Exhibit 10.3

                                OMNIBUS AMENDMENT

          THIS OMNIBUS AMENDMENT (this "Amendment") is entered into as of
October 15, 2002, by and among:

          (1) QUEST DIAGNOSTICS RECEIVABLES INC., a Delaware corporation (the
     "Borrower"),

          (2) QUEST DIAGNOSTICS INCORPORATED, a Delaware corporation ("Quest
     Diagnostics") as initial servicer (together with the Borrower, the "Loan
     Parties"),

          (3) QUEST DIAGNOSTICS INCORPORATED, a Michigan corporation, QUEST
     DIAGNOSTICS INCORPORATED, a Maryland corporation, QUEST DIAGNOSTICS
     INCORPORATED, a California corporation, QUEST DIAGNOSTICS LLC, a
     Connecticut limited liability company, QUEST DIAGNOSTICS LLC, a
     Massachusetts limited liability company, QUEST DIAGNOSTICS OF PENNSYLVANIA
     INCORPORATED, a Delaware corporation, METWEST INC., a Delaware corporation,
     QUEST DIAGNOSTICS LLC, an Illinois limited liability company, QUEST
     DIAGNOSTICS CLINICAL LABORATORIES, INC., a Delaware corporation, QUEST
     DIAGNOSTICS LLC, a Massachusetts limited liability company, and QUEST
     DIAGNOSTICS LLC, a Connecticut limited liability company (all of the
     foregoing, together with Quest Diagnostics, collectively, the "Originators"
     and together with the Loan Parties, the "Companies"),

          (4) BLUE RIDGE ASSET FUNDING CORPORATION, a Delaware corporation
     ("Blue Ridge"), and WACHOVIA BANK, NATIONAL ASSOCIATION, in its capacity as
     a Liquidity Bank to Blue Ridge (collectively, the "Blue Ridge Group"),

          (5) LA FAYETTE ASSET SECURITIZATION LLC, a Delaware limited liability
     company (together with its successors, "La Fayette"), and CREDIT LYONNAIS
     NEW YORK BRANCH, in its capacity as a Liquidity Bank to La Fayette
     (collectively, the "La Fayette Group"),

          (6) WACHOVIA BANK, NATIONAL ASSOCIATION, in its capacity as agent for
     the Blue Ridge Group, and CREDIT LYONNAIS NEW YORK BRANCH, in its capacity
     as agent for the La Fayette Group (in such latter capacity, together with
     its successors in such latter capacity, the "La Fayette Agent" or a
     "Co-Agent"), and

          (7) WACHOVIA BANK, NATIONAL ASSOCIATION, as administrative agent for
     the Blue Ridge Group, the Blue Ridge Agent, the La Fayette Group and the La
     Fayette Agent (in such capacity, together with any successors thereto in
     such capacity, the "Administrative Agent" and together with each of the
     Co-Agents, the "Agents"),





with respect to (a) that certain Receivables Sale Agreement, dated as of July
21, 2000, by and between the Originators, as sellers, and the Borrower, as
purchaser (as heretofore amended or supplemented from time to time, the
"Existing RSA"), and (b) that certain Amended and Restated Credit and Security
Agreement dated as of September 28, 2001, by and among the Borrower, Quest
Diagnostics, as initial Servicer, the Blue Ridge Group, the La Fayette Group and
the Agents (as heretofore amended, the "Existing CSA" and, together with the
Existing RSA, the "Existing Agreements"). The Existing Agreements as amended
hereby are sometimes hereinafter collectively referred to as the "Agreements."

          Unless otherwise indicated, capitalized terms used in this Amendment
are used with the meanings attributed thereto in the Existing CSA or Existing
RSA, as applicable.

                              W I T N E S S E T H :

          WHEREAS, the parties wish to modify the Existing RSA and Existing CSA
     to expand the definitions of "Receivable" contained therein as hereinafter
     set forth;

          NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein contained, the parties hereto hereby agree as follows:

          1. Amendments to of Existing Agreements. Subject to the terms and
conditions hereinafter set forth, the parties hereby agree as follows:

          1.1. The definition of "Receivable" in the Existing RSA is hereby
amended and restated in its entirety to read as follows:

          "Receivable" means any Account arising from the sale of Clinical
     Laboratory Services by a Seller, including, without limitation, the right
     to payment of any interest or finance charges and other amounts with
     respect thereto; provided, however, that the term "Receivable" shall not
     include (a) any Excluded JV Receivable, or (b) any Government Receivable
     except a Specified Government Receivable. Rights to payment arising from
     any one transaction, including, without limitation, rights to payment
     represented by an individual invoice, shall constitute a Receivable
     separate from a Receivable consisting of the rights to payment arising from
     any other transaction.

