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 *
GRANT WILLIAM R
   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)
02/23/2007
(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 02/23/2007   M   10,531 A $ 29.5262 13,865 (1) (2) D  
Common Stock 02/23/2007   M   440 A $ 29.72 14,305 (1) (2) D  
Common Stock 02/23/2007   M   362 A $ 30.03 14,667 (1) (2) D  
Common Stock 02/23/2007   M   482 A $ 30.285 15,149 (1) (2) D  
Common Stock 02/23/2007   M   20,000 A $ 30.455 35,149 (1) (2) D  
Common Stock 02/23/2007   M   766 A $ 30.525 35,915 (1) (2) D  
Common Stock 02/23/2007   M   350 A $ 31.055 36,265 (1) (2) D  
Common Stock 02/23/2007   M   816 A $ 31.72 37,081 (1) (2) D  
Common Stock 02/23/2007   M   312 A $ 34.72 37,393 (1) (2) D  
Common Stock 02/23/2007   M   304 A $ 35.6925 37,697 (1) (2) D  
Common Stock 02/23/2007   M   638 A $ 36.595 38,335 (1) (2) D  
Common Stock 02/23/2007   M   292 A $ 37.2625 38,627 (1) (2) D  
Common Stock 02/23/2007   M   264 A $ 41.205 38,891 (1) (2) D  
Common Stock 02/23/2007   M   552 A $ 41.32 39,443 (1) (2) D  
Common Stock 02/23/2007   M   262 A $ 41.345 39,705 (1) (2) D  
Common Stock 02/23/2007   M   826 A $ 42.415 40,531 (1) (2) D  
Common Stock 02/23/2007   M   13,333 A $ 42.625 53,864 (1) (2) D  
Common Stock 02/23/2007   M   698 A $ 44.185 54,562 (1) (2) D  
Common Stock 02/23/2007   M   20,000 A $ 47.465 74,562 (1) (2) D  
Common Stock 02/23/2007   M   952 A $ 47.9375 75,514 (1) (2) D  
Common Stock 02/23/2007   M   958 A $ 50.655 76,472 (1) (2) D  
Common Stock 02/23/2007   M   985 A $ 51.46 77,457 (1) (2) D  
Common Stock 02/23/2007   M   877 A $ 51.565 78,334 (1) (2) D  
Common Stock 02/23/2007   S   75,000 D $ 52.3618 3,334 (1) (2) D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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) $ 29.5262 02/23/2007   M     10,531 05/08/2002 05/08/2011 Common Stock 10,531 $ 29.5262 9,469 D  
Stock Options (Right to buy) $ 29.72 02/23/2007   M     440 10/01/2000 10/01/2010 Common Stock 440 $ 29.72 0 D  
Stock Options (Right to buy) $ 30.03 02/23/2007   M     362 10/01/2001 10/01/2011 Common Stock 362 $ 30.03 0 D  
Stock Options (Right to buy) $ 30.285 02/23/2007   M     482 04/01/2003 04/01/2013 Common Stock 482 $ 30.282 0 D  
Stock Options (Right to buy) $ 30.455 02/23/2007   M     20,000 05/13/2004 05/13/2013 Common Stock 20,000 $ 30.455 0 D  
Stock Options (Right to buy) $ 30.525 02/23/2007   M     766 10/01/2003 10/01/2013 Common Stock 766 $ 30.525 0 D  
Stock Options (Right to buy) $ 31.055 02/23/2007   M     350 10/01/2002 10/01/2012 Common Stock 350 $ 31.055 0 D  
Stock Options (Right to buy) $ 31.72 02/23/2007   M     816 07/01/2003 07/01/2013 Common Stock 816 $ 31.72 0 D  
Stock Options (Right to buy) $ 34.72 02/23/2007   M     312 01/01/2002 01/01/2011 Common Stock 312 $ 34.72 0 D  
Stock Options (Right to buy) $ 35.6925 02/23/2007   M     304 01/01/2002 01/01/2012 Common Stock 304 $ 35.6925 0 D  
Stock Options (Right to buy) $ 36.595 02/23/2007   M     638 01/01/2004 01/01/2014 Common Stock 638 $ 36.595 0 D  
Stock Options (Right to buy) $ 37.2625 02/23/2007   M     292 06/29/2002 06/29/2011 Common Stock 292 $ 37.2625 0 D  
Stock Options (Right to buy) $ 41.205 02/23/2007   M     264 07/01/2002 07/01/2012 Common Stock 264 $ 41.205 0 D  
Stock Options (Right to buy) $ 41.32 02/23/2007   M     552 04/01/2004 04/01/2014 Common Stock 552 $ 41.32 0 D  
Stock Options (Right to buy) $ 41.345 02/23/2007   M     262 04/01/2002 04/01/2012 Common Stock 262 $ 41.345 0 D  
Stock Options (Right to buy) $ 42.415 02/23/2007   M     826 07/01/2004 07/01/2014 Common Stock 826 $ 42.415 0 D  
Stock Options (Right to buy) $ 42.625 02/23/2007   M     13,333 05/04/2005 05/04/2014 Common Stock 13,333 $ 42.625 6,667 D  
Stock Options (Right to buy) $ 44.185 02/23/2007   M     698 10/01/2004 10/01/2014 Common Stock 698 $ 44.185 0 D  
Stock Options (Right to buy) $ 47.465 02/23/2007   M     20,000 05/07/2003 05/07/2012 Common Stock 20,000 $ 47.465 0 D  
Stock Options (Right to buy) $ 47.9375 02/23/2007   M     952 01/01/2005 01/01/2015 Common Stock 952 $ 47.9375 0 D  
Stock Options (Right to buy) $ 50.655 02/23/2007   M     958 10/01/2005 10/01/2012 Common Stock 958 $ 50.655 0 D  
Stock Options (Right to buy) $ 51.565 02/23/2007   M     877 01/01/2006 01/01/2013 Common Stock 877 $ 51.565 0 (3) D  

Reporting Owners

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

Signatures

 Leo C. Farrenkopf. Jr., atty-in-fact for William R. Grant   02/27/2007
**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) The sale price of these shares represents an average sales price.
(2) Reporting Person will retire as a Director of Quest Diagnostics on May 8, 2007, when his current term expires.
(3) Additional transaction: 2/23/07 - M (stock option exercise) 985 shares at $51.46. Exercisable: 4-1-2006; termination date - 4-1-2013.

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