfer of the shares to him and the value of such awards will be deductible 
by Quest Diagnostics or by the subsidiary employing the employee at the same 
time in the same amount. Shares granted subject to restrictions and 
possibility of forfeiture will not be subject to tax nor will such grant 
result in a tax deduction for Quest Diagnostics at the time of award. 
However, when such shares become free of restrictions and possibility of 
forfeiture, the fair market value of such shares at that time (i) will be 
treated as ordinary income to the employee and (ii) will be deductible by 
Quest Diagnostics or by the subsidiary employing the employee. 

   The tax treatment upon disposition of shares acquired under the Program 
will depend upon how long the shares have been held and on whether or not the 
shares were acquired by exercising an incentive stock option. There are no 
tax consequences to Quest Diagnostics upon a participant's disposition of 
shares acquired under the Program, except that Quest Diagnostics may take a 
deduction equal to the amount the participant must recognize as ordinary 
income in the case of the disposition of shares acquired under incentive 
stock options before the applicable holding period has been satisfied. 


   Pension Plans. None of the executive officers of Quest Diagnostics is 
currently an active participant in a qualified defined benefit plan of Quest 
Diagnostics. 


   Prior to June 1, 1995, December 1, 1996 and January 1, 1995, respectively, 
Messrs. Freeman, Carothers and VanOort were eligible to participate in, and 
accrue benefits under, Corning's Salaried Pension Plan (the "Corning 

                                      90
<PAGE> 

Salaried Pension Plan"), a defined benefit plan, contributions to which are 
determined by Corning's actuaries and are not made on an individual basis. 
Benefits paid under this plan are based upon career earnings (regular salary 
and cash awards paid under Corning's variable compensation plans) and years 
of credited service. The Corning Salaried Pension Plan provides that salaried 
employees of Corning who retire on or after December 31, 1993 will receive 
pension benefits equal to the greater of (a) benefits provided by a formula 
pursuant to which they shall receive for each year of credited service an 
amount equal to 1.5% of annual earnings up to the social security wage base 
and 2% of annual earnings in excess of such base or (b) benefits calculated 
pursuant to a formula which provides that retirees will receive for each year 
of credited service prior to January 1, 1994 an amount equal to 1% of the 
first $24,000 of average earnings for the highest five consecutive years of 
annual earnings in the ten years of credited service immediately prior to 
1994 and 1.5% of such average earnings in excess of $24,000. Effective upon 
commencement of employment, salaried employees may contribute to the Corning 
Salaried Pension Plan 2% of their annual earnings up to the social security 
wage base. Such employees will receive for each year of credited service 
after December 31, 1990, in lieu of the amount described in (a) above, an 
amount equal to 2% of annual earnings. The benefit formula is reviewed and 
adjusted periodically for inflationary and other factors. 

   Corning maintains a non-qualified Executive Supplemental Pension Plan (the 
"Executive Supplemental Plan") pursuant to which it will pay to certain 
executives amounts approximately equal to the difference between the benefits 
provided for under the Corning Salaried Pension Plan and benefits which would 
have been payable thereunder but for the provisions of the Employee 
Retirement Income Security Act of 1974, as amended ("ERISA"). 

   It is anticipated that, prior to the Distribution Date, the Compensation 
Committee of the Corning Board will adopt a transferee supplemental pension 
plan (the "Transferee Supplemental Plan"), a nonqualified, unfunded defined 
benefit plan for the benefit of key employees and executive officers of Quest 
Diagnostics who are former employees of Corning, including Messrs. Freeman 
and VanOort, effective immediately after the Distribution Date. The 
Transferee Supplemental Plan will provide benefits approximately equal to the 
difference between the benefits provided for under the Corning Salaried 
Pension Plan and the Executive Supplemental Plan and benefits which would 
have been payable thereunder but for the termination of employment with 
Corning of such employees. 

   Maximum annual benefits calculated under the straight life annuity option 
form of pension payable to participants at age 65, the normal retirement age 
specified in the Corning Salaried Pension Plan, are illustrated in the table 
set forth below. The table below does not reflect any limitations on benefits 
imposed by ERISA. It is estimated that Messrs. Freeman and VanOort, who have 
25 and 15 years of credited service, respectively, would receive each year if 
they worked to age 65, the normal retirement age specified in the Corning 
Salaried Pension Plan, $256,170 and $165,332, respectively, under the Corning 
Salaried Pension Plan, the Executive Supplemental Plan and the Transferee 
Supplemental Plan. 

<TABLE>
<CAPTION>
                                         Years of Service 
                   -------------------------------------------------------------- 
Remuneration        15         20         25         30        35          40 
- --------------    -------    -------   -------    -------    -------    --------- 
<S>               <C>        <C>       <C>        <C>        <C>        <C>
   $ 100,000       20,500     27,300    34,100     41,000     47,800      55,300 
     200,000       43,000     57,300    71,600     86,000    100,300     115,300 
     300,000       65,500     87,300   109,100    131,000    152,800     175,300 
     400,000       88,000    117,300   146,600    176,000    205,300     235,300 
     500,000      110,500    147,300   184,100    221,000    257,800     295,300 
     600,000      133,000    177,300   221,600    266,000    310,300     355,300 
     700,000      155,500    207,300   259,100    311,000    362,800     415,300 
     800,000      178,000    237,300   296,600    356,000    415,300     475,300 
     900,000      200,500    267,300   334,100    401,000    467,800     535,300 
   1,000,000      223,000    297,300   371,600    446,000    520,300     595,300 
   1,100,000      245,500    327,300   409,100    491,000    572,800     655,300 
   1,200,000      268,000    357,300   446,600    536,000    625,300     715,300 
</TABLE>

   Quest Diagnostics Profit Sharing Plan. Most of the employees of Quest 
Diagnostics and its subsidiaries have been eligible to participate in a 
tax-qualified, defined contribution plan known as the Quest Diagnostics 
Profit Sharing Plan (the "Quest Diagnostics Profit Sharing Plan"), which 
provides for investment of employee contributions, including tax-deferred 
contributions under Section 401(k) of the Code, and matching contributions 
made by their employers, in several investment funds, including Corning 
Common Stock, at the employees' discretion. Effective as of the Distribution 
Date, Quest Diagnostics Common Stock will be added as an investment 

                                      91
<PAGE> 

fund and a portion of the employer matching contributions will automatically 
be invested in Quest Diagnostics Common Stock. Corning Common Stock will no 
longer be available as an investment fund except with respect to amounts 
already so invested under the Quest Diagnostics Profit Sharing Plan. 

   Effective as of the Distribution Date, the Quest Diagnostics Profit 
Sharing Plan will be amended to permit participating employees' employers to 
make discretionary contributions, other than matching contributions, to the 
Quest Diagnostics Profit Sharing Plan for the benefit of such employees, 
which contributions may be invested in Quest Diagnostics Common Stock. 

   Quest Diagnostics Employee Stock Ownership Plan. Quest Diagnostics has 
adopted, effective upon the Distributions, an employee stock ownership plan, 
as defined in Section 4975(e)(7) of the Code and related regulations and 
intended to qualify as a retirement plan under Section 401(a) of the Code, to 
be known as the Quest Diagnostics Employee Stock Ownership Plan (the "Quest 
Diagnostics ESOP"). 

   Most employees of Quest Diagnostics and its subsidiaries will become 
participants in the Quest Diagnostics ESOP after accruing six months of 
service. To the extent permitted under the Quest Diagnostics ESOP, Quest 
Diagnostics will contribute as of the Distribution Date an amount equal to a 
portion of each participating employee's annual compensation. Quest 
Diagnostics may in its discretion from time to time make additional 
contributions to the Quest Diagnostics ESOP for the benefit of participating 
employees. The assets of the Quest Diagnostics ESOP will be invested 
primarily in shares of Quest Diagnostics Common Stock. 

   Amounts contributed to the Quest Diagnostics ESOP for the benefit of 
participating employees will be 100% vested at age 65, the normal retirement 
age specified in the Quest Diagnostics ESOP, or at death, disability or 
termination of employment following completion of two years of credited 
service. Contributions to the Quest Diagnostics ESOP will not currently be 
taxable income to the participating employees and will not generally be 
available to them until termination of employment. 

   Employee Stock Purchase Plan. Quest Diagnostics has adopted, as of the 
Distribution Date, the Employee Stock Purchase Plan (the "Quest Diagnostics 
Stock Purchase Plan"), pursuant to which Quest Diagnostics may make available 
for sale to employees shares of its Common Stock at a price equal to 85% of 
the market value on the first or last day of each calendar quarter, whichever 
is lower. 

   The Quest Diagnostics Stock Purchase Plan, which will be administered by 
the Quest Diagnostics Compensation Committee, is designed to give eligible 
employees (generally, employees of Quest Diagnostics and its subsidiaries) 
the opportunity to purchase shares of Quest Diagnostics Common Stock through 
payroll deductions up to 10% of compensation in a series of quarterly 
offerings commencing January 1, 1997, and ending no later than December 31, 
2001. 

   Any eligible employee may elect to participate in the Quest Diagnostics 
Stock Purchase Plan on a quarterly basis and may terminate his payroll 
deduction at any time or increase or reduce prospectively the amount of his 
deduction at the beginning of any calendar quarter. At the end of each 
calendar quarter, a participating employee will purchase shares of Quest 
Diagnostics Common Stock with the funds deducted. The number of shares 
purchased will be a number determined by dividing the amount withheld by the 
lower of 85% of the closing price of a share of Quest Diagnostics Common 
Stock as reported in The Wall Street Journal on the first or last business 
day of the particular calendar quarter. An employee will have no interest in 
any shares of Quest Diagnostics Common Stock until such shares are actually 
purchased by him. 


   Under the Quest Diagnostics Stock Purchase Plan, the maximum number of 
shares of Quest Diagnostics Common Stock which may be purchased by eligible 
employees will be 2,000,000 shares, subject to adjustment in the case of 
changes in the capital stock of Quest Diagnostics resulting from any 
recapitalization, stock dividend, stock split or any other increase or 
decrease effected without receipt of consideration by Quest Diagnostics. 



   The Quest Diagnostics Stock Purchase Plan has a term of five years and no 
shares of Quest Diagnostics Common Stock may be offered for sale or sold 
under the Quest Diagnostics Stock Purchase Plan after the fifth anniversary 
of the effective date. The Quest Diagnostics Board is authorized to terminate 
or amend the Quest Diagnostics Stock Purchase Plan, except that it may not 
increase the number of shares of Quest Diagnostics Common Stock available 
thereunder, decrease the price at which such shares may be offered for sale 
or change the designation of subsidiaries eligible to participate in the plan 
without the approval of the holders of a majority of the shares of the 
capital stock of Quest Diagnostics cast at a meeting at which such matter is 
considered. 



                                      92
<PAGE> 


    Employment Agreements; Severance Arrangements. It is anticipated that Mr.
Freeman will enter into an employment agreement with Quest Diagnostics. The
agreement will expire on or before December 31, 1999. The agreement will include
provisions for an annual salary of no less than $500,000, with increases subject
to the discretion of the Quest Diagnostics Board; annual target participation in
the Variable Compensation Plan of Quest Diagnostics in amounts no less than 65%
of annual salary in effect at the time performance goals are established; and
severance payments following a termination by Mr. Freeman for "Good Reason" or
by Quest Diagnostics, without cause in accordance with the severance policy
described below, except that Mr. Freeman will receive three times his base
annual salary and three times his annual award of variable compensation. "Good
Reason" is defined as assignment of Mr. Freeman without his consent to mutually
inconsistent duties or responsibilities, a failure to re-elect Mr. Freeman to
the position of President and Chief Executive Officer, a greater than 75 mile
office relocation without his consent and a Change of Control (as detailed in
the next paragraph). The agreement will also include provision for reimbursement
of up to $10,000 per month until the earlier of Mr. Freeman's obtaining suitable
housing in the New York metropolitan area or June 30, 1998; eligibility for a
$400,000 interest-free relocation loan to be forgiven over a five-year period;
and, in the event the agreement is not renewed upon its expiration, a payment
equal to two times the highest annual cash compensation paid to Mr. Freeman
during the term of the agreement and health benefits for eighteen months
following expiration of the agreement. Mr. Freeman will also be entitled under
the agreement to a retirement pension benefit equivalent to benefits under the
Corning Salaried Pension Plan and the Executive Supplemental Plan based on not
less than 34 years of credited service in the event of termination for reasons
other than cause. Mr. Freeman's pension benefits will be initially secured by a
$5.4 million letter of credit (such amount based on initial assumptions for
pricing pension benefits) issued under the Credit Facility.



    On or before the Distribution Date, Quest Diagnostics will adopt a severance
policy pursuant to which it will provide to each executive officer other than
Mr. Freeman and Drs. Fisher and Gambino upon the termination of employment by
Quest Diagnostics other than for cause upon a determination that the business
needs of Quest Diagnostics require the replacement of such executive officer and
other than in connection with a change of control, compensation equal to two
times the executive officer's base annual salary at the annual rate in effect on
the date of termination and two times the annual award of variable compensation
at the most recent target level. Such executive officer will also be entitled to
participate in Quest Diagnostics' health and benefits plans (to the extent
permitted by the administrative provisions of such plans and applicable federal
and state law) for a period of up to two years or until such officer is covered
by a successor employer's benefit plans, whichever first occurs. Pursuant to
such policy, upon a change of control Quest Diagnostics will provide to each
such executive officer upon the termination of employment by Quest Diagnostics
other than for cause during the twelve months following a change in control,
compensation equal to three times annual base salary and three times the award
of annual variable compensation at the most recent target level and such officer
will be entitled to participate in Quest Diagnostics' health and benefit plans
for a period of up to three years or until such officer is covered by a
successor employer's benefits plans, whichever first occurs (to the extent
permitted by the administrative provisions of such plans and applicable federal
and state law). A "Change in Control" is defined in the policy to include the
following: the acquisition by a person of 20% or more of the voting stock of
Quest Diagnostics; the membership of the Quest Diagnostics Board changes as a
result of a contested election such that a majority of the Quest Diagnostics
Board members at any particular time were initially placed on the Quest
Diagnostics Board as a result of such contested election; or approval by Quest
Diagnostics' stockholders of a merger or consolidation in which Quest
Diagnostics is not the survivor thereof, or a sale or disposition of all or
substantially all of Quest Diagnostics' assets or a plan of partial or complete
liquidation. 


                    SECURITY OWNERSHIP BY CERTAIN BENEFICIAL
                   OWNERS AND MANAGEMENT OF QUEST DIAGNOSTICS


   All of the outstanding shares of Quest Diagnostics Common Stock are 
currently held by CLSI, which is wholly owned by Corning. The following table 
sets forth the number of shares of Quest Diagnostics Common Stock that are 
projected to be beneficially owned after the Quest Diagnostics Spin-Off 
Distribution by the directors, by the named executive officers and by all 
directors and executive officers of Quest Diagnostics as a group. The 
projections are based on the number of shares of Corning Common Stock held by 
such persons and such group as of October 31, 1996 (including certain 
restricted shares that may be forfeited prior to the Distribution Date but 
excluding Career Shares that will not receive the Distributions and Corning 
Common Stock held in the Quest Diagnostics Profit Sharing Plan and the 
Corning Investment Plans) and on the number of options to acquire Corning 
Common Stock held as of such date and exercisable within 60 days thereof. 
With respect to the shares of Quest Diagnostics Common 


                                      93
<PAGE> 

Stock, the number reflects the distribution ratio of one share of Quest
Diagnostics Common Stock for every eight shares of Corning Common Stock and with
respect to options the number reflects the actual number of shares of Corning
Common Stock subject to options. The stock options held by the directors and
executive officers of Quest Diagnostics will not affect the security ownership
of Quest Diagnostics unless (i) such options are exercised prior to the Record
Date and the underlying shares of Corning Common Stock are held on the Record
Date or (ii) such options are converted into options to purchase shares of Quest
Diagnostics Common Stock.



<TABLE>
<CAPTION>
                                 Number of Shares 
                                Beneficially Owned         Number of 
Name                                   (1)            Exercisable Options 
- ----------------------------    ------------------    ------------------- 
<S>                             <C>                   <C>
Van C. Campbell                      17,850 (2)             127,457 
Robert A. Carothers                     316                  12,483 
Gregory C. Critchfield                    0                   1,500 
David A. Duke                        10,878 (2)              82,000 
Kenneth W. Freeman                   14,461                 103,500 
Don M. Hardison, Jr.                    500                       0 
Douglas M. VanOort                    5,965                  11,500 
Gail R. Wilensky                      5,000 (2)                   0 
All Directors and Executive 
 Officers as a Group                 66,280                 393,562 
</TABLE>

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


(1) Does not include 3,954 shares owned by the spouses and minor children of 
    certain executive officers and directors (or trusts of which families of 
    such executive officers are beneficiaries) as to which such officers and 
    directors disclaim beneficial ownership. 
(2) Includes 5,000 shares of Quest Diagnostics Common Stock which each 
    non-employee director will receive in connection with their election but 
    does not include 750 shares of Quest Diagnostics Common Stock for each 
    year specified in the term of service as a director. See "Management of 
    Quest Diagnostics--Management-- Directors' Compensation." 



                                      94
<PAGE> 

                DESCRIPTION OF QUEST DIAGNOSTICS CAPITAL STOCK 

General 

   The following is a brief summary of certain provisions of the Quest 
Diagnostics Certificate, as the restated certificate of incorporation will be 
amended immediately prior to the Quest Diagnostics Spin-Off Distribution, and 
does not relate to or give effect to provisions of statutory or other law 
except as specifically stated. The Quest Diagnostics Certificate authorizes 
the issuance of 100,000,000 shares of Quest Diagnostics Common Stock. 
Approximately 28,901,735 shares of Quest Diagnostics Common Stock are 
expected to be outstanding immediately following the Quest Diagnostics 
Spin-Off Distribution. The rights of holders of shares of Quest Diagnostics 
Common Stock are governed by the Quest Diagnostics Certificate, the Quest 
Diagnostics By-Laws and by the DGCL. 

Voting Rights 

   Subject to the voting of any shares of Quest Diagnostics Series Preferred 
Stock (as defined below) that may be outstanding, voting power is vested in 
the Quest Diagnostics Common Stock, each share having one vote, and the Quest 
Diagnostics Voting Cumulative Preferred Stock, each $1,000 liquidation 
preference of which has one vote, voting together as a single class. 

Preemptive Rights 

   The Quest Diagnostics Certificate provides that no holder of shares of 
Quest Diagnostics Common Stock or Quest Diagnostics Series Preferred Stock 
shall have any preemptive rights except as the Quest Diagnostics Board may 
determine from time to time. No such rights have been granted by the Quest 
Diagnostics Board. 

Quest Diagnostics Common Stock 

   Liquidation Rights. Subject to the preferential rights of any outstanding 
Quest Diagnostics Series Preferred Stock and the Quest Diagnostics Voting 
Cumulative Preferred Stock, in the event of any liquidation of Quest 
Diagnostics, holders of shares of Quest Diagnostics Common Stock then 
outstanding are entitled to share ratably in the assets of Quest Diagnostics 
available for distribution to such holders. 

   Dividend Policy. Subject to any preferential rights of any outstanding 
Quest Diagnostics Series Preferred Stock or Quest Diagnostics Voting 
Cumulative Preferred Stock, such dividends as may be determined by the Quest 
Diagnostics Board may be declared and paid on the shares of Quest Diagnostics 
Common Stock from time to time out of any funds legally available therefor. 
It is currently contemplated that, following the Distributions, Quest 
Diagnostics will not pay cash dividends in the foreseeable future, but will 
retain earnings to provide funds for the operation and expansion of its 
business. Dividend decisions will be based upon a number of factors, 
including the operating results and financial requirements of Quest 
Diagnostics and such other considerations as the Quest Diagnostics Board 
deems relevant. In addition, the Quest Diagnostics Credit Facility prohibits 
Quest Diagnostics from paying cash dividends on the Quest Diagnostics Common 
Stock. Further, the Indenture under which the Notes will be issued will limit 
Quest Diagnostics' ability to pay cash dividends on the Quest Diagnostics 
Common Stock based on 50% of Quest Diagnostics' net income, plus a credit for 
issuances of capital stock. 

   Other Provisions. The shares of Quest Diagnostics Common Stock have no 
redemption, sinking fund or conversion privileges applicable thereto and 
holders of shares of Quest Diagnostics Common Stock are not liable to 
assessments or to further call. 