          1.2. The following definitions in the Existing CSA are hereby amended
and restated in their entirety to read, respectively, as follows:

          "Net Pool Balance" means, at any time, an amount equal to (i) Net
     Receivables, minus (ii) Specified Government Ineligibles.

          "Receivable" means any Account arising from the sale of Clinical
     Laboratory Services by an Originator, including, without limitation, the
     right to payment of any interest or finance charges and other amounts with
     respect thereto, which is sold or contributed to the Borrower under the
     Sale Agreement; provided, however, that the term "Receivable" shall not
     include (a) any Excluded JV Receivable, or (b) any Government Receivable
     except a Specified


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     Government Receivable. Rights to payment arising from any one transaction,
     including, without limitation, rights to payment represented by an
     individual invoice, shall constitute a Receivable separate from a
     Receivable consisting of the rights to payment arising from any other
     transaction.

          "Regulatory Change" shall mean any change after the date of this
     Agreement in United States (federal, state or municipal) or foreign laws,
     regulations (including Regulation D) or accounting principles or the
     adoption or making after such date of any interpretations, directives or
     requests applying to a class of banks (including the Liquidity Banks) of or
     under any United States (federal, state or municipal) or foreign laws,
     regulations (whether or not having the force of law) or accounting
     principles by any court, governmental or monetary authority, or accounting
     board or authority (whether or not part of government) charged with the
     establishment, interpretation or administration thereof. For the avoidance
     of doubt, any interpretation of Accounting Research Bulletin No. 51 by the
     Financial Accounting Standards Board shall constitute a Regulatory Change.

          1.3. Each of the Existing Agreements is hereby amended to add the
following new term in its appropriate alphabetical order:

          "Specified Government Receivable" means a Government Receivable as to
     which the Obligor is a state or local Governmental Authority (other than a
     Receivable arising under any state's Medicaid statutes and regulations, for
     services rendered to eligible beneficiaries thereunder).

          1.4. The Existing CSA is hereby amended to add the following new terms
in their appropriate alphabetical order:

          "Client-Billed Receivable" means a Receivable booked in the
     "client-billed receivables" category of accounts receivable in the billing
     and accounting process of the applicable Originator owing from a physician,
     hospital or other institutional Obligor (including a Governmental Authority
     or affiliated Obligor) which is billed monthly in arrears for the services
     provided with pricing typically based on a negotiated fee schedule. For the
     avoidance of doubt, no Client-Billed Receivable would be (a) a "Government
     Receivable" of the type described in clause (i), (ii) or (iii) of the
     definition of such term, or (b) owing from another payor type such as an
     individual "self-pay" patient or an insurance company or managed care plan.

          "Client-Billed Receivables for the Reserve Computation" means, at any
     time, an amount determined by multiplying the Client-Billed Receivables
     Percentage by Net Receivables.

          "Client-Billed Receivables Percentage" means, at any time, the
     percentage equal to (a) the Unpaid Net Balance of all Client-Billed
     Receivables, divided by (b) the Unpaid Net Balance of all Receivables, in
     each of the foregoing cases, determined as of the last day of the calendar
     month then most recently ended.


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          "Net Receivables" means, at any time, an amount equal to the aggregate
     Unpaid Net Balance of all Receivables at such time, minus (i) the aggregate
     Unpaid Net Balance of all Receivables that are not Eligible Receivables at
     such time, minus (ii) Receivables (other than those covered by any other
     clause of this definition) that are not yet Delinquent Receivables or
     Defaulted Receivables which are owing from any Top 10 Obligor as to which
     more than 50% of the aggregate Unpaid Net Balance of all Receivables owing
     from such Top 10 Obligor are Defaulted Receivables, minus (iii) the Excess
     Concentration Amount at such time, minus (iv) 5% of the aggregate Unpaid
     Net Balance of all Receivables owing from Obligors who are not Top 10
     Obligors.

          "Specified Government Ineligibles" means, on any date of
     determination, 27% times Client-Billed Receivables for the Reserve
     Computation as of the last day of the calendar month then most recently
     ended.

