Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
ZIEGLER JOHN B
  2. Issuer Name and Ticker or Trading Symbol
QUEST DIAGNOSTICS INC [DGX]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O QUEST DIAGNOSTICS INCORPORATED, 1290 WALL STREET WEST
3. Date of Earliest Transaction (Month/Day/Year)
05/09/2007
(Street)

LYNDHURST, NJ 07071
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 05/09/2007   M   436 A $ 9.58 10,047 (1) D  
Common Stock 05/09/2007   M   732 A $ 17.82 10,779 (1) D  
Common Stock 05/09/2007   M   484 A $ 22.38 11,263 (1) D  
Common Stock 05/09/2007   M   440 A $ 29.72 11,703 (1) D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options (Right to buy) $ 9.58 05/09/2007   M     436 04/01/2001 04/01/2010 Common Stock 436 $ 0 0 D  
Stock Options (Right to buy) $ 17.82 05/09/2007   M     732 06/30/2001 06/30/2010 Common Stock 732 $ 0 0 D  
Stock Options (Right to buy) $ 22.38 05/09/2007   M     484 03/30/2002 03/30/2011 Common Stock 484 $ 0 0 D  
Stock Options (Right to buy) $ 29.72 05/09/2007   M     440 10/01/2000 10/01/2010 Common Stock 440 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
ZIEGLER JOHN B
C/O QUEST DIAGNOSTICS INCORPORATED
1290 WALL STREET WEST
LYNDHURST, NJ 07071
  X      

Signatures

 Leo C. Farrenkopf, Jr., atty-in-fact for John B. Ziegler   05/10/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Certain of these shares are subject to restrictions on transfer and/or certain other terms contained in the underlying stock agreements and related plan document.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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