   Listing and Trading. Prior to the Distributions, there has been no public 
trading market for the Quest Diagnostics Common Stock although a "when 
issued" market is expected to develop prior to the Distribution Date. 
Application has been made to list the Quest Diagnostics Common Stock on the 
NYSE, subject to official notice of the Distributions, under the trading 
symbol "DGX." Prices at which Quest Diagnostics Common Stock may trade prior 
to the Distributions on a "when-issued" basis or after the Distributions 
cannot be predicted. Until shares of the Quest Diagnostics Common Stock are 
fully distributed and an orderly market develops, the prices at which trading 
in such stock occurs may fluctuate significantly. The prices at which Quest 
Diagnostics Common Stock will trade will be determined by the marketplace and 
may be influenced by many factors, including, among others, the depth and 
liquidity of the market for Quest Diagnostics Common Stock, investor 
perceptions of Quest Diagnostics, 



                                      95
<PAGE> 

the clinical laboratory testing business, and general economic and market 
conditions. Quest Diagnostics initially will have approximately 18,000 
stockholders of record, based on the number of holders of record of Corning 
Common Stock at the date of this Information Statement. The Transfer Agent 
and Registrar for the Quest Diagnostics Common Stock will be Harris Trust and 
Savings Bank. For certain information regarding options to purchase Quest 
Diagnostics Common Stock that may become outstanding after the Distributions, 
see "Management of Quest Diagnostics." 

Quest Diagnostics Series Preferred Stock 


   The Quest Diagnostics Certificate authorizes the issuance of up to 
10,000,000 shares of Quest Diagnostics Series Preferred Stock, par value 
$1.00 per share (the "Quest Diagnostics Series Preferred Stock"). The Quest 
Diagnostics Board has the authority to issue such shares from time to time, 
without stockholder approval, and to determine the designations, preferences, 
rights, including voting rights, and restrictions of such shares, subject to 
the DGCL. Pursuant to this authority, the Quest Diagnostics Board has 
designated 600,000 shares of Quest Diagnostics Series Preferred Stock as Quest 
Diagnostics Series A Preferred Stock and 1,000 shares of Quest Diagnostics 
Nonvoting Cumulative Preferred Stock. No other class of Quest Diagnostics 
Series Preferred Stock has been designated by the Quest Diagnostics Board. 


Voting Cumulative Preferred Stock 

   General. Prior to the Quest Diagnostics Spin-off Distribution, Quest 
Diagnostics will issue to Corning 1,000 shares of Voting Cumulative Preferred 
Stock, liquidation preference $1,000 per share (the "Quest Diagnostics Voting 
Cumulative Preferred Stock") without further stockholder approval. 

   Dividend Policy. Holders of shares of Quest Diagnostics Voting Cumulative 
Preferred Stock will be entitled to receive, when, as and if declared by the 
Quest Diagnostics Board out of funds legally available for the purpose, 
quarterly dividends payable in cash at the rate of 10% (the "Dividend Rate") 
per annum, provided, however, that the Dividend Rate per annum shall be the 
greater of (a) 10% and (b) the yield to maturity of the Notes expressed as a 
percentage plus 1%. 

   Voting Rights. The Quest Diagnostics Voting Cumulative Preferred Stock 
votes together with the Quest Diagnostics Common Stock as a single class and 
will have one vote per $1,000 liquidation preference. The Quest Diagnostics 
Cumulative Preferred Stock also votes as a separate class on any amendment to 
the Certificate of Incorporation which adversely affects the rights of the 
Quest Diagnostics Voting Cumulative Preferred Stock; provided, however, that 
any increase in the amount of authorized Quest Diagnostics Common Stock or 
authorized preferred stock or any increase or decrease in the number of 
shares of any series of preferred stock or the creation and issuance of other 
series of common stock or preferred stock shall not be deemed to adversely 
affect the rights of the Quest Diagnostics Voting Cumulative Preferred Stock. 

   Certain Restrictions. Whenever quarterly dividends or other dividends or 
distributions payable on the Quest Diagnostics Voting Cumulative Preferred 
Stock are in arrears, thereafter and until all accrued and unpaid dividends 
and distributions, whether or not declared, on shares of Quest Diagnostics 
Voting Cumulative Preferred Stock outstanding shall have been paid in full, 
Quest Diagnostics shall not: 

     (i) declare or pay dividends, or make any other distributions, on any 
   shares of stock ranking junior (either as to dividends or upon 
   liquidation, dissolution or winding-up) to the Quest Diagnostics Voting 
   Cumulative Preferred Stock; 

     (ii) declare or pay dividends, or make any other distributions, on any 
   shares of Parity Preferred Stock (as defined below) on which dividends are 
   payable or in arrears in proportion to the total amounts to which the 
   holders of all such shares are then entitled; 

     (iii) redeem or purchase or otherwise acquire for consideration shares 
   of any stock ranking junior (either as to dividends or upon liquidation, 
   dissolution or winding-up) to the Quest Diagnostics Voting Cumulative 
   Preferred Stock, provided that Quest Diagnostics may at any time redeem, 
   purchase or otherwise acquire shares of any such junior stock in exchange 
   for shares of any stock of Quest Diagnostics ranking junior (either as to 
   dividends or upon dissolution, liquidation or winding-up) to the Quest 
   Diagnostics Voting Cumulative Preferred Stock; or 

                                      96
<PAGE> 

     (iv) redeem or purchase or otherwise acquire for consideration any 
   shares of Quest Diagnostics Voting Cumulative Preferred Stock, or any 
   Parity Preferred Stock, except in accordance with a purchase offer made in 
   writing or by publication (as determined by the Quest Diagnostics Board) 
   to all holders of such shares upon such terms as the Quest Diagnostics 
   Board, after consideration of the respective annual dividend rates and 
   other relative rights and preferences of the respective series and 
   classes, shall determine in good faith will result in fair and equitable 
   treatment among the respective series or classes. 

   Quest Diagnostics shall not permit any subsidiary of Quest Diagnostics to 
purchase or otherwise acquire for consideration any shares of stock of Quest 
Diagnostics unless Quest Diagnostics could purchase or otherwise acquire such 
shares at such time and in such manner. 

   Liquidation Preference. The shares of Quest Diagnostics Voting Cumulative 
Preferred Stock shall rank, as to liquidation, dissolution or winding-up of 
Quest Diagnostics, prior to the shares of Quest Diagnostics Common Stock and 
any other class of stock of Quest Diagnostics ranking junior to the Quest 
Diagnostics Voting Cumulative Preferred Stock as to rights upon liquidation, 
dissolution or winding-up of Quest Diagnostics, so that in the event of any 
liquidation, dissolution or winding-up of Quest Diagnostics, whether 
voluntary or involuntary, the holders of the Quest Diagnostics Voting 
Cumulative Preferred Stock shall be entitled to receive out of the assets of 
Quest Diagnostics available for distribution to its shareholders, whether 
from capital, surplus or earnings, before any distribution is made to holders 
of shares of Quest Diagnostics Common Stock or any other such junior stock, 
an amount equal to $1,000 per share (the "Liquidation Preference" of a share 
of Quest Diagnostics Voting Cumulative Preferred Stock) plus an amount equal 
to all dividends (whether or not earned or declared) accrued and accumulated 
and unpaid on the shares of Quest Diagnostics Voting Cumulative Preferred 
Stock to the date of final distribution. The holders of the Quest Diagnostics 
Voting Cumulative Preferred Stock will not be entitled to receive the 
Liquidation Preference and such dividends until the liquidation preference of 
any other class of stock of Quest Diagnostics ranking senior to the Quest 
Diagnostics Voting Cumulative Preferred Stock as to rights upon liquidation, 
dissolution or winding-up shall have been paid (or a sum set aside therefor 
sufficient to provide for payment) in full. After payment of the full amount 
of the Liquidation Preference and such dividends, the holders of shares of 
Quest Diagnostics Voting Cumulative Preferred Stock will not be entitled to 
any further participation in any distribution of assets by Quest Diagnostics. 
If, upon any liquidation, dissolution or winding-up of Quest Diagnostics, the 
assets of Quest Diagnostics, or proceeds thereof, distributable among the 
holders of the shares of Quest Diagnostics Voting Cumulative Preferred Stock 
and Parity Preferred Stock shall be insufficient to pay in full the 
preferential amount aforesaid, then such assets, or the proceeds thereof, 
shall be distributable among such holders ratably in accordance with the 
respective amounts which would be payable on such shares if all amounts 
payable thereon were paid in full. For the purposes hereof, neither a 
consolidation or merger of Quest Diagnostics with or into any other 
corporation, nor a merger of any other corporation with or into Quest 
Diagnostics, nor a sale or transfer of all or any part of Quest Diagnostics' 
assets for cash or securities shall be considered a liquidation, dissolution 
or winding-up of Quest Diagnostics. 

   Conversion. The Quest Diagnostics Voting Cumulative Preferred Stock is not 
convertible into shares of any other class or series of stock of Quest 
Diagnostics. 

   Optional Redemption. The shares of the Quest Diagnostics Voting Cumulative 
Preferred Stock may be redeemed at the option of Quest Diagnostics, as a 
whole, or from time to time in part, at any time, out of funds legally 
available therefor, upon giving a notice or redemption at least 30 days prior 
to the date set for redemption; provided, however, that shares of the Quest 
Diagnostics Voting Cumulative Preferred Stock shall not be redeemable prior 
to December 31, 2002. Subject to the foregoing, on or after such date, shares 
of the Quest Diagnostics Voting Cumulative Preferred Stock are redeemable at 
the redemption prices per share (expressed as a percentage of the Liquidation 
Preference set forth below) plus an amount in cash equal to all dividends 
(whether or not earned or declared) accrued and accumulated and unpaid to, 
but excluding, the date fixed for redemption (the "Redemption Amount") if 
redeemed during the 12-month period beginning January 1 of each of the years 
set forth below: 

<TABLE>
<CAPTION>
<S>                            <C>
 Year                           Percentage 
- -------------------------      ------------ 
2003                            106.000% 
2004                            104.000% 
2005                            102.000% 
2006 and thereafter             100.000% 
</TABLE>

If Quest Diagnostics effects such redemption, it shall do so ratably 
according to the number of shares held by each holder of Quest Diagnostics 
Voting Cumulative Preferred Stock. 

                                      97
<PAGE> 

  Mandatory Redemption. On January 1, 2022, Quest Diagnostics shall redeem 
all of the then outstanding shares of Quest Diagnostics Voting Cumulative 
Preferred Stock, out of funds legally available therefor at a redemption 
price equal to the Liquidation Preference. The redemption payment for each 
share of Quest Diagnostics Voting Cumulative Preferred Stock shall be the 
Redemption Amount, in cash, as of January 1, 2022. 

  Authorization and Issuance of Other Securities. No consent of the holders 
of the Quest Diagnostics Voting Cumulative Preferred Stock shall be required 
for (a) the creation of any indebtedness of any kind of Quest Diagnostics, 
(b) the creation, or increase or decrease in the amount, of any class or 
series of stock of Quest Diagnostics ranking on a parity with, senior to or 
junior to the Quest Diagnostics Voting Cumulative Preferred Stock as to the 
payment of dividends or amounts upon liquidation, dissolution or winding up 
or (c) any increase or decrease in the amount of authorized Common Stock or 
any increase, decrease or change in the par value thereof or in any other 
terms thereof. 

Rank. The Quest Diagnostics Voting Cumulative Preferred Stock will rank 
senior to the Quest Diagnostics Common Stock and the Series A Preferred 
Stock, on a parity with any series of preferred stock ranking on a parity 
with the Quest Diagnostics Voting Cumulative Preferred Stock as to the 
payment of dividends and amounts upon liquidation, dissolution and winding-up 
(a "Parity Preferred Stock"), and junior to all other series of preferred 
stock that do not expressly provide that such series is to rank junior to or 
on a parity with the Quest Diagnostics Voting Cumulative Preferred Stock. 

Preferred Share Purchase Rights 

   Attached to each share of Quest Diagnostics Common Stock is one right 
("Quest Diagnostics Right"), which entitles the registered holder to purchase 
from Quest Diagnostics one one-hundredth of a share of Quest Diagnostics 
Series A Preferred Stock at a price of $35 per one-hundredth of a share of 
Quest Diagnostics Series A Preferred Stock (the "Exercise Price"), subject to 
adjustment. The Quest Diagnostics Rights expire on December 31, 2006 (the 
"Final Expiration Date"), unless the Final Expiration Date is extended or 
unless the Quest Diagnostics Rights are earlier exercised. 

   The Quest Diagnostics Rights represented by the certificates for shares of 
Quest Diagnostics Common Stock are not exercisable, and are not transferable 
apart from the shares of Quest Diagnostics Common Stock, until the earlier of 
(1) ten days following the public announcement by Quest Diagnostics or an 
Acquiring Person (as defined below) that a person or group has acquired 
beneficial ownership of 20% or more of the shares of Quest Diagnostics Common 
Stock (an "Acquiring Person") or (2) ten business days (or such later date as 
the Quest Diagnostics Board may determine prior to such time as any person or 
group of affiliated persons becomes an Acquiring Person) after the 
commencement or first public announcement of an intention to make a tender or 
exchange offer that would result in a person or group beneficially owning 20% 
or more of the shares of Quest Diagnostics Common Stock (the earlier of such 
dates being called the "Rights Distribution Date"). The Quest Diagnostics 
Board has the authority to determine that a person that has inadvertently 
acquired beneficial ownership of 20% of the shares of Quest Diagnostics 
Common Stock is not an Acquiring Person if such person promptly reduces its 
ownership interest to below 20%. Separate certificates for the Quest 
Diagnostics Rights will be mailed to holders of record of the shares of Quest 
Diagnostics Common Stock as of such date. The Quest Diagnostics Rights could 
then begin trading separately from the shares of Quest Diagnostics Common 
Stock. 

   Generally, in the event that a person or group becomes an Acquiring 
Person, each Quest Diagnostics Right (other than the Quest Diagnostics Rights 
owned by the Acquiring Person and certain affiliated persons) will thereafter 
entitle the holder to receive, upon exercise of the Quest Diagnostics Right, 
shares of Quest Diagnostics Common Stock having a value equal to two times 
the Exercise Price of the Quest Diagnostics Right. In the event that a person 
or group becomes an Acquiring Person (but prior to such time as such person 
or group beneficially owns 50% or more of the outstanding shares of Quest 
Diagnostics Common Stock), the Quest Diagnostics Board may exchange each 
Quest Diagnostics Right and each one one-hundredth of a share of Quest 
Diagnostics Series A Preferred Stock (other than Quest Diagnostics Rights and 
Quest Diagnostics Series A Preferred Stock owned by the Acquiring Person and 
certain affiliated persons) for one share of Quest Diagnostics Common Stock. 
In the event that Quest Diagnostics is acquired in a merger, consolidation, 
or other business combination transaction or more than 50% of Quest 
Diagnostics' assets, cash flow or earning power is sold or transferred, each 
Quest Diagnostics Right (other than the Quest Diagnostics Rights owned by an 
Acquiring Person and certain affiliated persons) will thereafter entitle the 
holder thereof to receive, upon the exercise of the Quest Diagnostics Right, 

                                      98
<PAGE> 

common stock of the acquiring corporation having a value equal to two times 
the Exercise Price of the Quest Diagnostics Right. 

   The Quest Diagnostics Rights are redeemable in whole, but not in part, at 
$.01 per Quest Diagnostics Right at any time prior to any person or group 
becoming an Acquiring Person. The right to exercise the Quest Diagnostics 
Rights terminates at the time that the Quest Diagnostics Board elects to 
redeem the Quest Diagnostics Rights. Notice of redemption shall be given by 
mailing such notice to the registered holders of the Quest Diagnostics 
Rights. At no time will the Quest Diagnostics Rights have any voting rights. 
The Quest Diagnostics Rights Agent is Harris Trust and Savings Bank (the 
"Quest Diagnostics Rights Agent"). 

   The exercise price payable, and the number of shares of Quest Diagnostics 
Series A Preferred Stock or other securities or property issuable, upon 
exercise of the Quest Diagnostics Rights are subject to adjustment from time 
to time to prevent dilution (i) in the event of a stock dividend on, or a 
subdivision, combination or reclassification of, the shares of Quest 
Diagnostics Series A Preferred Stock, (ii) upon the grant to holders of the 
shares of Quest Diagnostics Series A Preferred Stock of certain rights or 
warrants to subscribe for or purchase shares of Quest Diagnostics Series A 
Preferred Stock at a price, or securities convertible into shares of Quest 
Diagnostics Series A Preferred Stock with a conversion price, less than the 
then current market price of the shares of Quest Diagnostics Series A 
Preferred Stock or (iii) upon the distribution to holders of the shares of 
Quest Diagnostics Series A Preferred Stock of evidences of indebtedness or 
assets (excluding regular periodic cash dividends paid out of earnings or 
retained earnings or dividends payable in shares of Quest Diagnostics Series 
A Preferred Stock) or of subscription rights or warrants (other than those 
referred to above). 

   The number of outstanding Quest Diagnostics Rights and the number of one 
one-hundredths of a share of Quest Diagnostics Series A Preferred Stock 
issuable upon exercise of each Quest Diagnostics Right are also subject to 
adjustment in the event of a stock split of, or stock dividend on, or 
subdivision, consolidation or combination of, the shares of Quest Diagnostics 
Common Stock prior to the Quest Diagnostics Rights Distribution Date. With 
certain exceptions, no adjustment in the exercise price will be required 
until cumulative adjustments require an adjustment of at least 1% in such 
exercise price. 

   Upon exercise of the Quest Diagnostics Rights, no fractional shares of 
Quest Diagnostics Series A Preferred Stock will be issued (other than 
fractions which are integral multiples of one one-hundredth of a share, which 
may, at the election of Quest Diagnostics, be evidenced by depository 
receipts) and in lieu thereof an adjustment in cash will be made. 

   The Quest Diagnostics Rights have certain antitakeover effects. The Quest 
Diagnostics Rights may cause substantial dilution for a person or group that 
attempts to acquire Quest Diagnostics on terms not approved by the Quest 
Diagnostics Board, except pursuant to an offer conditioned on a substantial 
number of Quest Diagnostics Rights being acquired. The Quest Diagnostics 
Rights should not interfere with any merger or other business combination 
approved by the Quest Diagnostics Board since the Quest Diagnostics Rights 
may be redeemed by Quest Diagnostics at $.01 per Quest Diagnostics Right 
prior to the acquisition by a person or group of beneficial ownership of 20% 
or more of the shares of Quest Diagnostics Common Stock. 

   
   The shares of Quest Diagnostics Series A Preferred Stock purchasable upon 
exercise of the Quest Diagnostics Rights will rank junior to all other series 
of Quest Diagnostics'preferred stock or any similar stock that specifically 
provides that they shall rank prior to the shares of Quest Diagnostics Series 
A Preferred Stock. The shares of Quest Diagnostics Series A Preferred Stock 
will be nonredeemable. Each share of Quest Diagnostics Series A Preferred 
Stock will be entitled to a minimum preferential quarterly dividend of $10 per 
share, but will be entitled to an aggregate dividend of 100 times the 
dividend declared per share of Quest Diagnostics Common Stock. In the event 
of liquidation, the holders of the shares of Quest Diagnostics Series A 
Preferred Stock will be entitled to a minimum preferential liquidation 
payment of $100 per share, but will be entitled to an aggregate payment of 100 
times the payment made per share of Quest Diagnostics Common Stock. Each 
share of Quest Diagnostics Series A Preferred Stock will have 100 votes, 
voting together with the shares of Quest Diagnostics Common Stock. In the 
event of any merger, consolidation or other transaction in which shares of 
Quest Diagnostics Common Stock are exchanged, each share of Quest Diagnostics 
Series A Preferred Stock will be entitled to receive 100 times the amount and 
type of consideration received per share of Quest Diagnostics Common Stock. 
These rights are protected by customary antidilution provisions. Because of 
the nature of the Quest Diagnostics Series A Preferred Stock's dividend, 
liquidation and voting rights, the value of the interest in a share of Quest 
Diagnostics Series A Preferred Stock 
    

                                      99
<PAGE> 

purchasable upon the exercise of each Quest Diagnostics Right approximates 
the value of one share of Quest Diagnostics Common Stock. 