          "Top 10 Obligor" means any of the following and its Affiliates
     considered as if it and its Affiliates were one and the same entity: (1)
     United Healthcare, (2) Aetna / US Healthcare / Prudential, (3) Cigna, (4)
     Independence Blue Cross / Amerihealth, (5) Private Health Care Systems
     (PHCS), (6) Beech Street, (7) Humana, (8) Anthem Health, (9) Empire BCBS,
     and (10) BCBS Mass.

          1.5. Clause (m) of the definition of "Eligible Receivable" in the
Existing CSA is hereby amended and restated in its entirety to read as follows:

          (m) [intentionally omitted];

          1.6. Each of the Existing Agreements is hereby amended to add the
following new representation to Section 2.1 of the Existing RSA and to Section
5.1 of the Existing CSA:

          (z) Specified Government Receivables. All Specified Government
     Receivables are recorded in the Originators' billing and accounting systems
     solely as Client-Billed Receivables.

          1.7. Section 4.1(c) of the Existing RSA is hereby amended to add the
following sentence at the end thereof:

          In addition to the foregoing, such Seller shall be responsible for the
     costs and expenses of one additional Review during the period beginning on
     October 15, 2002 and ending on January 31, 2003 for purposes of auditing
     the Specified Government Receivables and the cross-aging of Receivables
     owing from the Top 10 Obligors.

          1.8. Section 7.1(c) of the Existing CSA is hereby amended to add the
following sentence at the end thereof:

          In addition to the foregoing, the Loan Parties shall be responsible
     for the costs and expenses of one additional Review during the period
     beginning on October 1, 2002 and ending on January 31, 2003 for purpose of
     auditing the


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     Specified Government Receivables and the cross-aging of Receivables owing
     from the Top 10 Obligors.

          1.9. Section 7.1(C) of the Existing RSA is hereby amended and restated
in its entirety to read as follows:

          (C) the failure by such Seller to comply with any applicable law, rule
     or regulation with respect to any of its Receivables or the related
     Contracts or Invoices, including, without limitation, any state or local
     assignment of claims act or similar legislation prohibiting or imposing
     notice and acknowledgement requirements or other limitations or conditions
     on the assignment of a Specified Government Receivable, or the
     nonconformity of any of such Seller's Receivables or the related Contracts
     or Invoices with any such applicable law, rule or regulation;

          1.10. Section 13.1(a)(C) of the Existing CSA is hereby amended and
restated in its entirety to read as follows:

          (C) the failure by any Loan Party to comply with any applicable law,
     rule or regulation with respect to any Receivable or the related Contract
     and/or Invoice, including, without limitation, any state or local
     assignment of claims act or similar legislation prohibiting or imposing
     notice and acknowledgement requirements or other limitations or conditions
     on the assignment of a Specified Government Receivable, or the
     nonconformity of any Receivable or the related Contract and/or Invoice with
     any such applicable law, rule or regulation;

          2. Representations.

          2.1. Each of the Companies represents and warrants to the Lenders and
the Agents that it has duly authorized, executed and delivered this Amendment
and that the Agreement constitutes, a legal, valid and binding obligation of
such Company, enforceable in accordance with its terms (except as enforceability
may be limited by applicable bankruptcy, insolvency, or similar laws affecting
the enforcement of creditors' rights generally or by equitable principles
relating to enforceability).

          2.2. Each of the Originators further represents and warrants to the
Borrower, the Lenders and the Agents that, after giving effect to this Amendment
and the filing of the financing statement amendments contemplated by Section 3
below, each of its representations and warranties set forth in Section 2.1 of
the Existing RSA is true and correct as of the date hereof.

          2.3. Each of the Loan Parties further represents and warrants to the
Lenders and the Agents that, after giving effect to this Amendment and the
filing of the financing statement amendments contemplated by Section 3 below,
each of its representations and warranties set forth in Section 6.1 of the
Existing CSA is true and correct as of the date hereof and that no Event of
Default or Unmatured Default exists as of the date hereof and is continuing.


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          3. Condition Precedent. This Amendment shall become effective as of
the date first above written upon receipt by the Administrative Agent of a
counterpart hereof duly executed by each of the parties hereto.

          4. Miscellaneous.

          4.1. Except as expressly amended hereby, the Existing Agreements shall
remain unaltered and in full force and effect, and each of the parties hereby
ratifies and confirms each of the Transaction Documents to which it is a party.