   The foregoing description of the Quest Diagnostics Rights, which describes 
all of the material terms of the Quest Diagnostics Rights, does not purport 
to be complete and is qualified in its entirety by reference to the 
description of the Quest Diagnostics Rights contained in the Quest 
Diagnostics Rights Agreement, dated as of December 31, 1996 between Quest 
Diagnostics and the Quest Diagnostics Rights Agent, which agreement has been 
filed as an exhibit to Quest Diagnostics' registration statement on Form 10 
(the "Quest Diagnostics Form 10") that Quest Diagnostics has filed with the 
Commission. Prior to the Quest Diagnostics Rights Distribution Date, the 
Quest Diagnostics Rights Agreement may be amended in any respect. After the 
Quest Diagnostics Rights Distribution Date, the Quest Diagnostics Rights 
Agreement may be amended in any respect that does not adversely affect the 
Quest Diagnostics Rights holders. 

Restrictions on Transfer 

   Shares of the Quest Diagnostics Common Stock distributed to Corning 
shareholders will be freely transferable, except for shares received by any 
persons who may be deemed to be "affiliates" of Quest Diagnostics as that 
term is defined in Rule 144 promulgated under the Securities Act, which 
shares will remain subject to the resale limitations of Rule 144. Persons who 
may be deemed to be affiliates of Quest Diagnostics after the Quest 
Diagnostics Spin-off Distribution generally include individuals or entities 
that control, are controlled by, or are under common control with Quest 
Diagnostics and may include certain officers and directors of Quest 
Diagnostics as well as principal stockholders of Quest Diagnostics. Persons 
who are affiliates of Quest Diagnostics will be permitted to sell their 
shares of Quest Diagnostics only pursuant to an effective registration 
statement under the Securities Act or an exemption from the registration 
requirements of the Securities Act, such as the exemption provided by Section 
4(1) of the Securities Act or Rule 144 thereunder. The Section 4(1) exemption 
allows the sale of unregistered shares by a person who is not an issuer, an 
underwriter or a dealer. Rule 144 provides persons who are not issuers with 
objective standards for selling restricted securities and securities held by 
affiliates without registration. The rule requires (1) current public 
information be available concerning the issuer; (2) volume limitations be 
placed on sales during any three-month period; and (3) compliance with 
certain manner of sale restrictions. The amount of the Quest Diagnostics 
Common Stock which could be sold under Rule 144 during a three-month period 
cannot exceed the greater of (1) 1% of the outstanding shares of Quest 
Diagnostics Common Stock, or (2) the average weekly trading volume for the 
shares for a four-week period prior to the date that notice of the sale is 
filed with the Commission. 

                                       100
<PAGE> 

              ANTITAKEOVER EFFECTS OF CERTAIN PROVISIONS OF THE 
          QUEST DIAGNOSTICS CERTIFICATE OF INCORPORATION AND BY-LAWS 

General 

   In addition to the Quest Diagnostics Rights, the Quest Diagnostics 
Certificate and the Quest Diagnostics By- Laws contain other provisions that 
may discourage a third party from seeking to acquire Quest Diagnostics, or to 
commence a proxy contest or other takeover-related action. These provisions, 
which are in all material respects identical to the provisions contained in 
the certificate of incorporation and By-Laws of Corning, are intended to 
enhance the likelihood of continuity and stability in the composition of the 
Quest Diagnostics Board and in the policies formulated by the Quest 
Diagnostics Board and to discourage certain types of transactions that may 
involve an actual or threatened change of control of Quest Diagnostics. These 
provisions are designed to reduce the vulnerability of Quest Diagnostics to 
an unsolicited acquisition proposal and also to discourage certain tactics 
that may be used in proxy fights. Because such provisions could have the 
effect of discouraging potential acquisition proposals, they may consequently 
inhibit fluctuations in the market price of Quest Diagnostics Common Stock 
which could result from actual or rumored takeover attempts. Such provisions 
also may have the effect of preventing changes in the management of Quest 
Diagnostics. See "Risk Factors--Risks Relating to Quest Diagnostics-- Certain 
Antitakeover Effects." 

Board of Directors 

   The Quest Diagnostics Certificate provides that, effective as of the Quest 
Diagnostics Spin-Off Distribution, the Quest Diagnostics Board is divided 
into three classes, with the classes to be nearly as equal as possible. One 
class has a term expiring at the 1998 annual meeting of stockholders of Quest 
Diagnostics; the second class has a term expiring at the 1999 annual meeting 
of stockholders of Quest Diagnostics; and the third class has a term expiring 
at the 2000 annual meeting of stockholders of Quest Diagnostics. At each 
annual meeting of stockholders, one class of the Quest Diagnostics Board will 
be elected for a three-year term. The classification of directors has the 
effect of making it more difficult to change the composition of the Quest 
Diagnostics Board. At least two annual meetings of stockholders, instead of 
one, generally will be required to effect a change in the majority of the 
Quest Diagnostics Board. The Quest Diagnostics Board believes that the longer 
time required to elect a majority of a classified board will help ensure the 
continuity and stability of Quest Diagnostics' management and policies, 
because in most cases a majority of the directors at any given time will have 
had prior experience as directors of Quest Diagnostics. 

   Under the DGCL, unless the certificate of incorporation otherwise 
provides, a director on a classified board may only be removed by the 
stockholders for cause. The Quest Diagnostics Certificate provides that a 
director of Quest Diagnostics is only removable by the stockholders for 
cause. The Quest Diagnostics Certificate limits the number of directors to 
twelve and requires that any vacancies on the Quest Diagnostics Board be 
filled only by a majority of the entire Quest Diagnostics Board. The 
provisions of the DGCL and the Quest Diagnostics Certificate relating to the 
removal of directors and the filling of vacancies on the Quest Diagnostics 
Board preclude a third party from removing incumbent directors without cause 
and simultaneously gaining control of the Quest Diagnostics Board by filling, 
with its own nominees, the vacancies created by removal. These provisions 
also reduce the power of stockholders generally, even those with a majority 
voting power in Quest Diagnostics, to remove incumbent directors and to fill 
vacancies on the Quest Diagnostics Board without the support of the incumbent 
directors. 

Stockholder Action and Special Meetings 

   The Quest Diagnostics Certificate provides that all stockholder actions to 
be effected by written consent and not a duly called meeting must be effected 
by the unanimous written consent of all stockholders entitled to consent 
thereto. This provision reduces the power of the Quest Diagnostics 
stockholders and precludes a stockholder of Quest Diagnostics from conducting 
any form of consent solicitation. The Quest Diagnostics Certificate also does 
not permit stockholders of Quest Diagnostics to call special meetings of 
stockholders. 

Advance Notice Requirements for Stockholder Proposals and Director 
Nominations 

   The Quest Diagnostics By-Laws contain an advance notice procedure with 
respect to the nomination, other than by or at the direction of the Quest 
Diagnostics Board or a committee thereof, of candidates for election as 

                                     101
<PAGE> 

directors as well as for other stockholder proposals to be considered at annual
meetings of stockholders. Delivery of a notice with the required information
must be delivered to the Secretary of Quest Diagnostics not later than 60 days
nor more than 90 days prior to the date of the stockholders' meeting at which
the nomination or other proposal is to be considered. No matters can be
considered at special meetings of the stockholders other than such matters as
are set forth in the notice of meeting. Although the notice provisions do not
give the Quest Diagnostics Board any power to approve or disapprove stockholder
nominations or proposals for action by Quest Diagnostics, they may have the
effect of (i) precluding a contest for the election of directors or the
consideration of stockholder proposals if the procedures established by the
Quest Diagnostics By-Laws are not followed and (ii) discouraging or deterring
any third party from conducting a solicitation of proxies to elect its own slate
of directors or to approve its proposals, without regard to whether
consideration of such nominees or proposals might be harmful or beneficial to
Quest Diagnostics and its stockholders. The purpose of requiring advance notice
is to afford the Quest Diagnostics Board an opportunity to consider the
qualifications of the proposed nominees or the merits of other stockholder
proposals and, to the extent deemed necessary or desirable by the Quest
Diagnostics Board, to inform stockholders about those matters.

Business Combinations with Interested Stockholders 

   Paragraph 6 of the Quest Diagnostics Certificate (the "Fair Price Amendment")
requires the approval by the holders of at least 80% of the voting power of the
outstanding capital stock of Quest Diagnostics entitled to vote generally in the
election of directors (the "Quest Diagnostics Voting Stock") as a condition for
mergers and certain other Business Combinations (as defined below) with any
beneficial owner of more than 10% of such voting power (an "Interested
Stockholder") unless (i) the transaction is approved by at least a majority of
the Continuing Directors (as defined below) or (ii) certain minimum price, form
of consideration and procedural requirements are met.

   An Interested Stockholder, in general, is defined as any person or group who
is, or was at any time within the two-year period immediately prior to the date
in question, the beneficial owner of more than 10% of the voting power of the
Quest Diagnostics Voting Stock. The term "beneficial owner" includes persons
directly or indirectly owning or having the right to acquire or vote the shares.
In certain circumstances, an Interested Stockholder could include persons or
entities affiliated or associated with the Interested Stockholder.

   A Business Combination generally includes the following transactions: (i) a
merger or consolidation of Quest Diagnostics or any subsidiary with an
Interested Stockholder; (ii) the sale or other disposition by Quest Diagnostics
or a subsidiary of assets having an aggregate fair market value of $20,000,000
or more if an Interested Stockholder is a party to the transaction; (iii) the
issuance or transfer of stock or other securities of Quest Diagnostics or of a
subsidiary to an Interested Stockholder in exchange for cash or property
(including stock or other securities) having an aggregate fair market value of
$20,000,000 or more; (iv) the adoption of any plan or proposal for the
liquidation or dissolution of Quest Diagnostics proposed by or on behalf of an
Interested Stockholder; (v) any reclassification of securities,
recapitalization, merger or consolidation with a subsidiary or other transaction
which has the effect, directly or indirectly, of increasing the percentage of
the outstanding stock of any class of Quest Diagnostics or a subsidiary owned by
an Interested Stockholder; or (vi) any agreement, contract or other arrangement
providing for any one or more of the foregoing actions.

   
   A Continuing Director is in general (i) any member of the Quest Diagnostics
Board who is not an Interested Stockholder or affiliated or associated with an
Interested Stockholder and was a director of Quest Diagnostics prior to the time
the Interested Stockholder became an Interested Stockholder, (ii) any successor
to such a Continuing Director who is not affiliated or associated with an
Interested Stockholder and was recommended or elected by a majority of the
Continuing Directors then on the Quest Diagnostics Board, or (iii) any person
who was a director of Quest Diagnostics as of the Distribution Date and any
successor thereto who was recommended or elected by a majority of the Continuing
Directors then on the Quest Diagnostics Board. It is possible that the approval
of a majority of the Continuing Directors could be required in circumstances
where the Continuing Directors constitute less than a quorum of the entire Quest
Diagnostics Board.
    

   The 80% affirmative stockholder vote would not be required if the Business 
Combination in question had been approved by a majority of the Continuing 
Directors or if all the minimum price, form of consideration and procedural 
requirements described below are satisfied. 

   Minimum Price and Form of Consideration Requirements. In a Business
Combination involving cash or other consideration being paid to Quest
Diagnostics' stockholders, the consideration required, in the case of each class

                                      102
<PAGE> 

of Quest Diagnostics Voting Stock, would be either cash or the same type of 
consideration used by the Interested Stockholder in acquiring the largest 
portion of its share of that class of Quest Diagnostics Voting Stock prior to 
the first public announcement of the proposed Business Combination. In 
addition, such consideration would be required to meet the minimum price 
requirements described below. 

   In the case of payments to holders of Quest Diagnostics Common Stock, the 
fair market value per share of such payments would be at least equal in value 
to the higher of (i) the highest per share price paid by the Interested 
Stockholder in acquiring any shares of Quest Diagnostics Common Stock during 
the two years prior to the first public announcement of the proposed Business 
Combination (the "Announcement Date") or in the transaction in which it 
became an Interested Stockholder, whichever is higher, and (ii) the fair 
market value per share of Quest Diagnostics Common Stock on the Announcement 
Date or on the date on which the Interested Stockholder became an Interested 
Stockholder, whichever is higher. 

   In the case of payments to holders of any series of Quest Diagnostics' 
voting Series Preferred Stock, if any, the fair market value per share of 
such payments would have to be at least equal to the higher of (i) the price 
per share determined with respect to shares of such series in the same manner 
as described in the preceding paragraph with respect to shares of Common 
Stock and (ii) the highest preferential amount per share to which the holders 
of such series of Quest Diagnostics Series Preferred Stock are entitled in 
the event of a voluntary or involuntary liquidation of Quest Diagnostics. 

   If the transaction does not involve any cash or other property being 
received by any of the other stockholders, such as a sale of assets or an 
issuance of Quest Diagnostics' securities to an Interested Stockholder, then 
the minimum price, form of consideration and procedural requirements would 
not apply, but an 80% vote of stockholders would still be required unless the 
transaction was approved by a majority of the Continuing Directors. 

   Procedural Requirements. An 80% stockholder vote would be required to 
authorize a Business Combination with an Interested Stockholder if Quest 
Diagnostics, after the interested stockholder became an Interested 
Stockholder, had failed to pay full quarterly dividends on its Preferred 
Stock, if any, or reduced the rate of dividends paid on its Common Stock, 
unless such failure or reduction was approved by a majority of the Continuing 
Directors. 

   An 80% stockholder vote to authorize a Business Combination with an 
Interested Stockholder would also be required if the Interested Stockholder 
had acquired any additional shares of the Quest Diagnostics Voting Stock, 
directly from Quest Diagnostics or otherwise, in any transaction subsequent 
to the transaction pursuant to which it became an Interested Stockholder. 

   The receipt by the Interested Stockholder at any time after it became an 
Interested Stockholder, whether in connection with the proposed Business 
Combination or otherwise, of the benefit of any loans or other financial 
assistance or tax advantages provided by Quest Diagnostics (other than 
proportionately as a stockholder) would also trigger the 80% stockholder vote 
requirement to authorize a Business Combination with an Interested 
Stockholder (unless the Business Combination was approved by a majority of 
the Continuing Directors). 

   In summary, none of the minimum price, form of consideration or procedural 
requirements described above would apply in the case of a Business 
Combination approved by a majority of the Continuing Directors. In the 
absence of such approval, all of such requirements would have to be satisfied 
to avoid the 80% stockholder vote requirements. 

Amendment of the Quest Diagnostics Certificate 

   Amendment or repeal of the provisions of the Quest Diagnostics Certificate 
described above or the adoption of any provision inconsistent therewith would 
require the affirmative vote of at least 80% of the Quest Diagnostics Voting 
Stock unless the proposed amendment or repeal or the adoption of the 
inconsistent provisions are approved by two-thirds of the entire Quest 
Diagnostics Board and a majority of the Continuing Directors. 

Antitakeover Statutes 

   Section 203 of the DGCL prohibits transactions between a Delaware 
corporation and an "interested stockholder," which is defined therein as a 
person who, together with any affiliates and/or associates of such person, 
beneficially owns, directly or indirectly, 15% or more of the outstanding 
voting shares of a Delaware corporation. This provision prohibits certain 
business combinations (defined broadly to include mergers, consolidations, 
sales 

                                     103
<PAGE> 

or other dispositions of assets having an aggregate value in excess of 10% of 
the consolidated assets of the corporation, and certain transactions that 
would increase the interested stockholder's proportionate share ownership in 
the corporation) between an interested stockholder and a corporation for a 
period of three years after the date the interested stockholder acquired its 
stock unless (i) the business combination is approved by the corporation's 
board of directors prior to the date the interested stockholder acquired 
shares, (ii) the interested stockholder acquired at least 85% of the voting 
stock of the corporation in the transaction in which it becomes an interested 
stockholder, or (iii) the business combination is approved by a majority of 
the board of directors and by the affirmative vote of 66 2/3% of the votes 
entitled to be cast by disinterested stockholders at an annual or special 
meeting. The Quest Diagnostics Certificate and the Quest Diagnostics By-Laws 
do not exclude Quest Diagnostics from the restrictions imposed under Section 
203 of the DGCL. 

Tax Sharing and Indemnification Agreements 

   The corporate tax liability which potentially could arise from an 
acquisition of shares of Quest Diagnostics capital stock or assets of Quest 
Diagnostics for a period of time following the Quest Diagnostics Spin-Off 
Distribution, together with the related indemnification arrangements 
contained in the Tax Sharing and Spin-Off Tax Indemnification Agreements, 
could have an antitakeover effect on the acquisition of control of Quest 
Diagnostics. See "The Relationship Among Corning, Quest Diagnostics and 
Covance After the Distributions--Tax Sharing Agreement" and "The Relationship 
Among Corning, Quest Diagnostics and Covance After the Distributions--Spin- 
Off Tax Indemnification Agreements." 

                                     104
<PAGE> 

           DESCRIPTION OF CERTAIN INDEBTEDNESS OF QUEST DIAGNOSTICS 

Description of Quest Diagnostics Credit Facility 


   In order to pay approximately $350 million of the Intercompany Debt owed 
by Quest Diagnostics in connection with the Quest Diagnostics Spin-Off 
Distribution, and to meet its future capital requirements including the 
funding of operating activities and further acquisitions, Quest Diagnostics 
is negotiating with several banks for a credit agreement (the "Credit 
Agreement") providing for a $450 million credit facility (the "Quest 
Diagnostic Credit Facility"). Morgan Guaranty Trust Company of New York 
("Morgan"), NationsBank, N.A. ("NationsBank") and Wachovia Bank of Georgia, 
N.A. ("Wachovia") are arranging the Quest Diagnostics Credit Facility. A copy 
of the proposed form of the Credit Agreement has been filed as an exhibit to 
the Quest Diagnostics Form 10. This summary of the material terms and 
conditions of the Quest Diagnostics Credit Facility and the Credit Agreement 
does not purport to be complete, and is qualified in its entirety by 
references to such proposed form, including the definitions therein. 



   The $450 million commitment under the Quest Diagnostics Credit Facility 
will be comprised of three sub- facilities: (i) a $300 million six-year 
amortizing term loan (the "Tranche A Loan"), (ii) a seven-year $50 million 
term loan with minimal amortization until the seventh year (the "Tranche B 
Loan") and (iii) a $100 million six-year revolving working capital credit 
facility (the "Working Capital Facility"). Under the Working Capital 
Facility, up to $20 million may be used for Letters of Credit to be issued by 
one or more Issuing Banks (initially NationsBank), and up to $10 million may 
be used to borrow from Wachovia, as the Swingline Bank, under a Swingline 
Facility. All Working Capital Banks are required to ratably share the 
exposure of the Issuing Banks under the Letters of Credit and, at the request 
of the Swingline Bank, must purchase ratable participations in the Swingline 
Loans. With the exception of Swingline borrowings and Letters of Credit, 
borrowings under the Working Capital Facility must be at least $10 million 
for LIBOR based borrowings and $5 million for Base Rate based borrowings. 
Under the Swingline Facility, borrowings must be at least $1 million. The 
Quest Diagnostics Credit Facility will be secured by substantially all 
accounts receivable of Quest Diagnostics and by a guaranty from, and a pledge 
of all capital stock and accounts receivable (including intercompany loans) 
of, substantially all of Quest Diagnostics' present and future material U.S. 
Subsidiaries, excluding certain Joint Ventures, Covance and Covance's 
Subsidiaries. The borrowings under the Quest Diagnostics Credit Facility will 
rank senior in priority of repayment to any Permitted Subordinated Debt, 
including the Senior Subordinated Notes and any of Quest Diagnostics' 
remaining debt to Corning. At the time of the Distributions, Quest 
Diagnostics' debt to Corning must be extinguished except to the extent it is 
included in the $150 million of Permitted Subordinated Debt. 



   Interest Rate Calculations. Interest will be payable on each sub-facility 
quarterly, or at the end of the relevant interest period, if earlier, at a 
per annum rate equal to the Base Rate or (except for Swingline Loans) the 
Eurodollar Rate plus the relevant Applicable Margin. The Base Rate is a 
fluctuating rate calculated on a daily basis as the higher of (a) the rate of 
interest publicly announced by Morgan for the day in question and (b) 0.5% 
over the weighted average of the rates, rounded up to the nearest basis 
point, on overnight Federal Funds transactions with members of the Federal 
Reserve System as arranged by Federal Funds brokers on the day in question. 
The Eurodollar Rate is the average of the annual rate at which deposits in 
U.S. dollars are offered to each of the Reference Banks in the London 
interbank market, adjusted for reserve requirements ("Adjusted LIBOR"). The 
initial Applicable Margin payable for Adjusted LIBOR borrowings will be 1.75% 
per annum for the Tranche A Loan and the Working Capital Loan and 2.25% per 
annum for the Tranche B Loan. The initial Applicable Margin payable for Base 
Rate borrowings will be 0.75% per annum for the Tranche A Loan and the 
Working Capital Loan and 1.25% per annum for the Tranche B Loan. After 
December 31, 1996, the Applicable Margin will be determined by a pricing 
formula based on Quest Diagnostics' Debt Coverage Ratio. The Applicable 
Margin range for the Tranche A Loan and the Working Capital Loan may vary, 
depending on the Debt Coverage Ratio, from 0% to 1% for Base Rate Advances, 
and from 0.5% to 2% per annum for Eurodollar Rate Advances. The Swingline 
Loans will accrue interest at a rate equal to the Base Rate plus the relevant 
Applicable Margin for Tranche A and Working Capital Base Rate Loans. The 
Applicable Margin for the Tranche B Loan will remain fixed throughout the 
life of the loan at the initial Applicable Margin levels. Any overdue 
principal or interest payable on any Eurodollar loan will incur interest at 
the greater of Adjusted LIBOR or LIBOR plus the Applicable Margin plus 2% per 
annum. Any overdue principal or interest payable on a Base Rate loan will 
incur interest at the Base Rate plus the Applicable Margin plus 2% per annum. 


   The Credit Agreement also requires the payment of a quarterly Commitment 
Fee on the average daily unused portion of the Banks' aggregate commitments 
under the Working Capital Facility. The initial Commitment Fee Rate 

                                     105
<PAGE> 

will be 0.375% per annum. After December 31, 1996, the Commitment Fee Rate 
will be determined based on Quest Diagnostics' Debt Coverage Ratio, and will 
range from 0.175% to 0.5% per annum. 

   Quest Diagnostics shall also pay the Issuing Banks in proportion to their 
Letter of Credit Exposure a fee of 0.125% per annum on any amounts 
outstanding on undrawn Letters of Credit. Additionally, Quest Diagnostics 
shall pay directly to the Issuing Bank all customary fees connected with the 
issuing of a Letter of Credit. 


   Quest Diagnostics will also pay Morgan a negotiated fee for its services 
as Administrative Agent under the Quest Diagnostics Credit Facility. 



   Covenants and Conditions. The Credit Agreement includes covenants which, 
subject to certain specific exceptions and limitations, require Quest 
Diagnostics and its Subsidiaries to: (i) provide certain financial 
information to the Banks including, Quest Diagnostics' consolidated audited 
financial reports, financial ratio data, annual business plans and 
projections and certification that no defaults have occurred; (ii) pay or 
discharge all material obligations and liabilities; (iii) keep property in 
good working order and maintain sufficient insurance coverage on all 
property; (iv) maintain corporate existence; (v) pursue the same or 
substantially similar lines of business to the ones in which they are 
currently engaged; (vi) comply with all laws, including ERISA and 
environmental regulations; (vii) allow any Bank to inspect accounting 
records; (viii) not permit modification to or waiver of any Transaction 
Documents including any documents connected with the Permitted Subordinated 
Debt or the Permitted Preferred Stock; (ix) not hold or acquire any 
investments other than those allowed by the Credit Agreement; (x) not create 
or allow to be created any liens other than those permitted by the Credit 
Agreement; (xi) refrain from engaging in a consolidation, acquisition, merger 
or sale of assets except as allowed in the Credit Agreement; (xii) not engage 
in any transaction with or for the benefit of any Affiliate other than 
certain arm's-length transactions; (xiii) prevent the existence of any 
agreement that prevents Quest Diagnostics' Subsidiaries from paying dividends 
or other distributions on capital stock; (xiv) refrain from making certain 
Restricted Payments as detailed below; (xv) not incur Debt other than Debt 
allowed under the Credit Agreement; (xvi) maintain certain financial ratios 
as detailed below; and (xvii) not make Consolidated Capital Expenditures in 
excess of $95,000,000 (less the consideration paid for certain acquisitions) 
in any fiscal year. 



     Quest Diagnostics may, subject to certain limitations and exceptions
contained in the Credit Agreement, make certain Restricted Payments so long as
there are no current or continuing Defaults, and the otherwise Restricted
Payment would not cause a Default. Allowed payments include: (i) the repayment
of Permitted Subordinated Debt from the proceeds of any newly issued Senior
Subordinated Notes, (ii) interest and fees on the Senior Subordinated Notes,
(iii) dividends paid on any Permitted Preferred Stock, (iv) repurchases of
shares pursuant to certain employee benefit and compensation plans and (v)
certain payments to Corning required to be made pursuant to the Spin-Off
Transactions. Restricted Payments include: (i) any other dividends or
distributions on any of the shares of capital stock of Quest Diagnostics except
dividends or distributions paid solely in shares of Quest Diagnostics capital
stock, (ii) any other payment on Subordinated Debt and (iii) any payment,
including those to sinking funds, made to redeem, repurchase, acquire or retire
any of the Subordinated Debt or the shares of capital stock, or the rights to
acquire shares, of Quest Diagnostics or its Subsidiaries.



   Quest Diagnostics will be required to maintain: (i) a ratio (the "Leverage 
Ratio") of (A) Consolidated Total Debt to (B) Consolidated Total 
Capitalization equal to or below 0.55 to 1.0 at the outset, decreasing over 
time to 0.45 to 1.0; (ii) a ratio (the "Debt Coverage Ratio") of (A) 
Consolidated Total Debt to (B) Consolidated EBITDA equal to or below between 
3.8 to 1.0 at the outset, decreasing over time to 2.0 to 1.0; and (iii) a 
ratio (the "Coverage Ratio") of (A) the sum of (1) Consolidated EBITDA and 
(2) Consolidated Rental Expense to (B) the sum of (1) Consolidated Interest 
Expense and (2) Consolidated Rental Expense equal to or above 1.8 to 1.0 at 
the outset, decreasing over time to 3.0 to 1.0. Quest Diagnostics is required 
to have a Leverage Ratio no greater than 0.55 to 1.0 through December 31, 
1997, a Debt Coverage Ratio of less than 3.8 to 1.0 through June 30, 1997 and 
a Coverage Ratio of at least 1.8 to 1.0 from January 1, 1997 through June 30, 
1997. After giving pro forma effect to the Distributions, $350 million of 
borrowings under the Credit Facility and to the Permitted Subordinated Debt, 
Quest Diagnostics would have had a Leverage Ratio of 0.47 to 1.0 at September 
30, 1996, a Debt Coverage Ratio of 3.2 to 1.0 for the quarter ended September 
30, 1996 and a Coverage Ratio of 2.2 to 1.0 for the quarter ended September 
30, 1996. 



   Events of Default. Events of Default include: (i) the failure to make 
payment under the Credit Agreement of any principal when due or any interest, 
fees or other amounts within three business days after becoming due; (ii)  



                                     106
<PAGE> 

any representation, warranty, certification or statement made by Quest
Diagnostics proving to have been incorrect in any material respect when made;
(iii) the failure by Quest Diagnostics or its Subsidiaries to perform or observe
any term, covenant or agreement under the Credit Agreement (subject to certain
cure periods); (iv) the failure of Quest Diagnostics to make payment on any
Material Financial Obligation (totalling in aggregate more than $10 million)
within the applicable grace period; (v) the occurrence of an event that causes
the acceleration of, or enables another of Quest Diagnostics' creditors to
accelerate, any of Quest Diagnostics' other Material Debt (totalling in
aggregate more than $10 million); (vi) the commencement of a voluntary or
involuntary bankruptcy proceeding by or against Quest Diagnostics; (vii) the
failure to pay when due ERISA obligations in excess of $10 million; (viii) the
rendering of a judgment or judgments against Quest Diagnostics the aggregate
amounts of which are in excess of $10 million and remain unsatisfied or unstayed
for more than 30 days, or the placing by a judgment creditor of a levy on the
assets of Quest Diagnostics or its Subsidiaries; (ix) at any time after the
Spin-Off, a person or group obtains beneficial ownership of 20% or more of the
common stock of Quest Diagnostics, or, during any period of 12 calendar months,
the individuals who constituted the members of the board of directors of Quest
Diagnostics on the first day of that period no longer constitute a majority of
the board; or (x) any security interest that was purported to be created by the
related security documents ceases to exist or be valid.

   If an Event of Default occurs and continues beyond the allowed time period 
for curing the default in question, the Banks, by a vote of more than 50% of 
the aggregate Commitments, may terminate their Commitments to lend to Quest 
Diagnostics. The Banks may further choose, by a separate vote representing 
more than 50% of the aggregate principal amount of all of the Loans, to 
accelerate the outstanding principal and interest. Additionally, during an 
Event of Default the Letter of Credit Participants, by a more than 50% vote 
of the amount of the total outstanding of the Letter of Credit Exposure, may 
require that Quest Diagnostics fully cash collateralize the outstanding 
Letter of Credit Exposure. In the case of a voluntary or involuntary 
bankruptcy proceeding, all credit facilities shall terminate and all 
outstanding amounts shall become immediately due and payable without any 
action by the Banks. 

Description of Notes 

   Prior to the Distributions, Quest Diagnostics will offer (the "Quest 
Diagnostics Notes Offering") $150 million aggregate principal amount of 
senior subordinated notes (the "Notes"). 

   General. The Notes will be senior subordinated obligations of Quest 
Diagnostics, and will be guaranteed on a senior subordinated basis by Quest 
Diagnostics' present and future Restricted Subsidiaries (as defined) on a 
joint and several basis. The guarantees will automatically terminate if the 
related guarantees of the Quest Diagnostics Credit Facility are terminated. 

   Stated Maturity and Interest. The Notes will mature on December 15, 2006. 
Interest on the Notes will be payable semiannually on June 15 and December 15 
of each year, commencing June 15, 1997. 

   Redemption. The Notes will not be redeemable, at the option of Quest 
Diagnostics, prior to December 15, 2001. On or after such date, the Notes 
will be redeemable, in whole or in part, at specified redemption prices. 

   Quest Diagnostics will also be entitled to redeem the Notes, as a whole 
and not in part, in the event that the Distributions do not occur as a result 
of an event outside of the control of Quest Diagnostics, Corning and Covance. 

   Quest Diagnostics will be required to offer to purchase the Notes upon a 
Change of Control (as defined) and in the event of certain asset sales. 

   Certain Covenants. The Indenture will impose certain limitations on the 
ability of Quest Diagnostics and its subsidiaries to, among other things, 
incur additional indebtedness, pay dividends or make certain other restricted 
payments, consummate certain asset sales, enter into certain transactions 
with affiliates, incur indebtedness that is subordinate in right of payment 
to any Senior Debt (as defined) and senior in right of payment to the Notes, 
incur liens, enter into leases and sale and leaseback transactions, merge or 
consolidate with any other person or sell, assign, transfer, lease, convey or 
otherwise dispose of all or substantially all of the assets of the Company. 
In particular, the Indenture will limit Quest Diagnostics' ability to pay 
cash dividends on the Quest Diagnostics Common Stock based on 50% of Quest 
Diagnostics' net income, plus a credit for issuances of capital stock. 

                                     107
<PAGE> 

                       LIABILITY AND INDEMNIFICATION OF 
                 DIRECTORS AND OFFICERS OF QUEST DIAGNOSTICS 

Limitation on Liability of Directors 

   Pursuant to authority conferred by Section 102 of the DGCL, Paragraph 11 
of the Quest Diagnostics Certificate ("Paragraph 11") eliminates the personal 
liability of Quest Diagnostics' directors to Quest Diagnostics or its 
stockholders for monetary damages for breach of fiduciary duty, including 
without limitation, directors serving on committees of the Quest Diagnostics 
Board. Directors remain liable for (1) any breach of the duty of loyalty to 
Quest Diagnostics or its stockholders, (2) any act or omission not in good 
faith or which involves intentional misconduct or a knowing violation of law, 
(3) any violation of Section 174 of the DGCL, which proscribes the payment of 
dividends and stock purchases or redemptions under certain circumstances, and 
(4) any transaction from which directors derive an improper personal benefit. 

Indemnification and Insurance 

   In accordance with Section 145 of the DGCL, which provides for the 
indemnification of directors, officers and employees under certain 
circumstances, Paragraph 11 grants Quest Diagnostics' directors and officers 
a right to indemnification for all expenses, liabilities and losses relating 
to civil, criminal, administrative or investigative proceedings to which they 
are a party (1) by reason of the fact that they are or were directors or 
officers of Quest Diagnostics or (2) by reason of the fact that, while they 
are or were directors or officers of Quest Diagnostics, they are or were 
serving at the request of Quest Diagnostics as directors or officers of 
another corporation, partnership, joint venture, trust or enterprise. 
Paragraph 11 further provides for the mandatory advancement of expenses 
incurred by officers and directors in defending such proceedings in advance 
of their final disposition upon delivery to Quest Diagnostics by the 
indemnitee of an undertaking to repay all amounts so advanced if it is 
ultimately determined that such indemnitee is not entitled to be indemnified 
under Paragraph 11. Quest Diagnostics may not indemnify or make advance 
payments to any person in connection with proceedings initiated against Quest 
Diagnostics by such person without the authorization of the Quest Diagnostics 
Board. 

   In addition, Paragraph 11 provides that directors and officers therein 
described shall be indemnified to the fullest extent permitted by Section 145 
of DGCL, or any successor provisions or amendments thereunder. In the event 
that any such successor provisions or amendments provide indemnification 
rights broader than permitted prior thereto, Paragraph 11 allows such broader 
indemnification rights to apply retroactively with respect to any predating 
alleged action or inaction and also allows the indemnification to continue 
after an indemnitee has ceased to be a director or officer of Quest 
Diagnostics and to inure to the benefit of the indemnitee's heirs, executors 
and administrators. 

   Paragraph 11 further provides that the right to indemnification is not 
exclusive of any other right which any indemnitee may have or thereafter 
acquire under any statute, the Quest Diagnostics Certificate, any agreement 
or vote of stockholders or disinterested directors or otherwise, and allows 
Quest Diagnostics to indemnify and advance expenses to any person whom the 
corporation has the power to indemnify under the DGCL or otherwise. 

   Insofar as indemnification for liabilities arising under the Securities 
Act may be permitted for directors and officers and controlling persons 
pursuant to the foregoing provisions, Quest Diagnostics has been advised that 
in the opinion of the Commission such indemnification is against public 
policy as expressed in the Securities Act and is, therefore, unenforceable. 

   The Quest Diagnostics Certificate authorizes Quest Diagnostics to purchase 
insurance for directors and officers of Quest Diagnostics and persons who 
serve at the request of Quest Diagnostics as directors, officers, employees 
or agents of another corporation, partnership, joint venture, trust or 
enterprise, against any expense, liability or loss incurred in such capacity, 
whether or not Quest Diagnostics would have the power to indemnify such 
persons against such expense or liability under the DGCL. Quest Diagnostics 
intends to maintain insurance coverage of its officers and directors as well 
as insurance coverage to reimburse Quest Diagnostics for potential costs of 
its corporate indemnification of directors and officers. 

                                     108

<PAGE>

                        INDEX TO FINANCIAL STATEMENTS 

<TABLE>
<CAPTION>
                                                                                                           Page 
                                                                                                         --------- 
<S>                                                                                                      <C>
FINANCIAL STATEMENTS OF CORNING CLINICAL LABORATORIES INC. 
  (to be renamed Quest Diagnostics Incorporated) 
Report of Price Waterhouse LLP--Independent Accountants                                                     F-2 
Report of Deloitte and Touch LLP--Independent Auditors                                                      F-3 
Report of Ernst & Young LLP--Independent Auditors                                                           F-4 
Report of Leverone and Company--Independent Accountants                                                     F-5 
Combined Financial Statements: 
 Combined Balance Sheets--December 31, 1995 and 1994                                                        F-6 
 Combined Statements of Operations--Years ended December 31, 1995, 1994 and 1993                            F-7 
 Combined Statements of Cash Flows--Years ended December 31, 1995, 1994 and 1993                            F-8 
 Combined Statements of Stockholder's Equity--Years ended December 31, 1995, 1994 and 1993                  F-9 
 Notes to Combined Financial Statements                                                                    F-10 
 Financial Statement Schedule II--Valuation Accounts and Reserves                                          F-23 
 Quarterly Operating Results (unaudited)                                                                   F-24 
Interim Combined Financial Statements (unaudited): 
 Combined Balance Sheets--September 30, 1996 and December 31, 1995                                         F-25 
 Combined Statements of Operations--Three and Nine Months ended September 30, 1996 
   and 1995                                                                                                F-26 
 Combined Statements of Cash Flows--Nine Months ended September 30, 1996 and 1995                          F-27 
 Notes to Interim Combined Financial Statements                                                            F-28 
</TABLE>

                                     F-1 
<PAGE> 

                        REPORT OF INDEPENDENT ACCOUNTANTS 

To the Boards of Directors and Stockholders of 
Corning Incorporated and Corning Clinical Laboratories Inc. 


   In our opinion, based upon our audits and the reports of other auditors, 
the accompanying combined balance sheets and the related combined statements 
of operations and of cash flows and of stockholder's equity appearing on 
pages F-6 through F-23 present fairly, in all material respects, the 
financial position of Corning Clinical Laboratories Inc. (to be renamed Quest 
Diagnostics Incorporated) and the combined companies as discussed in Note 1 
(collectively, the "Company"), a wholly-owned business of Corning 
Incorporated, at December 31, 1995 and 1994, and the results of their 
operations and their cash flows for each of the three years in the period 
ended December 31, 1995, in conformity with generally accepted accounting 
principles. These financial statements are the responsibility of the 
Company's management; our responsibility is to express an opinion on these 
financial statements based on our audits. We did not audit the 1993 financial 
statements of Maryland Medical Laboratory, Inc., Nichols Institute and Bioran 
Medical Laboratory, which were acquired by the Company in 1994 in separate 
transactions accounted for as poolings of interests and which collectively 
reflect total revenues of $438 million for the year ended December 31, 1993. 
Those statements were audited by other auditors whose reports thereon have 
been furnished to us, and our opinion expressed herein, insofar as it relates 
to the amounts included for Maryland Medical Laboratory, Inc., Nichols 
Institute and Bioran Medical Laboratory, is based solely on the reports of 
the other auditors. We conducted our audits of these statements in accordance 
with generally accepted auditing standards which require that we plan and 
perform the audit to obtain reasonable assurance about whether the financial 
statements are free of material misstatement. An audit includes examining, on 
a test basis, evidence supporting the amounts and disclosures in the 
financial statements, assessing the accounting principles used and 
significant estimates made by management, and evaluating the overall 
financial statement presentation. We believe that our audits and the reports 
of other auditors provide a reasonable basis for the opinion expressed above. 


   As discussed in Note 2 to the combined financial statements, in 1993 the 
Company adopted Statement of Financial Accounting Standards No. 109, 
"Accounting for Income Taxes." 

/s/ Price Waterhouse LLP 

Price Waterhouse LLP 
New York, New York 
September 20, 1996, except for Note 13 
as to which the date is November 4, 1996 

                                     F-2 
<PAGE> 

                        REPORT OF INDEPENDENT AUDITORS 

To the Board of Directors and Stockholders of 
Nichols Institute: 

   We have audited the consolidated statements of operations, stockholders' 
equity and cash flows for the year ended December 31, 1993 of Nichols 
Institute and its subsidiaries (the Company) (not presented separately 
herein). These consolidated financial statements are the responsibility of 
the Company's management. Our responsibility is to express an opinion on 
these financial statements based on our audit. 

   We conducted our audit in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audit provides a 
reasonable basis for our opinion. 

   In our opinion, such consolidated financial statements present fairly, in 
all material respects, the results of operations and cash flows of Nichols 
Institute and its subsidiaries for the year ended December 31, 1993, in 
conformity with generally accepted accounting principles. 

   As discussed in Note 11 to the consolidated financial statements, the 
Company has received a subpoena from the Office of the Inspector General of 
the Department of Health and Human Services (OIG) requesting documents in 
connection with an investigation and internal review concerning the possible 
submission of false or improper claims to the Medicare and Medicaid programs. 
No claim or charges have been made against the Company relating to this 
investigation. The ultimate outcome of this investigation cannot presently be 
determined. Accordingly, no provision for any loss that may result from this 
investigation has been made in the accompanying consolidated financial 
statements. 