          4.2. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK WITHOUT REFERENCE TO PRINCIPLES
OF CONFLICTS OF LAW.

          4.3. EACH OF THE COMPANIES HEREBY ACKNOWLEDGES AND AGREES THAT:

          4.3.1. IT IRREVOCABLY (i) SUBMITS TO THE NON-EXCLUSIVE JURISDICTION,
FIRST, OF ANY UNITED STATES FEDERAL COURT, AND SECOND, IF FEDERAL JURISDICTION
IS NOT AVAILABLE, OF ANY NEW YORK STATE COURT, IN EITHER CASE SITTING IN NEW
YORK COUNTY, NEW YORK, IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO
THE AGREEMENTS, AND (ii) WAIVES, TO THE FULLEST EXTENT IT MAY EFFECTIVELY DO SO,
THE DEFENSE OF AN INCONVENIENT FORUM TO THE MAINTENANCE OF AN ACTION OR
PROCEEDING IN SUCH COURTS.

          4.3.2. TO THE EXTENT THAT IT HAS OR HEREAFTER MAY ACQUIRE ANY IMMUNITY
FROM THE JURISDICTION OF ANY COURT OR FROM ANY LEGAL PROCESS (WHETHER THROUGH
SERVICE OR NOTICE, ATTACHMENT PRIOR TO JUDGMENT, ATTACHMENT IN AID TO EXECUTION,
EXECUTION OR OTHERWISE) WITH RESPECT TO ITSELF OR ITS PROPERTY, IT HEREBY
IRREVOCABLY WAIVES SUCH IMMUNITY IN RESPECT OF ITS OBLIGATIONS UNDER OR IN
CONNECTION WITH THE EXISTING AGREEMENT (OR EXISTING AGREEMENTS) TO WHICH IT IS A
PARTY.

          4.4. This Amendment may be executed in any number of counterparts and
by the different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which when taken together
shall constitute one and the same Amendment.

          4.5. The Administrative Agent is hereby authorized to prepare and file
amendments to all financing statements filed in the jurisdiction of organization
of each of the Companies in connection with the Existing RSA and/or Existing CSA
revising the definition of "Receivable" contained therein in a manner consistent
with the applicable amendment contained in Section 1 hereof.

                            (Signature pages follow)


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          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date first above written.

                                WACHOVIA BANK, NATIONAL ASSOCIATION,
                                INDIVIDUALLY, AS ADMINISTRATIVE AGENT AND AS
                                BLUE RIDGE AGENT


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                BLUE RIDGE ASSET FUNDING CORPORATION


                                BY: WACHOVIA BANK, NATIONAL ASSOCIATION, ITS
                                    ATTORNEY-IN-FACT


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:

                                       7





                                LA FAYETTE ASSET SECURITIZATION LLC


                                BY: LA FAYETTE MEMBER, INC., AS ITS SOLE MEMBER


                                By:
                                    --------------------------------------------
                                    Name:  Konstantina Kourmpetis
                                    Title: Director


                                CREDIT LYONNAIS NEW YORK BRANCH, INDIVIDUALLY
                                AND AS LA FAYETTE AGENT


                                By:
                                    --------------------------------------------
                                    Name:  Konstantina Kourmpetis
                                    Title: Director


                                       8





                                QUEST DIAGNOSTICS RECEIVABLES INC.


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS INCORPORATED


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS INCORPORATED, A MICHIGAN
                                CORPORATION


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS INCORPORATED, A MARYLAND
                                CORPORATION


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                       9





                                QUEST DIAGNOSTICS INCORPORATED, A CALIFORNIA
                                CORPORATION


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS LLC, A CONNECTICUT LIMITED
                                LIABILITY COMPANY


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS LLC, A MASSACHUSETTS LIMITED
                                LIABILITY COMPANY


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS OF PENNSYLVANIA INCORPORATED,
                                A DELAWARE CORPORATION


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                       10





                                QUEST DIAGNOSTICS LLC, AN ILLINOIS LIMITED
                                LIABILITY COMPANY


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                METWEST INC., A DELAWARE CORPORATION


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS CLINICAL LABORATORIES, INC.,
                                A DELAWARE CORPORATION


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS LLC, A MASSACHUSETTS LIMITED
                                LIABILITY COMPANY


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


                                QUEST DIAGNOSTICS LLC, A CONNECTICUT LIMITED
                                LIABILITY COMPANY


                                By:
                                    --------------------------------------------
                                    Name:
                                    Title:


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