   As discussed in Notes 1 and 3 to the consolidated financial statements, at 
December 31, 1993, the Company was not in compliance with certain covenants 
of its senior note agreements and the senior lenders have not waived those 
covenants. The senior note agreements provide that, as a result of failure to 
comply with the covenants, the note holders have the right to declare the 
entire unpaid balance immediately due and payable, and if that were to occur, 
the Company would not have the funds required to retire the debt unless 
alternative financing is obtained. Management's plans in regard to these 
matters are described in Notes 1 and 3. The note holders' right to declare 
the entire unpaid balance under the note agreements immediately due and 
payable raises substantial doubt about the Company's ability to continue as a 
going concern. The accompanying consolidated financial statements have been 
prepared assuming that the Company will continue as a going concern. The 
financial statements do not include any adjustments that might result from 
the outcome of this uncertainty, except for the classification of amounts due 
under the senior note agreements as current. 

/s/ Deloitte & Touche LLP 

Deloitte & Touche LLP 
Costa Mesa, California 
February 28, 1994 

                                     F-3 
<PAGE> 

                        REPORT OF INDEPENDENT AUDITORS 

Board of Directors 
Maryland Medical Laboratory, Inc. 

   We have audited the combined balance sheet of Maryland Medical Laboratory, 
Inc. and affiliates as of March 31, 1994, and the related combined statements 
of income, changes in equity and cash flows for the year then ended (not 
presented separately herein). These financial statements are the 
responsibility of the Company's management. Our responsibility is to express 
an opinion on these financial statements based on our audit. 

   We conducted our audit in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audit provides a 
reasonable basis for our opinion. 

   In our opinion, the financial statements referred to above present fairly, 
in all material respects, the combined financial position of Maryland Medical 
Laboratory, Inc. and affiliates at March 31, 1994, and the combined results 
of their operations and their cash flows for the year then ended in 
conformity with generally accepted accounting principles. 

/s/ Ernst & Young LLP 

Ernst & Young LLP 
Baltimore, Maryland 
May 19, 1994 

                                     F-4 
<PAGE> 

                      REPORT OF INDEPENDENT ACCOUNTANTS 

To the Board of Directors 
Moran Research Labs 
415 Massachusetts Avenue 
Cambridge, MA  02139 

   We have audited the accompanying balance sheet of Moran Research Labs 
(d/b/a Bioran Medical Laboratory, a Massachusetts Business Trust) as of 
December 31, 1993, and the related statements of income, retained earnings, 
and cash flows for the year then ended. These financial statements are the 
responsibility of the Company's management. Our responsibility is to express 
an opinion on these financial statements based on our audit. 

   We conducted our audit in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit includes assessing the accounting principles used and significant 
estimates made by management, as well as evaluating the overall financial 
statement presentation. We believe that our audit provides a reasonable basis 
for our opinion. 

   In our opinion, the financial statements referred to above present fairly, 
in all material respects, the financial position of Moran Research Labs 
(d/b/a Bioran Medical Laboratory, a Massachusetts Business Trust) at December 
31, 1993 and the results of its operations and its cash flows for the year 
then ended in conformity with generally accepted accounting principles. 

/s/ Leverone & Company 

Leverone & Company 
Billerica, Massachusetts 
November 10, 1994 

                                     F-5 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                           COMBINED BALANCE SHEETS 
                          DECEMBER 31, 1995 AND 1994 
                                (in thousands) 

<TABLE>
<CAPTION>
                                                                               1995          1994 
                                                                            -----------   ------------ 
<S>                                                                         <C>           <C>
ASSETS 
- ------- 
Current Assets: 
   Cash and cash equivalents                                                $   36,446    $   38,719 
Accounts receivable, net of allowance of $147,947 and 
   $74,829 for 1995 and 1994, respectively                                     318,252       360,410 
Inventories                                                                     26,601        28,248 
Deferred taxes on income                                                        98,845        53,696 
Prepaid expenses and other assets                                               22,014        19,241 
                                                                              ---------     ---------- 
 Total current assets                                                          502,158       500,314 
Property, plant and equipment, net                                             296,116       287,562 
Intangible assets, net                                                       1,030,633     1,053,194 
Deferred taxes on income                                                         6,062        19,593 
Other assets                                                                    18,416        22,000 
                                                                            -----------   ------------ 
TOTAL ASSETS                                                                $1,853,385    $1,882,663 
                                                                            ===========   ============ 
LIABILITIES AND STOCKHOLDER'S EQUITY 
- ---------------------------------- 
Current Liabilities: 
  Accounts payable and accrued expenses                                     $  240,525    $  236,887 
Current portion of long-term debt                                               12,148        12,572 
Income taxes payable                                                            39,766        30,454 
Due to Corning Incorporated and affiliates                                       8,979         6,043 
                                                                              ---------     ---------- 
 Total current liabilities                                                     301,418       285,956 
Long-term debt (principally due to Corning Incorporated)                     1,195,566     1,153,054 
Other liabilities                                                               60,600        56,841 
                                                                              ---------     ---------- 
Total liabilities                                                            1,557,584     1,495,851 
                                                                              ---------     ---------- 
Commitments and Contingencies 
Stockholder's Equity: 
 Contributed capital                                                           297,823       297,823 
Retained earnings (accumulated deficit)                                         (3,118)       85,893 
Cumulative translation adjustment                                                2,325         3,096 
Market valuation adjustment                                                     (1,229)           -- 
                                                                              ---------     ---------- 
 Total stockholder's equity                                                    295,801       386,812 
                                                                              ---------     ---------- 
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY                                  $1,853,385    $1,882,663 
                                                                              =========     ========== 
</TABLE>

The accompanying notes are an integral part of these statements. 

                                     F-6 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                      COMBINED STATEMENTS OF OPERATIONS 
             FOR THE YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993 
                                (in thousands) 

<TABLE>
<CAPTION>
                                                                1995          1994           1993 
                                                             -----------   -----------   ------------ 
<S>                                                          <C>           <C>           <C>
Net revenues                                                 $1,629,388    $1,633,699     $1,416,338 
Costs and expenses: 
 Cost of services                                               980,232       969,844        805,729 
 Selling, general and administrative                            523,271       411,939        363,579 
 Provision for restructuring and other special charges           50,560        79,814         99,600 
 Interest expense, net                                           82,016        63,295         41,898 
 Amortization of intangible assets                               44,656        42,588         28,421 
 Other, net                                                       6,221         3,464          6,423 
                                                              ----------    ----------    ----------- 
  Total                                                       1,686,956     1,570,944      1,345,650 
                                                              ----------    ----------    ----------- 
Income (loss) before taxes                                      (57,568)       62,755         70,688 
Income tax expense (benefit)                                     (5,516)       34,410         25,929 
                                                              ----------    ----------    ----------- 
Income (loss) before cumulative effect of change in 
  accounting principle                                          (52,052)       28,345         44,759 
Cumulative effect of change in accounting principle                  --            --        (10,562) 
                                                              ----------    ----------    ----------- 
Net income (loss)                                            $  (52,052)   $   28,345     $   34,197 
                                                              ==========    ==========    =========== 
</TABLE>

The accompanying notes are an integral part of these statements. 

                                     F-7 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                      COMBINED STATEMENTS OF CASH FLOWS 
             FOR THE YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993 
                                (in thousands) 

<TABLE>
<CAPTION>
                                                                         1995         1994          1993 
                                                                      -----------   ----------   ----------- 
<S>                                                                   <C>           <C>          <C>
Cash flows from operating activities: 
Net income (loss)                                                     $  (52,052)   $  28,345    $  34,197 
Adjustments to reconcile net income (loss) to net 
cash provided by operating activities: 
 Depreciation and amortization                                          101,513        89,517       66,479 
 Provision for doubtful accounts                                        152,590        59,480       47,240 
 Provision for restructuring and other special charges                   50,560        79,814       99,600 
 Deferred income tax provision                                          (32,384)       (4,742)     (23,841) 
 Cumulative effect of change in accounting principle                         --            --       10,562 
 Other, net                                                               8,303        14,600        1,765 
 Changes in operating assets and liabilities: 
  Accounts receivable                                                  (109,500)     (103,402)     (61,828) 
  Accounts payable and accrued expenses                                  14,604       (32,756)     (33,903) 
  Restructuring, integration and other special charges                  (57,768)      (88,093)     (46,917) 
  Due from/to Corning Incorporated and affiliates                         2,934        14,783       (2,581) 
  Other assets and liabilities, net                                       7,028       (19,583)       8,841 
                                                                      ----------     --------    ---------- 
Net cash provided by operating activities                                85,828        37,963       99,614 
                                                                      ----------     --------    ---------- 
Cash flows from investing activities: 
 Capital expenditures                                                   (74,045)      (93,354)     (65,317) 
 Proceeds from disposition of assets                                      2,880        55,762           -- 
 Acquisition of businesses, net of cash acquired                        (22,907)      (12,154)    (401,428) 
 Decrease (increase) in investments                                         985         3,560       (6,942) 
                                                                      ----------     --------    ---------- 
Net cash used in investing activities                                   (93,087)      (46,186)    (473,687) 
                                                                      ----------     --------    ---------- 
Cash flows from financing activities: 
 Proceeds from borrowings, primarily with Corning Incorporated           55,729       186,046      709,630 
 Repayment of long-term debt                                            (13,784)     (118,046)    (265,196) 
 Dividends paid                                                         (36,959)      (60,468)     (51,478) 
                                                                      ----------     --------    ---------- 
Net cash provided by financing activities                                 4,986         7,532      392,956 
                                                                      ----------     --------    ---------- 
Net change in cash and cash equivalents                                  (2,273)         (691)      18,883 
Cash and cash equivalents, beginning of year                             38,719        39,410       20,527 
                                                                      ----------     --------    ---------- 
Cash and cash equivalents, end of year                                $  36,446     $  38,719    $  39,410 
                                                                      ==========     ========    ========== 
</TABLE>

The accompanying notes are an integral part of these statements. 

                                     F-8 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                 COMBINED STATEMENTS OF STOCKHOLDER'S EQUITY 
             FOR THE YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993 
                                (in thousands) 

<TABLE>
<CAPTION>
                                                                               Cumulative      Market          Total 
                                                                   Retained    Translation    Valuation    Stockholder's 
                                            Contributed Capital    Earnings    Adjustment    Adjustment        Equity 
                                             ------------------- -----------  ------------  ------------  --------------- 
<S>                                         <C>                  <C>          <C>           <C>           <C>
Balance, December 31, 1992                        $ 261,499        $146,938     $   (288)     $              $ 408,149 
Net income                                                           34,197                                     34,197 
Dividends to CLSI                                                   (28,088)                                   (28,088) 
Dividends to S-Corporation shareholders                             (23,390)                                   (23,390) 
Equity of pooled entity                              4,150           (4,096)                                        54 
Translation adjustment                                                             4,587                         4,587 
                                             ------------------     ---------    ----------    ----------    ------------- 
Balance, December 31, 1993                         265,649          125,561        4,299                       395,509 
Net income                                                           28,345                                     28,345 
Dividends to CLSI                                                   (33,275)                                   (33,275) 
Dividends to S-Corporation shareholders                             (27,193)                                   (27,193) 
Dividends in-kind to S-Corporation 
  shareholders                                                       (7,545)                                    (7,545) 
Capital contribution                                32,174                                                      32,174 
Translation adjustment                                                            (1,203)                       (1,203) 
                                             ------------------     ---------    ----------    ----------    ------------- 
Balance, December 31, 1994                         297,823           85,893        3,096                       386,812 
Net loss                                                            (52,052)                                   (52,052) 
Dividends to CLSI                                                   (36,959)                                   (36,959) 
Translation adjustment                                                              (771)                         (771) 
Market valuation adjustment                                                                     (1,229)         (1,229) 
                                             ------------------     ---------    ----------    ----------    ------------- 
Balance, December 31, 1995                        $ 297,823        $ (3,118)     $ 2,325       $(1,229)       $ 295,801 
                                             ==================     =========    ==========    ==========    ============= 
</TABLE>

The accompanying notes are an integral part of these statements. 

                                     F-9 
<PAGE> 

                       CORNING CLINICAL LABORATORIES INC.
                 (to be renamed Quest Diagnostics Incorporated)
                (a wholly-owned business of Corning Incorporated)
                     NOTES TO COMBINED FINANCIAL STATEMENTS
               (dollars in thousands, unless otherwise indicated)

1. BASIS OF PRESENTATION 

   Corning Clinical Laboratories Inc. and Corning Nichols Institute Inc. 
(collectively referred to as "CCL" or the "Company") are wholly-owned 
subsidiaries of Corning Life Sciences Inc. ("CLSI") which in turn is a 
wholly-owned subsidiary of Corning Incorporated ("Corning"). The Company is 
one of the largest clinical laboratory testing businesses in the United 
States. The accompanying financial statements present the carved-out results 
of operations, cash flows and financial position of Corning's clinical 
laboratory testing business. Covance Inc. (formerly Corning Pharmaceutical 
Services Inc.), a subsidiary of CCL, and its related entities ("Covance") as 
well as environmental testing services formerly provided by CCL are excluded. 
In 1994, Corning acquired three clinical laboratory testing businesses on the 
behalf of CCL in separate transactions accounted for as poolings of interests 
(see Note 3). Results presented for 1994 and 1993 include the results of CCL 
and the pooled entities on a combined basis. 

   In May 1996, Corning's Board of Directors approved a plan to distribute to 
its shareholders on a pro rata basis all of the shares of CCL and Covance 
(the "CCL and Covance Spin-Off Distributions"). The result of the plan will 
be the creation of two independent, publicly-owned companies. As a result of 
the Spin-Off Distributions, CCL will operate Corning's clinical laboratory 
testing business as an independent public company and Covance will own and 
operate Corning's contract research business as an independent public 
company. The Spin-Off Distributions will be effected by the distribution of a 
dividend to holders of Corning Common Stock of all of the outstanding CCL 
Common Stock, followed immediately by the distribution of a dividend to the 
holders of CCL Common Stock of all of the Covance Common Stock. Corning has 
submitted to the Internal Revenue Service a request for a ruling that the 
Spin-Off Distributions qualify as tax-free distributions under the Internal 
Revenue Code of 1986. Coincident with the Spin-Off Distribution, the Company 
will be renamed Quest Diagnostics Incorporated. 

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 

   Principles of Consolidation 

   The combined financial statements include the accounts of all laboratory 
entities controlled by the Company. The equity method of accounting is used 
for investments in affiliates which are not Company controlled and in which 
the Company's interest is generally between 20 and 50 percent. All 
significant intercompany accounts and transactions are eliminated. 

   The preparation of financial statements in conformity with generally 
accepted accounting principles requires management to make estimates and 
assumptions that affect the reported amounts of assets and liabilities and 
disclosure of contingent assets and liabilities at the date of the financial 
statements and the reported amounts of revenues and expenses during the 
reporting period. Actual results could differ from those estimates. 

   Revenue Recognition 

   The Company generally recognizes revenue as services are rendered upon 
completion of the testing process. Billings for services under third-party 
payor programs, including Medicare and Medicaid, are recorded as revenues net 
of allowances for differences between amounts billed and the estimated 
receipts under such programs. Adjustments to the estimated receipts, based on 
final settlement with the third-party payors, are recorded upon settlement. 
In 1995, 1994 and 1993, approximately 23%, 28% and 25%, respectively, of net 
revenues were generated by Medicare and Medicaid programs. 

   Concentrations of Credit Risk 

   Concentrations of credit risk with respect to accounts receivable are 
limited due to the diversity of the Company's clients as well as their 
dispersion across many different geographic regions. 

   Taxes on Income 

   The Company uses the asset and liability approach to account for income 
taxes. Under this method, deferred tax assets and liabilities are recognized 
for the expected future tax consequences of differences between the carrying 
amounts of assets and liabilities and their respective tax bases using 
enacted tax rates in effect for the year in which 

                                     F-10 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

the differences are expected to reverse. The effect on deferred tax assets 
and liabilities of a change in tax rates is recognized in income in the 
period when the change is enacted. In 1993 the Company adopted Statement of 
Financial Accounting Standards No. 109, "Accounting for Income Taxes" (SFAS 
109). The adoption of SFAS 109 resulted in a charge to net income of $10.6 
million, principally representing a reduction in the Company's deferred tax 
assets to reflect the then enacted statutory tax rate. 

   Cash and Cash Equivalents 

   Cash and cash equivalents include all highly-liquid investments with 
original maturities at the time acquired by the Company of three months or 
less, and consist principally of amounts temporarily invested in a U.S. 
government money market fund. 

   Inventories 

   Inventories, which consist principally of supplies, are valued at the 
lower of cost (first in, first out method) or market. 

   Property, Plant and Equipment 

   Property, plant and equipment are recorded at cost. Depreciation and 
amortization are provided on the straight- line method at rates adequate to 
allocate the cost of the applicable assets over their expected useful lives, 
which range from three to forty years. 

   Intangible Assets 

   Acquisition costs in excess of the fair value of net tangible assets 
acquired are capitalized and amortized over appropriate periods not exceeding 
forty years. Other intangible assets are recorded at cost and amortized over 
periods not exceeding fifteen years. 

   Investments 

   The Company accounts for investments in equity securities, which are 
included in other assets, in conformity with Statement of Financial 
Accounting Standards No. 115 (SFAS 115), "Accounting for Certain Investments 
in Debt and Equity Securities." SFAS 115 requires the use of fair value 
accounting for trading or available-for-sale securities. Unrealized losses 
for available-for-sale securities are recorded as a separate component within 
stockholder's equity. Investments in equity securities are not material to 
the Company. 

   Impairment Accounting 

   The Company adopted Statement of Financial Accounting Standards No. 121, 
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets 
to Be Disposed Of" (SFAS 121) in 1995. The Company reviews the recoverability 
of its long-lived assets, including related goodwill and intangible assets, 
when events or changes in circumstances occur that indicate that the carrying 
value of the asset may not be recoverable. Evaluation of possible impairment 
is based on the Company's ability to recover the asset from the expected 
future pre-tax cash flows (undiscounted and without interest charges) of the 
related operations. If the expected undiscounted pre-tax cash flows are less 
than the carrying value of such asset, an impairment loss is recognized for 
the difference between estimated fair value and carrying value. This 
assessment of impairment requires management to make estimates of expected 
future cash flows. It is at least reasonably possible that future events or 
circumstances could cause these estimates to change. 

   In addition, the carrying value of intangible assets has historically been 
subject to a separate evaluation based on estimating expected future 
undiscounted cash flows from operating activities. If these estimated cash 
flows are less than the carrying amount of the intangible assets, the Company 
would recognize an impairment loss in an amount necessary to write down the 
intangible assets to fair value. 

   Earnings Per Share 

   Earnings per share are computed by dividing net income by the weighted 
average number of common shares outstanding. Historical earnings per share 
data is not meaningful as the Company's historical capital structure is not 
comparable to periods subsequent to the CCL Spin-Off Distribution. 

                                     F-11 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

3. BUSINESS COMBINATIONS AND DIVESTITURES 

   Acquisitions 

   During 1995, the Company acquired several laboratories in separate 
transactions accounted for under the purchase method. The total cost of the 
acquired businesses aggregated approximately $23 million and was financed 
through borrowings from Corning. Intangible assets of approximately $21.6 
million resulted from the transactions and are being amortized over periods 
not to exceed forty years. 

   During 1994, Corning acquired three clinical laboratory testing companies 
on behalf of the Company in separate transactions accounted for as poolings 
of interests. In June 1994, Corning acquired the stock of Maryland Medical 
Laboratory, Inc. ("MML") in exchange for approximately 4.5 million shares of 
Corning common stock; in August 1994, Corning acquired the stock of Nichols 
Institute ("Nichols") in exchange for approximately 7.5 million shares of 
Corning common stock and reserved an additional 1.1 million shares for future 
issuance upon the exercise of stock options; and, in October 1994, Corning 
acquired the stock of Bioran Medical Laboratory ("Bioran") in exchange for 
approximately 6.0 million shares of Corning common stock. Results presented 
for 1994 and 1993 include the results of the Company, MML, Nichols and Bioran 
on a combined basis. 

   In 1994, the Company also acquired several other laboratories in separate 
transactions accounted for under the purchase method. The total cost of the 
acquired businesses aggregated approximately $26 million and was financed 
through the issuance of Corning stock and borrowings from Corning. Intangible 
assets of approximately $24 million resulted from these transactions and are 
being amortized over periods not to exceed forty years. 

   In the third quarter of 1993, Corning acquired on behalf of the Company 
the outstanding shares of common stock of Damon Corporation ("Damon"), a 
clinical-testing business, for $405 million, including acquisition costs, 
financed through borrowings from Corning. In addition, approximately $167 
million of Damon's indebtedness was refinanced. Goodwill of approximately 
$600 million resulted from the transaction and is being amortized over forty 
years. Reserves aggregating $79 million were established for the costs of 
closing Damon facilities as a result of the integration of Damon operations. 

   In the fourth quarter of 1993, the Company acquired the clinical-testing 
laboratories of Unilab Corporation ("Unilab") in Denver, Dallas and Phoenix 
in exchange for its ownership interest in Unilab operations, the assumption 
of approximately $70 million of Unilab debt, and the Company's investment in 
J.S. Pathology PLC. Goodwill of approximately $200 million resulted from this 
transaction and is being amortized over forty years. As a result of this 
transaction, the Company received a small equity investment in Unilab. The 
Company previously owned 43% of Unilab. 

   The operations of the businesses, subsequent to the dates they were 
acquired, are included in the combined financial statements. The pro forma 
effect of the 1995 acquisitions on periods prior to the acquisitions is not 
material. 

   In 1993, Corning also acquired and contributed to the Company DeYor 
Laboratory, Inc., in a transaction accounted for as a pooling of interests, 
by issuing 840,000 shares of Corning common stock. The Company's combined 
financial statements for periods prior to this acquisition have not been 
restated, since this acquisition was not material to the Company's financial 
position or the results of its operations for such periods. 

   Divestitures 

   In the second quarter of 1994, the Company sold the California clinical 
laboratory testing operations acquired in the Damon transaction to Physicians 
Clinical Laboratory, Inc. for cash proceeds of $51 million. 

4. TAXES ON INCOME 

   The Company is included in the consolidated Federal income tax return 
filed by Corning. CLSI and its subsidiaries, including the Company, have a 
tax sharing agreement with Corning, pursuant to which they are required to 
compute their provision for income taxes on a separate return basis and pay 
to Corning the separate Federal income tax return liability so computed. 

                                     F-12 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

   The components of the provision (benefit) for income taxes for 1995, 1994 
and 1993 are as follows: 

<TABLE>
<CAPTION>
                                      1995        1994       1993 
                                    ---------   --------   ---------- 
<S>                                 <C>         <C>        <C>
Current: 
 Federal                            $  22,786   $31,598    $ 46,215 
 State and local                        3,556     7,019       2,815 
 Foreign                                  526       535         740 
Deferred (benefit): 
 Federal                              (28,109)   (1,339)    (23,818) 
 State and local                       (4,275)   (3,403)        (23) 
                                      -------     ------    --------- 
  Income tax expense (benefit)      $  (5,516)  $34,410    $ 25,929 
                                      =======     ======    ========= 
</TABLE>

   Prior to acquisition by Corning, Bioran and certain MML operations were 
S-Corporations; accordingly, no federal provision for income taxes has been 
reflected relative to these operations. 

   A reconciliation of the Federal statutory rate to the Company's effective 
tax rate for 1995, 1994 and 1993 is as follows: 

<TABLE>
<CAPTION>
                                                                1995      1994        1993 
                                                              --------   --------   --------- 
<S>                                                           <C>        <C>        <C>
Taxes at statutory rate                                        (35.0%)     35.0%      35.0% 
State and local income taxes, net of federal tax benefit        (0.8%)      3.8%       2.6% 
Income from partnership and S-Corporations not subject to 
  federal and state income tax                                   1.7%     (10.3%)    (11.1%) 
Goodwill                                                        17.6%      14.3%       4.8% 
Non-deductible items                                             6.0%       8.6%       3.4% 
Other, net                                                       0.9%       3.4%       2.0% 
                                                                ------     ------    ------- 
 Effective tax rate                                             (9.6%)     54.8%      36.7% 
                                                                ======     ======    ======= 
</TABLE>

   The tax effects of temporary differences that give rise to significant 
portions of the net deferred tax assets at December 31, 1995 and 1994 are as 
follows: 

<TABLE>
<CAPTION>
                                                   1995         1994 
                                                 ---------   ---------- 
<S>                                              <C>         <C>
Current deferred tax asset: 
 Accounts receivable reserve                     $ 48,584     $ 16,692 
 Liabilities not currently deductible              49,222       34,422 
 Other                                              1,039        2,582 
                                                   -------    --------- 
  Current deferred tax asset                     $ 98,845     $ 53,696 
                                                   =======    ========= 
Non-current deferred tax asset (liability): 
 Liabilities not currently deductible            $ 21,152     $ 33,572 
 Depreciation and amortization                    (15,090)     (13,979) 
                                                   -------    --------- 
   Non-current deferred tax asset                $  6,062     $ 19,593 
                                                   =======    ========= 
</TABLE>

   Income taxes payable at December 31, 1995 and 1994 consist of Federal 
income taxes payable of $34.2 million and $28.7 million, respectively, state 
income taxes payable of $5.0 million and $1.5 million, respectively, and 
foreign income taxes payable of $0.6 million and $0.3 million, respectively. 
The Company paid income taxes of $21.7 million, $58.5 million and $52.0 
million during 1995, 1994 and 1993, respectively. 

                                     F-13 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

5. PROVISION FOR RESTRUCTURING AND OTHER SPECIAL CHARGES 

   In the second quarter of 1995, the Company recorded a provision for 
restructuring totaling $33.0 million primarily for workforce reduction 
programs and the costs of exiting a number of leased facilities. 
Additionally, in the first quarter of 1995, the Company recorded a special 
charge of $12.8 million for the settlement of claims related to inadvertent 
billing errors of certain laboratory tests that were not completely and/or 
successfully performed or reported due to insufficient samples and/or invalid 
results. Additionally, in the fourth quarter of 1995, the Company recorded a 
charge of $4.8 million related to claims by the Civil Division of the U.S. 
Department of Justice ("DOJ") of alleged billing errors related to a 
laboratory test performed by Bioran prior to its acquisition by the Company. 

   In the third quarter of 1994, the Company recorded a provision for 
restructuring and other special charges totaling $79.8 million which included 
$48.2 million of integration costs, $21.6 million of transaction expenses 
related to the Nichols, MML and Bioran acquisitions, and $10 million of 
settlement reserves primarily related to government investigations of billing 
practices by Nichols prior to its acquisition by the Company. The integration 
costs represent the expected costs for closing clinical laboratories in 
certain markets where duplicate Company, Nichols, MML or Bioran facilities 
existed at the time of the acquisitions. 

   In the third quarter of 1993, the Company recorded a provision for 
restructuring costs and other special charges totaling $99.6 million. The 
restructuring component of this special charge aggregated $56.6 million and 
consisted primarily of asset write-offs, facility related costs and costs for 
workforce reduction programs related principally to the integration of the 
Company's operations with those acquired in the Damon acquisition. 

   The special charge of $43 million consists of a $36.5 million charge to 
reflect the settlement and related legal expenses associated with a 
compromise agreement with the DOJ to settle claims brought on behalf of the 
Inspector General, U.S. Department of Health and Human Services and a $6.5 
million charge for related asserted and unasserted claims. The DOJ claims 
related to the marketing, sale, pricing and billing of certain blood-test 
series provided to Medicare patients. The DOJ settlement does not constitute 
an admission with respect to any issue arising from subsequent civil actions. 

   The following summarizes the Company's restructuring activity (in 
millions): 

<TABLE>
<CAPTION>
                                       1993 and 1994      Amounts       Balance at         1995        Amounts     Balance at 
                                       Restructuring      Utilized     December 31,   Restructuring   Utilized    December 31, 
                                         Provisions     Through 1994       1994         Provision      in 1995        1995 
                                        -------------   -------------   ------------   -------------   --------   ------------- 
<S>                                     <C>             <C>             <C>            <C>             <C>        <C>
Employee termination costs                 $  32.5         $14.8           $17.7          $23.4         $27.0        $14.1 
Write-off of fixed assets                    35.6           19.1            16.5            3.7           9.2         11.0 
Costs of exiting leased facilities           21.7            9.3            12.4            3.1           6.8          8.7 
Other                                        15.0           13.4             1.6            2.8            .5          3.9 
                                        ------------     ------------    -----------    ------------     ------    ------------ 
 Total                                     $104.8          $56.6           $48.2          $33.0         $43.5        $37.7 
                                        ============     ============    ===========    ============     ======    ============ 
</TABLE>

                                     F-14 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

   The substantial portion of the balance at December 31, 1995 is expected to 
be expended in 1996. 

   Employee termination costs included severance benefits related to 
approximately 3,300 employees (700, 2,000 and 600 in 1995, 1994 and 1993, 
respectively). The estimated number of employees to be terminated has been 
reduced to 2,355, all of which have been terminated or notified of their 
termination at December 31, 1995. Management expects that approximately 300 
terminations and the remaining business or facility exits will occur by the 
end of 1996. The decrease in the number of actual versus anticipated employee 
terminations is primarily attributable to higher than expected attrition. As 
a result of higher than expected average termination costs, management's 
estimate of total employee termination costs is unchanged. Certain severance 
and facility exit costs have payment terms extending beyond 1997. 

6. PROPERTY, PLANT AND EQUIPMENT 

   Property, plant and equipment at December 31, 1995 and 1994 consist of the 
following: 

<TABLE>
<CAPTION>
                                                         1995          1994 
                                                       ----------   ----------- 
<S>                                                    <C>          <C>
Land                                                   $  18,568    $  18,969 
Buildings and improvements                               186,192      173,546 
Laboratory equipment, furniture and fixtures             286,326      247,200 
Leasehold improvements                                    39,078       30,050 
Construction-in-progress                                  19,490       33,508 
                                                        --------    ---------- 
 Property and equipment, at cost                         549,654      503,273 
Less: accumulated depreciation and amortization         (253,538)    (215,711) 
                                                        --------    ---------- 
 Property and equipment, net                           $ 296,116    $ 287,562 
                                                        ========    ========== 
</TABLE>

Depreciation and amortization expense aggregated $56.8 million, $46.9 million 
and $38.1 million for 1995, 1994 and 1993, respectively. 

7. INTANGIBLE ASSETS 

   Intangible assets at December 31, 1995 and 1994 consist of the following: 

<TABLE>
<CAPTION>
                                                   1995           1994 
                                                -----------   ------------ 
<S>                                             <C>           <C>
Goodwill                                        $1,056,073     $1,043,089 
Customer lists                                      84,558        100,428 
Other (principally non-compete covenants)           50,626         61,401 
                                                 ----------    ----------- 
 Intangible assets, at cost                      1,191,257      1,204,918 
Less: accumulated amortization                    (160,624)      (151,724) 
                                                 ----------    ----------- 
 Intangible assets, net                         $1,030,633     $1,053,194 
                                                 ==========    =========== 
</TABLE>

   Amortization expense aggregated $44.7 million, $42.6 million and $28.4 
million for 1995, 1994 and 1993, respectively. 

                                     F-15 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

8. ACCOUNTS PAYABLE AND ACCRUED EXPENSES 

   Accounts payable and accrued expenses at December 31, 1995 and 1994 
consist of the following: 

<TABLE>
<CAPTION>
                                                              1995        1994 
                                                            ---------   ---------- 
<S>                                                         <C>         <C>
Accrued wages and benefits                                  $ 81,985    $ 74,519 
Restructuring, integration and other special charges          61,878      69,812 
Accrued expenses                                              57,338      34,851 
Trade accounts payable                                        31,129      36,169 
Accrued acquisition commitments                                8,195      21,536 
                                                              -------    --------- 
 Accounts payable and accrued expenses                      $240,525    $236,887 
                                                              =======    ========= 
</TABLE>

9. LONG-TERM DEBT 

   Long-term debt, exclusive of current maturities, at December 31, 1995 and 
1994, respectively, consists of the following: 

<TABLE>
<CAPTION>
                                                                     1995          1994 
                                                                   -----------   ----------- 
<S>                                                               <C>           <C>
Notes payable to Corning: 
 Revolving credit notes--interest at the London 
   Interbank offered rate ("LIBOR") plus 1/8% 
   to 1/4%, maturing 1997                                         $  605,636    $  551,982 
 Installment note with interest at 9%, maturing 2001                  90,000       100,000 
 Term note with interest at 6.24%, maturing 2003                     100,000       100,000 
 Term note with interest at 6.93%, maturing 2013                     100,000       100,000 
 Term note with interest at 7.17%, maturing 2004                     150,000       150,000 
 Term note with interest at 7.77%, maturing 2024                     100,000       100,000 
Note payable denominated in pounds Sterling, interest at the 
  London Interbank Sterling Rate minus 1%, due 2002                    8,049         8,516 
Mortgage note payable through 2011, interest at 9.25%                  6,138         6,355 
Capital lease obligations expiring through 2031                       32,518        32,538 
Other                                                                  3,225         3,663 
                                                                   ----------    ---------- 
 Total                                                            $1,195,566    $1,153,054 
                                                                   ==========    ========== 
</TABLE>

   Current maturities on long-term debt totaled $12.1 million and $12.6 
million at December 31, 1995 and 1994, respectively. 

   Long-term debt, including capital leases, maturing in each of the years 
subsequent to December 31, 1996 is as follows: 

<TABLE>
<CAPTION>
<S>                                 <C>
 Fiscal year ending December 31, 
1997                                $  261,131 
1998                                    10,493 
1999                                    10,530 
2000                                    10,576 
2001 and thereafter                    902,836 
                                     ---------- 
Total long-term debt                $1,195,566 
                                     ========== 
</TABLE>

                                     F-16 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

   Future minimum payments under capital leases and the present value thereof 
are as follows: 

<TABLE>
<CAPTION>
<S>                                                            <C>
 Fiscal year ending December 31, 
1997                                                           $  4,061 
1998                                                              3,846 
1999                                                              3,840 
2000                                                              3,948 
2001 and thereafter                                             116,102 
                                                                -------- 
Total future minimum payments under capital leases              131,797 
Less amount representing interest                               (99,279) 
                                                                -------- 
Present value of minimum payments under capital leases         $ 32,518 
                                                                ======== 
</TABLE>

   The Company paid interest of $74.2 million, $60.2 million and $41.2 
million during 1995, 1994 and 1993, respectively. 

   Based on borrowing rates currently available to the Company for loans with 
similar terms and maturities, the fair value of loans payable to third 
parties (carrying amount of approximately $50.0 million) was approximately 
$62.0 million at December 31, 1995. 


   
    As discussed in Note 14, the Company is currently pursuing the issuance of
$150 million of Senior Subordinated Notes due in 2006 which will be used to
repay certain intercompany indebtedness owed to Corning. The Senior Subordinated
Notes will be guaranteed, fully, jointly and severally, and unconditionally, on
a senior subordinated basis by each of the Company's wholly-owned, domestic
subsidiaries (Subsidiary Guarantors). Non-guarantor subsidiaries, individually
and in the aggregate, are inconsequential to the Company. Full financial
statements of the Subsidiary Guarantors are not presented because management
believes they are not material to investors. The following is summarized
financial information of the Subsidiary Guarantors as of December 31, 1995 and
1994 and for each of the three years in the period ended December 31, 1995.
    

<TABLE>
<CAPTION>
                              December 31, 
                          --------------------- 
                            1995        1994 
                         --------    ---------- 
<S>                      <C>         <C>
Current assets            $244,547    $248,793 
Noncurrent assets          864,351     916,499 

Current liabilities         71,828      84,223 
Noncurrent 
  liabilities              682,805     692,742 
Stockholder's equity       354,265     388,227 
</TABLE>

<TABLE>
<CAPTION>
                       For the Year Ended December 31, 
                       --------------------------------- 
                        1995        1994         1993 
                      --------    --------    ---------- 
<S>                   <C>         <C>         <C>
Net revenues          $930,472    $923,205     $749,090 
Cost of services       587,100     581,397      447,246 
Net income (loss)      (33,961)    (44,056)         258 
</TABLE>

                                     F-17 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

10. EMPLOYEE RETIREMENT PLANS 

   Defined Benefit Plans 

   An acquired entity had a defined benefit pension plan which in 1990 was 
frozen as to the further accrual of benefits. At December 31, 1995 the 
present value of the projected benefit obligation using a discount rate of 
7.5% was $22.6 million and the fair value of the plan assets (publicly traded 
corporate debt and equity securities, government obligations and money market 
funds) was $17.4 million. The difference between the projected benefit 
obligation and the fair value of plan assets is included in other long-term 
liabilities in the accompanying combined balance sheet. 

   Defined Contribution Plans 

   The Company has several defined contribution plans covering substantially 
all of its full-time employees. Company contributions to these plans 
aggregated $18.5 million, $15.9 million and $7.3 million for 1995, 1994 and 
1993, respectively. 

11. RELATED PARTY TRANSACTIONS 

   The Company, in the ordinary course of business, conducts a number of 
transactions with Corning and its affiliates. The significant transactions 
occurring during the years ended December 31, 1995, 1994 and 1993 are as 
follows: 

<TABLE>
<CAPTION>
                                       1995       1994       1993 
                                      --------  --------   --------- 
<S>                                  <C>        <C>        <C>
Interest expense on borrowings       $78,930    $55,835    $28,400 
Purchase of laboratory supplies       11,261     11,607      7,338 
Corporate fees                         2,800      2,800      2,450 
</TABLE>

   Certain executives of the Company are included in various stock 
compensation programs of Corning. Expenses related to these programs have 
been included in the Company's combined financial statements. 

   In 1994, Corning contributed capital of $25.2 million through the 
reduction of revolving credit notes and former S-Corporation shareholders 
contributed capital of a building approximating $4.4 million. 

12. COMMITMENTS AND CONTINGENCIES 

   Minimum rental commitments under noncancellable operating leases, 
primarily real estate, in effect at December 31, 1995 are as follows: 

<TABLE>
<CAPTION>
<S>                             <C>
 Year ending December 31, 
1996                            $ 40,459 
1997                              30,481 
1998                              20,527 
1999                              14,877 
2000                              12,532 
2001 and thereafter               65,920 
                                  ------- 
Net minimum lease payments      $184,796 
                                  ======= 
</TABLE>

                                     F-18 
<PAGE> 
                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

   Operating lease rental expense for 1995, 1994 and 1993 aggregated $46.9 
million, $49.4 million and $46.9 million, respectively. 

   The Company is self-insured for substantially all casualty losses and 
maintains supplemental coverage on a claims made basis. The basis for the 
insurance reserve at December 31, 1995 and 1994 is the actuarially determined 
projected losses for each program (within the self-insured retention) based 
upon the Company's loss experience. 

   The Company has entered into several settlement agreements with various 
governmental and private payors during recent years. At present, government 
investigations of certain practices by clinical laboratories acquired in 
recent years are ongoing. In addition, certain payors are reviewing their 
reimbursement practices for laboratory tests. The results of these 
investigations and reviews may result in additional settlement payments or 
reductions in reimbursements for certain tests. The recorded reserves of 
approximately $37.0 million are included in accrued liabilities and represent 
management's best estimate at December 31, 1995. Based on information then 
available to CCL, management did not believe that the exposure to claims in 
excess of recorded reserves would be material (see Note 13). 

13. SUBSEQUENT EVENTS 

   As disclosed in Note 12, federal government investigations of certain 
practices by clinical laboratories acquired in recent years are ongoing. In 
the second quarter of 1996, the DOJ notified the Company that it has taken 
issue with certain payments received by Damon from federally funded 
healthcare programs prior to its acquisition by the Company. Specifically, in 
late April 1996, the DOJ for the first time disclosed to CCL the total amount 
of the claims that it proposed to assert against Damon. The government 
presented its claim for the base recoupment (by lab, by test, by year) and 
discussed various theories on which criminal and civil payments of up to 
three times the various base recoupment amounts could be assessed. During May 
and June, CCL management analyzed the government's claim in detail. CCL 
management and outside counsel then believed that there were meritorious 
defenses to a number of the claims for recoupments and potential payments in 
excess of the base recoupment and these were presented to the government in 
early July 1996. 

   
   At the end of the second quarter, CCL recorded a $46 million charge to
increase its reserves to $72 million, equal management's estimate of the low end
of the range of amounts necessary to satisfy claims related to Damon and other
related and similar investigations. With respect to the Damon investigation, the
low end of the range was estimated to be equal to the base recoupment sought by
the government reflecting the basis on which CCL had settled an earlier claim
with the government in 1993. The low end of the range for the Nichols and other
government investigations was based on the base recoupment estimated by
management from internal investigations. Reserves for pending private claims
were estimated based on CCL's experience in settling private claims following
its 1993 government settlement.

    CCL management considered the potential for some payments to be assessed in
excess of the base recoupment in estimating its liability at June 30, 1996.
Management estimated that the range of reasonably possible amounts necessary to
satisfy claims related to Damon and other related and similar investigations was
between $72 million and approximately $300 million at June 30, 1996, and,
because no amount in the range was more probable than other amounts, CCL
increased its reserves to equal the low end of the range. This position was
based on CCL's experience with the government in 1993, in which the recovery in
excess of base recoupments was not significant, the government's
representatives' invitation to present information and arguments to them and
their stated intention not to consider the issue of payment multiples until the
base recoupment amount had been established, and management's and counsel's
belief that it had meritorious factual, legal and equitable defenses and
mitigations of the government claims.
    

   CCL management was aware that similar investigations of other clinical 
laboratories in the industry were ongoing. Other than CCL's 1993 settlement, 
the only other similar settlement known to management was the 1992 civil 
Medicare settlement by a major competitor for $100 million. CCL had reviewed 
the publicly-available 

                                     F-19 
<PAGE> 



                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 



information about that settlement, including press releases and the 
settlement agreement. The competitor's settlement agreement did not specify 
whether the civil settlement included substantial payments to be assessed in 
excess of the base recoupment. It was believed by CCL that it did not. 
Although the competitor and its chief executive officer each pleaded guilty 
to criminal charges, the fine was only $1 million for conduct that was 
contemporaneous with, and considered by CCL management and its counsel to be 
more egregious than, that of Damon. 



   During the third quarter 1996, CCL management met with the government 
several times to evaluate the substance of the government's allegations. 
During a meeting with the government in mid-August, further information and 
legal arguments were exchanged. Importantly, at this time, the government for 
the first time began to disclose to CCL and its outside counsel grand jury 
testimony and other evidence that was inconsistent with certain of CCL's 
defenses. 



   The final settlement discussions began in late September. The government 
responded to and rejected many of CCL's defenses and made its tentative final 
settlement offer, which included significant payments in excess of base 
recoupments, to CCL. Negotiations on the final settlement amount and terms 
(including releases from various federal and state payors, compliance program 
requirements, etc.) continued into early October and ended with the 
settlement agreement dated October 9, 1996. The settlement included base 
recoupments of approximately $40 million (which did not differ materially 
from management's estimate at June 30, 1996) and total criminal and civil 
payments in excess of base recoupments of approximately $80 million. This 
settlement concludes all federal and Medicaid claims relating to the billing 
by Damon of certain blood tests to Medicare and Medicaid patients and other 
matters relating to Damon being investigated by the DOJ. Additionally, the 
Company entered into a separate settlement agreement with the DOJ totaling 
$6.9 million related to billings of hematology indices provided with 
hematology test results. This claim will be paid during the fourth quarter of 
1996. 



   As a result of these settlement agreements, CCL management has reassessed 
the level of reserves recorded for other asserted and unasserted claims 
related to the Damon and other similar government investigations, including 
the investigation of billing practices by Nichols prior to its acquisition by 
the Company in 1994. The Company recorded a charge totaling $142 million in 
the third quarter 1996 to establish additional reserves to provide for the 
above settlement agreements and management's best estimate of potential 
amounts which could be required to satisfy the remaining claims. At September 
30, 1996, recorded reserves approximated $215 million (including the $119 
million Damon settlement paid in October 1996). Based on information 
currently available to CCL, management does not believe that the exposure to 
claims in excess of recorded claims is material. Although the Damon 
settlement was substantially in excess of amounts anticipated by management, 
it was primarily due to the civil and criminal payments in excess of the base 
recoupment assessed by the government and CCL has now increased its reserves 
for asserted and unasserted claims to approximate the amount that may be 
required to settle the Nichols and other government civil claims taking into 
account the basis for the Damon civil settlement. In addition, although there 
is the possibility that CCL could be excluded from participation in Medicare 
and Medicaid programs, management believes that the possibility is remote as 
a result of the Damon settlement, which included CCL's signing a Corporate 
Integrity Agreement, and due to the fact that the government has publicly 
commended CCL for its cooperation in the investigation and cited CCL as 
having one of the "model" compliance programs in the industry. 



   In October 1996, Corning contributed $119 million to CCL's capital to fund 
the Damon settlement. Additionally, Corning has agreed to fund any additional 
settlements prior to the CCL Spin-Off Distribution and to indemnify CCL 
against all settlements for any governmental claims relating to billing 
practices of CCL and its predecessors that have been settled or are pending 
on the Distribution Date. Corning will also agree to indemnify CCL for 50% of 
the aggregate of all settlement payments made by CCL that are in excess of 
$42 million to private parties that relate to indemnified or previously 
settled governmental claims (such as the Damon settlement) for services 
provided prior to the Distribution Date; however, the indemnification of 
private party claims will not exceed $25 million and will be paid on an 
after-tax basis. Such indemnification will not cover any nongovernmental 
claims not settled prior to five years after the Distribution Date. 
Coincident with the CCL Spin-Off Distribution, the 



                                     F-20 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 


Company will record a receivable and a contribution of capital from Corning 
currently estimated at $25 million which is equal to management's best 
estimate of amounts which are probable of being received from Corning to 
satisfy the remaining indemnified governmental claims on an after-tax basis. 



   Although management believes that established reserves for both 
indemnified and non-indemnified claims are sufficient, it is possible that 
additional information (such as the indication by the government of criminal 
activity, additional tests being questioned or other changes in the 
government's theories of wrongdoing) may become available which may cause the 
final resolution of these matters to exceed established reserves by an amount 
which could be material to the Company's results of operations and, for 
non-indemnified claims, the Company's cash flows in the period in which such 
claims are settled. The Company does not believe that these issues will have 
a material adverse effect on the Company's overall financial condition. 


   In addition to the $142 million special charge discussed above, in the 
third quarter of 1996, the Company recorded a special charge of $13.7 million 
to write off capitalized software as a result of its decision to abandon the 
billing system which had been intended as its standard company-wide billing 
system. Management now plans to standardize billing systems using a system 
already implemented in seven of its sites. 

14. SPIN-OFF DISTRIBUTION (unaudited) 

   Coincident with the CCL Spin-Off Distribution, the Company plans to record 
a non-recurring charge of approximately $20 million ($13 million after tax) 
associated with the CCL Spin-Off Distribution. The largest component of the 
charge will be the cost of establishing an employee stock ownership plan ($11 
million). The remainder of the charge will consist principally of the costs 
for advisors and other fees associated with establishing the Company as a 
separate publicly-traded entity. The amount of the charge is subject to 
change based on the price of the CCL stock on the Distribution Date. 


   Prior to the CCL Spin-Off Distribution, the Company will borrow 
approximately $500 million in long-term debt to repay Corning for certain 
intercompany borrowings. The debt is assumed to consist of $350 million of 
bank borrowings and $150 million of publicly-registered high-yield notes. 
Corning will contribute the remaining debt to the Company's equity prior to 
the CCL Spin-Off Distribution. The credit facility governing the bank 
borrowings and the indenture governing the notes will contain various 
customary affirmative and negative covenants, including the maintenance of 
certain financial ratios and tests. The credit facility prohibits the Company 
from paying cash dividends on the CCL common stock. Further, the indenture 
will restrict the Company's ability to pay cash dividends based on a 
percentage of the Company's cash flow. 


   In conjunction with the CCL Spin-Off Distribution, Corning and the Company 
will enter into an indemnification agreement whereby Corning agrees to 
indemnify CCL, on an after-tax basis, for any losses arising out of any 
federal, criminal, civil or administrative investigations or claims that are 
pending as of the Distribution Date to the extent that such investigations or 
claims arise out of or are related to alleged violations of federal laws by 
reason of CCL, its affiliates, officers or directors billing any federal 
program or agency for services rendered to beneficiaries of such program or 
agency. 

   Corning, CCL and Covance will enter into tax indemnification agreements 
that will prohibit CCL and Covance for a period of two years after the 
Spin-Off Distributions from taking certain actions that might jeopardize the 
favorable tax treatment of the Distributions under section 355 of the 
Internal Revenue Code of 1986, as amended and will provide Corning and CCL 
with certain rights of indemnification against CCL and Covance. The tax 
indemnification agreements will also require CCL and Covance to take such 
actions as Corning may request to preserve the favorable tax treatment 
provided for in any rulings obtained from the Internal Revenue Service in 
respect of the Distributions. 

   Corning, CCL and Covance will also enter into a tax sharing agreement 
which will allocate among Corning, CCL and Covance responsibility for 
federal, state and local taxes relating to taxable periods before and after 
the 

                                     F-21 
<PAGE> 
                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
              NOTES TO COMBINED FINANCIAL STATEMENTS (Continued) 
              (dollars in thousands, unless otherwise indicated) 

Spin-Off Distributions and provide for computing and apportioning tax 
liabilities and tax benefits for such periods among the parties. 

15. PLANNED CHANGE IN ACCOUNTING POLICY (unaudited) 

   
   Coincident with the CCL Spin-Off Distribution, CCL management will adopt a
new accounting policy for evaluating the recoverability of intangible assets and
measuring possible impairment under Statement of the Accounting Principles Board
No. 17. Most of CCL's intangible assets resulted from purchase business
combinations in 1993. Significant changes in the clinical laboratory and health
care industries subsequent to 1993, including increased government regulation
and movement from traditional fee-for-service care to managed cost health care,
have caused the fair value of CCL's intangible assets to be significantly less
than carrying value. CCL management believes that a valuation of intangible
assets based on the amount for which each regional laboratory could be sold in
an arm's-length transaction is preferable to using projected undiscounted
pre-tax cash flows. CCL believes fair value is a better indicator of the extent
to which the intangible assets may be recoverable and therefore, may be
impaired. This change in method of evaluating the recoverability of intangible
assets will result in CCL recording a charge of between $400 million and $450
million to operations coincident with the CCL Spin-Off Distribution to reflect
the impairment of intangible assets. This will result in a reduction of
amortization expense of approximately $10 million to $11.3 million annually and
$2.5 million to $2.8 million quarterly.

    The fair value method will be applied to each of CCL's regional
laboratories. Management's estimate of fair value will primarily be based on
multiples of forecasted revenue or multiples of forecasted EBITDA. The multiples
will primarily be determined based upon publicly available information regarding
comparable publicly-traded companies in the industry, but will also consider (i)
the financial projections of each regional laboratory, (ii) the future prospects
of each regional laboratory, including its growth opportunities, managed care
concentration and likely operational improvements, and (iii) comparable sales
prices, if available. Multiples of revenues will be used to estimate fair value
in cases where the Company believes that the likely acquirer of a regional
laboratory would be a strategic buyer within the industry which would realize
synergies from such an acquisition. In regions where management does not believe
there is a potential strategic buyer within the industry, and, accordingly,
believes the likely buyer would not have synergy opportunities, multiples of
EBITDA will be used for estimating fair value. Regional laboratories with lower
levels of profitability valued using revenue multiples would generally be
ascribed a higher value than if multiples of EBITDA were used, due to assumed
synergy opportunities. Management's estimate of fair value is currently based on
multiples of revenue primarily ranging from 0.5 to 0.7 times revenue and on
multiples of EBITDA primarily ranging from 5 to 6 times EBITDA. While management
believes the estimation methods are reasonable and reflective of common
valuation practices, there can be no assurance that a sale to a buyer for the
estimated value ascribed to a regional laboratory could be completed. Changes to
the method of valuing regional laboratories will be made only when there is a
significant and fundamental change in facts and circumstances, such as
significant changes in market position or the entrance or exit of a significant
competitor from a regional market.
    

   For purposes of estimating the fair value of each of the regional 
laboratories, management assumed that a potential buyer would seek to be 
indemnified for litigation or other contingencies resulting from 
preacquisition activities. Therefore, the reserves recorded for potential, 
and settled, billing and marketing claims were not allocated to the regional 
laboratories for purposes of estimating their fair value. 

   
    On a quarterly basis, CCL management will perform a review of each regional
laboratory to determine if events or changes in circumstances have occurred
which could have a material adverse effect on the fair value of the business and
its intangible assets. If such events or changes in circumstances were deemed to
have occurred, management would consult with one or more of its investment
bankers in estimating the impact on fair value of the regional laboratory.
Should the estimated fair value of a regional laboratory be less than the net
book value for such laboratory at the end of a quarter, the Company would record
a charge to operations to recognize an impairment of its intangible assets for
such difference.
    

                                     F-22 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
                 Schedule II--Valuation Accounts and Reserves 
                            (amounts in thousands) 

<TABLE>
<CAPTION>
                                      Balance at                Net Deductions     Balance at 
Year ended December 31, 1995            1-1-95     Additions      and Other        12-31-95 
                                      ----------   ----------   --------------    ----------- 
<S>                                    <C>          <C>            <C>              <C>  
Doubtful accounts and allowances       $ 74,829     $152,590       $ 79,472         $147,947 

                                      Balance at                Net Deductions     Balance at 
Year ended December 31, 1994            1-1-94     Additions      and Other         12-31-94 
                                      ----------   ----------   --------------     ----------- 
Doubtful accounts and allowances        $71,991      $59,480        $56,642          $74,829 

                                      Balance at                Net Deductions     Balance at 
Year ended December 31, 1993            1-1-93     Additions      and Other         12-31-93 
                                      ----------   ---------    --------------    ----------- 
Doubtful accounts and allowances        $65,859      $47,240       $ 41,108          $71,991 

</TABLE>


                                     F-23 
<PAGE> 

                   QUARTERLY OPERATING RESULTS (unaudited) 

<TABLE>
<CAPTION>

                                   First         Second           Third          Fourth          Total 
                                  Quarter        Quarter         Quarter         Quarter          Year 
                                -----------   -------------   -------------   -------------    ------------ 
<S>                              <C>             <C>             <C>             <C>            <C>

1996 
 ---------------------------- 
Net revenues                     $401,395        $ 424,543       $ 405,352 
Gross profit                      154,277          158,242         149,962 
Loss before taxes                  (1,642)         (37,518) (1)   (162,989) (1) 
Net loss                           (1,511)         (37,922)       (119,436) 

1995 
 ---------------------------- 
Net revenues                     $417,662        $ 421,853       $ 399,959       $ 389,914      $1,629,388 
Gross profit                      168,606          175,793         159,091         145,666         649,156 
Income (loss) before taxes         19,827 (1)       (5,088) (1)    (56,405) (2)    (15,902) (1)    (57,568) 
Net income (loss)                   4,423           (3,852)        (38,595)        (14,028)        (52,052) 

1994 
 ---------------------------- 
Net revenues                     $399,063        $ 422,942       $ 408,478       $ 403,216      $1,633,699 
Gross profit                      159,050          182,050         163,391         159,364         663,855 
Income (loss) before taxes         40,624           45,109         (51,250) (1)     28,272          62,755 
Net income (loss)                  24,152           24,148         (36,535)         16,580          28,345 
</TABLE>

(1) Includes impact of restructuring and other special charges of $46.0 
    million, $155.7 million, $12.8 million, $33.0 million, $4.8 million and 
    $79.8 million in second quarter 1996, third quarter 1996, first quarter 
    1995, second quarter 1995, fourth quarter 1995 and third quarter 1994, 
    respectively, which are discussed in Notes 5 and 13 to the CCL Combined 
    Financial Statements. 
(2) Includes a $62.0 million charge to increase the reserve for doubtful 
    accounts and allowances resulting from billing systems implementation and 
    integration problems at certain laboratories and increased regulatory 
    requirements. 

                                     F-24 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                           COMBINED BALANCE SHEETS 
                   SEPTEMBER 30, 1996 AND DECEMBER 31, 1995 
                                (in thousands) 

<TABLE>
<CAPTION>
                                                               September 30,   December 31, 
                                                                   1996            1995 
                                                               -------------   ------------- 
                                                                (unaudited) 
<S>                                                            <C>             <C>
ASSETS 
- ------------------------------------------------------------ 
Current Assets: 
 Cash and cash equivalents                                      $   48,319      $   36,446 
 Accounts receivable, net of allowance of $116,996 and 
   $147,947 for September 30, 1996 and December 31, 1995, 
   respectively                                                    323,171         318,252 
 Inventories                                                        25,559          26,601 
 Deferred taxes on income                                          126,906          98,845 
 Prepaid expenses and other assets                                  25,217          22,014 
                                                                ------------    ------------ 
  Total current assets                                             549,172         502,158 
Property and equipment, net                                        293,490         296,116 
Intangible assets, net                                           1,001,500       1,030,633 
Other assets                                                        42,216          24,478 
                                                                ------------    ------------ 
TOTAL ASSETS                                                    $1,886,378      $1,853,385 
                                                                ============    ============ 

LIABILITIES AND STOCKHOLDER'S EQUITY 
- ------------------------------------------------------------ 
Current Liabilities: 
 Accounts payable and accrued expenses                          $  374,058      $  240,525 
 Current portion of long-term debt                                  11,885          12,148 
 Income taxes payable                                               34,212          39,766 
 Due to Corning Incorporated and affiliates                         14,299           8,979 
                                                                ------------    ------------ 
  Total current liabilities                                        434,454         301,418 
Long-term debt (principally due to Corning Incorporated)         1,219,900       1,195,566 
Other liabilities                                                   99,354          60,600 
                                                                ------------    ------------ 
 Total liabilities                                               1,753,708       1,557,584 
                                                                ============    ============ 

Stockholder's Equity: 
 Contributed capital                                               297,823         297,823 
 Accumulated deficit                                              (163,158)         (3,118) 
 Cumulative translation adjustment                                   1,801           2,325 
 Market valuation adjustment                                        (3,796)         (1,229) 
                                                                ------------    ------------ 
  Total stockholder's equity                                       132,670         295,801 
                                                                ------------    ------------ 
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY                      $1,886,378      $1,853,385 
                                                                ============    ============ 
</TABLE>

The accompanying notes are an integral part of these statements. 

                                     F-25 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                      COMBINED STATEMENTS OF OPERATIONS 
       FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 1996 AND 1995 
                                (in thousands) 
                                 (unaudited) 

<TABLE>
<CAPTION>
                                                         Three Months Ended               Nine Months Ended 
                                                   September 30,   September 30,   September 30,    September 30, 
                                                       1996             1995            1996            1995 
                                                    -------------   -------------   -------------   -------------- 
<S>                                                 <C>             <C>             <C>             <C>
Net revenues                                         $ 405,352        $399,959       $1,231,290      $1,239,474 
Costs and expenses: 
 Cost of services                                      255,390         240,868          768,809         735,984 
 Selling, general and administrative                   125,190         181,346          371,439         399,635 
 Provision for restructuring and other special 
   charges                                             155,730              --          201,730          45,885 
 Interest expense, net                                  19,866          20,927           59,887          61,529 
 Amortization of intangible assets                      10,328          11,293           31,772          33,678 
 Other, net                                              1,837           1,930             (198)          4,429 
                                                    ------------    ------------    ------------     ------------- 
  Total                                                568,341         456,364        1,433,439       1,281,140 
                                                    ------------    ------------    ------------     ------------- 
Loss before taxes                                     (162,989)        (56,405)        (202,149)        (41,666) 
Income tax benefit                                     (43,553)        (17,810)         (43,280)         (3,642) 
                                                    ------------    ------------    ------------     ------------- 
Net loss                                             $(119,436)       $(38,595)      $ (158,869)     $  (38,024) 
                                                    ============    ============    ============     ============= 
</TABLE>

The accompanying notes are an integral part of these statements. 

                                     F-26 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                      COMBINED STATEMENTS OF CASH FLOWS 
            FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1996 AND 1995 
                                (in thousands) 
                                 (unaudited) 

<TABLE>
<CAPTION>
                                                                  1996          1995 
                                                               -----------   ----------- 
<S>                                                            <C>           <C>
Cash flows from operating activities: 
Net loss                                                        $(158,869)    $ (38,024) 
Adjustments to reconcile net loss to net cash provided by 
operating activities: 
 Depreciation and amortization                                     75,232        76,036 
 Provision for doubtful accounts                                   81,891       127,297 
 Provision for restructuring and other special charges            201,730        45,885 
 Deferred income tax provision                                    (31,612)      (39,403) 
 Other, net                                                          (753)        4,984 
 Changes in operating assets and liabilities: 
  Accounts receivable                                             (87,339)     (112,110) 
  Accounts payable and accrued expenses                             3,355        18,732 
  Restructuring, integration and other special charges            (19,863)      (49,836) 
  Due from/to Corning Incorporated and affiliates                   5,320         4,572 
  Changes in other assets and liabilities                         (27,155)       15,656 
                                                                ----------    ---------- 
Net cash provided by operating activities                          41,937        53,789 
                                                                ----------    ---------- 
Cash flows from investing activities: 
 Capital expenditures                                             (58,802)      (56,062) 
 Acquisition of businesses, net of cash acquired                       --       (22,907) 
 (Increase) decrease in investments                                (7,580)        1,058 
 Proceeds from sale of assets                                      13,285            -- 
                                                                ----------    ---------- 
Net cash used in investing activities                             (53,097)      (77,911) 
                                                                ----------    ---------- 
Cash flows from financing activities: 
 Proceeds from borrowings, primarily with Corning 
   Incorporated                                                    59,090        63,795 
 Repayment of long-term debt                                      (34,885)       (3,766) 
 Dividends paid                                                    (1,172)      (27,718) 
                                                                ----------    ---------- 
Net cash provided by financing activities                          23,033        32,311 
                                                                ----------    ---------- 
Net change in cash and cash equivalents                            11,873         8,189 
Cash and cash equivalents, beginning of year                       36,446        38,719 
                                                                ----------    ---------- 
Cash and cash equivalents, end of period                        $  48,319     $  46,908 
                                                                ==========    ========== 
</TABLE>

The accompanying notes are an integral part of these statements. 

                                     F-27 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
                NOTES TO INTERIM COMBINED FINANCIAL STATEMENTS 
                                 (unaudited) 

1. BASIS OF PRESENTATION 

   Corning Clinical Laboratories Inc. and Corning Nichols Institute Inc. 
(collectively referred to as "CCL" or the "Company") are wholly-owned 
subsidiaries of Corning Life Sciences Inc. ("CLSI") which in turn is a 
wholly-owned subsidiary of Corning Incorporated ("Corning"). The Company is 
one of the largest clinical laboratory testing businesses in the United 
States. These financial statements present the carved-out results of 
operations, cash flows and financial position of Corning's clinical 
laboratory testing business. Covance Inc. (formerly Corning Pharmaceutical 
Services Inc.), a subsidiary of CCL, and its related entities ("Covance") as 
well as environmental testing services formerly provided by CCL are excluded. 

   In May 1996, Corning's Board of Directors approved a plan to distribute to 
its shareholders on a pro rata basis all of the shares of CCL and Covance 
(the "CCL and Covance Spin-Off Distributions"). The result of the plan will 
be the creation of two independent, publicly-owned companies. As a result of 
the Spin-Off Distributions, CCL will operate Corning's clinical laboratory 
testing business as an independent public company and Covance will own and 
operate Corning's contract research business as an independent public 
company. The Spin-Off Distributions will be effected by the distribution of a 
dividend to holders of Corning Common Stock of all of the outstanding CCL 
Common Stock, followed immediately by the distribution of a dividend to the 
holders of CCL Common Stock of all of the Covance Common Stock. Corning has 
submitted to the Internal Revenue Service a request for a ruling that the 
Spin-Off Distributions qualify as tax-free distributions under the Internal 
Revenue Code of 1986. Coincident with the Spin-Off Distribution, the Company 
will be renamed Quest Diagnostics Incorporated. 

   The interim combined financial statements reflect all adjustments which, 
in the opinion of management, are necessary for a fair statement of the 
results of operations for the periods presented. All such adjustments are of 
a normal recurring nature. The interim combined financial statements have 
been compiled without audit and are subject to year-end adjustments. These 
interim combined financial statements should be read in conjunction with the 
historical combined financial statements of CCL for the years ended December 
31, 1995, 1994 and 1993 included elsewhere herein. 

2. COMMITMENTS AND CONTINGENCIES 


   As disclosed in the Company's 1995 combined financial statements, federal 
government investigations of certain practices by clinical laboratories 
acquired in recent years are ongoing. In the second quarter of 1996, the U.S. 
Department of Justice ("DOJ") notified the Company that it has taken issue 
with certain payments received by Damon Corporation ("Damon") from federally 
funded healthcare programs prior to its acquisition by the Company. 
Specifically, in late April 1996, the DOJ for the first time disclosed to CCL 
the total amount of the claims that it proposed to assert against Damon. The 
government presented its claim for the base recoupment (by lab, by test, by 
year) and discussed various theories on which criminal and civil payments of 
up to three times the various base recoupment amounts could be assessed. 
During May and June, CCL management analyzed the government's claim in 
detail. CCL management and outside counsel then believed that there were 
meritorious defenses to a number of the claims for recoupments and potential 
payments in excess of the base recoupment and these were presented to the 
government in early July 1996. 


    At the end of the second quarter, CCL recorded a $46 million charge to
increase its reserves to $72 million, to equal management's estimate of the low
end of the range of amounts necessary to satisfy claims related to Damon and
other related and similar investigations. With respect to the Damon
investigation, the low end of the range was estimated to be equal to the base
recoupment sought by the government reflecting the basis on which CCL had
settled an earlier claim with the government in 1993. The low end of the range
for the Nichols and other government investigations was based on the base
recoupment estimated by management from internal investigations. Reserves for
pending private claims were estimated based on CCL's experience in settling
private claims following its 1993 government settlement.

   
    CCL management considered the potential for some payments to be assessed in
excess of the base recoupment in estimating its liability at June 30, 1996.
    
                                     F-28 
<PAGE> 



                      CORNING CLINICAL LABORATORIES INC. 
              (a wholly-owned business of Corning Incorporated) 
          NOTES TO INTERIM COMBINED FINANCIAL STATEMENTS (Continued) 
                                 (unaudited) 


   
Management estimated that the range of reasonably possible amounts necessary to
satisfy claims related to Damon and other related and similar investigations was
between $72 million and approximately $300 million at June 30, 1996, and,
because no amount in the range was more probable than other amounts, CCL
increased its reserves to equal the low end of the range. This position was
based on CCL's experience with the government in 1993, in which the recovery in
excess of base recoupments was not significant, the government's
representatives' invitation to present information and arguments to them and
their stated intention not to consider the issue of payment multiples until the
base recoupment amount had been established, and management's and counsel's
belief that it had meritorious factual, legal and equitable defenses and
mitigations of the government claims.
    

   CCL management was aware that similar investigations of other clinical 
laboratories in the industry were ongoing. Other than CCL's 1993 settlement, 
the only other similar settlement known to management was the 1992 civil 
Medicare settlement by a major competitor for $100 million. CCL had reviewed 
the publicly-available information about that settlement, including press 
releases and the settlement agreement. The competitor's settlement agreement 
did not specify whether the civil settlement included substantial payments to 
be assessed in excess of the base recoupment. It was believed by CCL that it 
did not. Although the competitor and its chief executive officer each pleaded 
guilty to criminal charges, the fine was only $1 million for conduct that was 
contemporaneous with, and considered by CCL management and its counsel to be 
more egregious than, that of Damon. 



   During the third quarter 1996, CCL management met with the government 
several times to evaluate the substance of the government's allegations. 
During a meeting with the government in mid-August, further information and 
legal arguments were exchanged. Importantly, at this time, the government for 
the first time began to disclose to CCL and its outside counsel grand jury 
testimony and other evidence that was inconsistent with certain of CCL's 
defenses. 



   The final settlement discussions began in late September. The government 
responded to and rejected many of CCL's defenses and made its tentative final 
settlement offer, which included significant payments in excess of base 
recoupments, to CCL. Negotiations on the final settlement amount and terms 
(including releases from various federal and state payors, compliance program 
requirements, etc.) continued into early October and ended with the 
settlement agreement dated October 9, 1996. The settlement included base 
recoupments of approximately $40 million (which did not differ materially 
from management's estimate at June 30, 1996) and total criminal and civil 
payments in excess of base recoupments of approximately $80 million. This 
settlement concludes all federal and Medicaid claims relating to the billing 
by Damon of certain blood tests to Medicare and Medicaid patients and other 
matters relating to Damon being investigated by the DOJ. Additionally, the 
Company entered into a separate settlement agreement with the DOJ totaling 
$6.9 million related to billings of hematology indices provided with 
hematology test results. This claim will be paid during the fourth quarter of 
1996. 



   As a result of these settlement agreements, CCL management has reassessed 
the level of reserves recorded for other asserted and unasserted claims 
related to the Damon and other similar government investigations, including 
the investigation of billing practices by Nichols Institute ("Nichols") prior 
to its acquisition by the Company in 1994. The Company recorded a charge 
totaling $142 million in the third quarter 1996 to establish additional 
reserves to provide for the above settlement agreements and management's best 
estimate of potential amounts which could be required to satisfy the 
remaining claims. At September 30, 1996, recorded reserves approximated $215 
million (including the $119 million Damon settlement paid in October 1996). 
Based on information currently available to CCL, management does not believe 
that the exposure to claims in excess of recorded claims is material. 
Although the Damon settlement was substantially in excess of amounts 
anticipated by management, it was primarily due to the civil and criminal 
payments in excess of the base recoupment assessed by the government and CCL 
has now increased its reserves for asserted and unasserted claims to 
approximate the amount that may be required to settle the Nichols and other 
government civil claims taking into account the basis for the Damon civil 
settlement. In addition, although there is the possibility that CCL could be 
excluded from participation in Medicare and Medicaid programs, management 
believes that the possibility is remote as a result of the Damon settlement, 
which included CCL's signing a Corporate Integrity Agreement, and due to the 
fact that the government has publicly commended CCL for its cooperation in 
the investigation and cited CCL as having one of the "model" compliance 
programs in the industry. 



                                     F-29 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
          NOTES TO INTERIM COMBINED FINANCIAL STATEMENTS (Continued) 
                                 (unaudited) 


   In October 1996, Corning contributed $119 million to CCL's capital to fund 
the Damon settlement. Additionally, Corning has agreed to fund any additional 
settlements prior to the CCL Spin-Off Distribution and to indemnify CCL 
against all settlements for any governmental claims relating to billing 
practices of CCL and its predecessors that have been settled or are pending 
on the Distribution Date. Corning will also agree to indemnify CCL for 50% of 
the aggregate of all settlement payments made by CCL that are in excess of 
$42 million to private parties that relate to indemnified or previously 
settled governmental claims (such as the Damon settlement) for services 
provided prior to the Distribution Date; however, the indemnification of 
private party claims will not exceed $25 million and will be paid on an 
after-tax basis. Such indemnification will not cover any nongovernmental 
claims not settled prior to five years after the Distribution Date. 
Coincident with the CCL Spin-Off Distribution, the Company will record a 
receivable and a contribution of capital from Corning currently estimated at 
$25 million which is equal to management's best estimate of amounts which are 
probable of being received from Corning to satisfy the remaining indemnified 
governmental claims on an after-tax basis. 



   Although management believes that established reserves for both 
indemnified and non-indemnified claims are sufficient, it is possible that 
additional information (such as the indication by the government of criminal 
activity, additional tests being questioned or other changes in the 
government's theories of wrongdoing) may become available which may cause the 
final resolution of these matters to exceed established reserves by an amount 
which could be material to the Company's results of operations and, for 
non-indemnified claims, the Company's cash flow in the period in which such 
claims are settled. The Company does not believe that these issues will have 
a material adverse impact on the Company's overall financial condition. 



3. PROVISION FOR RESTRUCTURING AND OTHER SPECIAL CHARGES 

   In addition to the $142 million special charge discussed in Note 2, in the 
third quarter of 1996, the Company recorded a special charge of $13.7 million 
to write off capitalized software as a result of its decision to abandon the 
billing system which had been intended as its standard company-wide billing 
system. Management now plans to standardize billing systems using a system 
already implemented in seven of its sites. 

4. RESTRUCTURING RESERVES 

   As described in Note 5 to the CCL Combined Financial statements, CCL has 
recorded charges for restructuring plans in previous years. Reserves relating 
to these programs totaled approximately $37.7 million and $23.5 million at 
December 31, 1995 and September 30, 1996, respectively. Management believes 
that the costs of the restructuring plans will be financed through cash from 
operations and does not anticipate any significant impact on its liquidity as 
a result of the restructuring plans. 

5. SPIN-OFF DISTRIBUTION 

   
   Coincident with the CCL Spin-Off Distribution, the Company plans to record 
a non-recurring charge of approximately $20 million ($13 million after tax) 
associated with the CCL Spin-Off Distribution. The largest component of the 
charge will be the cost of establishing an employee stock ownership plan ($11 
million). The remainder of the charge will consist principally of the costs 
for advisors and other fees associated with establishing the Company as a 
separate publicly-traded entity. The amount of the charge is subject to 
change based on the price of the CCL stock on the Distribution Date. 
    

   Prior to the CCL Spin-Off Distribution, the Company will borrow 
approximately $500 million in long-term debt to repay Corning for certain 
intercompany borrowings. The debt is assumed to consist of $350 million of 
bank borrowings and $150 million of publicly-registered high-yield notes. 
Corning will contribute the remaining debt to the Company's equity prior to 
the CCL Spin-Off Distribution. The credit facility governing the bank 
borrowings and the indenture governing the notes will contain various 
customary affirmative and negative covenants , including the maintenance of 
certain financial ratios and tests. The credit facility prohibits the Company 
from paying cash dividends on the CCL common stock. Further, the indenture 
will restrict the Company's ability to pay cash dividends based on a 
percentage of the Company's cash flow. 

                                     F-30 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
          NOTES TO INTERIM COMBINED FINANCIAL STATEMENTS (Continued) 
                                 (unaudited) 

   In conjunction with the CCL Spin-Off Distribution, Corning and the Company 
will enter into an indemnification agreement whereby Corning agrees to 
indemnify CCL, on an after-tax basis, for any losses arising out of any 
federal, criminal, civil or administrative investigations or claims that are 
pending as of the Distribution Date to the extent that such investigations or 
claims arise out of or are related to alleged violations of federal laws by 
reason of CCL, its affiliates, officers or directors billing any federal 
program or agency for services rendered to beneficiaries of such program or 
agency. 

   Corning, CCL and Covance will enter into tax indemnification agreements 
that will prohibit CCL and Covance for a period of two years after the 
Spin-Off Distributions from taking certain actions that might jeopardize the 
favorable tax treatment of the Distributions under section 355 of the 
Internal Revenue Code of 1986, as amended and will provide Corning and CCL 
with certain rights of indemnification against CCL and Covance. The tax 
indemnification agreements will also require CCL and Covance to take such 
actions as Corning may request to preserve the favorable tax treatment 
provided for in any rulings obtained from the Internal Revenue Service in 
respect of the Distributions. 

   Corning, CCL and Covance will also enter into a tax sharing agreement 
which will allocate among Corning, CCL and Covance responsibility for 
federal, state and local taxes relating to taxable periods before and after 
the Spin-Off Distributions and provide for computing and apportioning tax 
liabilities and tax benefits for such periods among the parties. 

6. PLANNED CHANGE IN ACCOUNTING POLICY 

   
   Coincident with the CCL Spin-Off Distribution, CCL management will adopt a
new accounting policy for evaluating the recoverability of intangible assets and
measuring possible impairment under Statement of the Accounting Principles Board
No. 17. Most of CCL's intangible assets resulted from purchase business
combinations in 1993. Significant changes in the clinical laboratory and health
care industries subsequent to 1993, including increased government regulation
and movement from traditional fee-for-service care to managed cost health care,
have caused the fair value of CCL's intangible assets to be significantly less
than carrying value. CCL management believes that a valuation of intangible
assets based on the amount for which each regional laboratory could be sold in
an arm's-length transaction is preferable to using projected undiscounted
pre-tax cash flows. CCL believes fair value is a better indicator of the extent
to which the intangible assets may be recoverable and therefore, may be
impaired. This change in method of evaluating the recoverability of intangible
assets will result in CCL recording a charge of between $400 million and $450
million to operations coincident with the CCL Spin-Off Distribution to reflect
the impairment of intangible assets. This will result in a reduction of
amortization expense of approximately $10 million to $11.3 million annually and
$2.5 million to $2.8 million quarterly.

    The fair value method will be applied to each of CCL's regional
laboratories. Management's estimate of fair value will primarily be based on
multiples of forecasted revenue or multiples of forecasted EBITDA. The multiples
will primarily be determined based upon publicly available information regarding
comparable publicly-traded companies in the industry, but will also consider (i)
the financial projections of each regional laboratory, (ii) the future prospects
of each regional laboratory, including its growth opportunities, managed care
concentration and likely operational improvements, and (iii) comparable sales
prices, if available. Multiples of revenues will be used to estimate fair value
in cases where the Company believes that the likely acquirer of a regional
laboratory would be a strategic buyer within the industry which would realize
synergies from such an acquisition. In regions where management does not believe
there is a potential strategic buyer within the industry, and, accordingly,
believes the likely buyer would not have synergy opportunities, multiples of
EBITDA will be used for estimating fair value. Regional laboratories with lower
levels of profitability valued using revenue multiples would generally be
ascribed a higher value than if multiples of EBITDA were used, due to assumed
synergy opportunities. Management's estimate of fair value is currently based on
multiples of revenue primarily ranging from 0.5 to 0.7 times revenue and on
multiples of EBITDA primarily ranging from 5 to 6 times EBITDA. While management
believes the estimation methods are reasonable and reflective of common
valuation practices, there can be no assurance that a sale to a buyer for the
estimated value ascribed to a regional laboratory could be completed. Changes to
the method of valuing regional laboratories will be made only when there is a
significant and fundamental change in facts and circumstances, such as
significant changes in market position or the entrance or exit of a significant
competitor from a regional market.
    

                                     F-31 
<PAGE> 

                      CORNING CLINICAL LABORATORIES INC. 
                (to be renamed Quest Diagnostics Incorporated) 
              (a wholly-owned business of Corning Incorporated) 
          NOTES TO INTERIM COMBINED FINANCIAL STATEMENTS (Continued) 
                                 (unaudited) 

   For purposes of estimating the fair value of each of the regional 
laboratories, management assumed that a potential buyer would seek to be 
indemnified for litigation or other contingencies resulting from 
preacquisition activities. Therefore, the reserves recorded for potential, 
and settled, billing and marketing claims were not allocated to the regional 
laboratories for purposes of estimating their fair value. 

   
    On a quarterly basis, CCL management will perform a review of each regional
laboratory to determine if events or changes in circumstances have occurred
which could have a material adverse effect on the fair value of the business and
its intangible assets. If such events or changes in circumstances were deemed to
have occurred, management would consult with one or more of its investment
bankers in estimating the impact on fair value of the regional laboratory.
Should the estimated fair value of a regional laboratory be less than the net
book value for such laboratory at the end of a quarter, the Company would record
a charge to operations to recognize an impairment of its intangible assets for
such difference.
    


7. SUMMARIZED FINANCIAL INFORMATION 

   
    As discussed in Note 5, the Company is currently pursuing the issuance of
$150 million of Senior Subordinated Notes due in 2006 which will be used to
repay certain intercompany indebtedness owed to Corning. The Senior Subordinated
Notes will be guaranteed, fully, jointly and severally, and unconditionally, on
a senior subordinated basis by each of the Company's wholly-owned, domestic
subsidiaries (Subsidiary Guarantors). Non-guarantor subsidiaries, individually
and in the aggregate, are inconsequential to the Company. Full financial
statements of the Subsidiary Guarantors are not presented because management
believes they are not material to investors. The following is summarized
financial information of the Subsidiary Guarantors as of September 30, 1996 and
December 31, 1995 and for the nine months ended September 30, 1996 and September
30, 1995.
    

<TABLE>
<CAPTION>
                         September 30,    December 31, 
                              1996            1995 
                          -------------   -------------- 
<S>                       <C>               <C>
Current assets            $234,183          $244,547 
Noncurrent assets          865,265           864,351 

Current liabilities         71,416            71,828 
Noncurrent liabilities     694,331           682,805 
Stockholder's equity       333,701           354,265 

                            For the nine months ended 
                                   September 30, 
                          ----------------------------- 
                              1996             1995 
                          ------------     ------------- 
Net revenues                $677,489        $709,317 
Cost of services             427,583         444,705 
Net loss                     (20,564)        (26,435) 
</TABLE>

                                     F-32 


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