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 *
BONGIORNO THOMAS F
   2. Issuer Name and Ticker or Trading Symbol
QUEST DIAGNOSTICS INC [DGX] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Controller
(Last)
(First)
(Middle)
3. Date of Earliest Transaction (Month/Day/Year)
08/10/2005
(Street)

 		 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 08/10/2005   I   2,608 A $ 50.2 2,840 (2) I 401(k) Plan
Common Stock 08/11/2005   M   30,000 A $ 17.58 31,003 (1) D  
Common Stock 08/11/2005   F   784 D $ 50.56 30,219 D  
Common Stock 08/11/2005   S   675 D $ 50.7 29,544 D  
Common Stock 08/11/2005   S   495 D $ 50.45 29,049 D  
Common Stock 08/11/2005   S   300 D $ 50.44 28,749 D  
Common Stock 08/11/2005   S   27,745 D $ 50.18 1,004 D  
Common Stock 08/12/2005   P   2,200 A $ 50.64 (3) 2,200 I By IRA

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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) $ 17.58 08/11/2005   M     30,000 06/26/2001 06/26/2010 Common Stock 30,000 $ 0 18,000 D  
Stock Options (right to buy) $ 50.56 08/11/2005   A   784   08/11/2006 06/26/2010 Common Stock 784 $ 0 784 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
BONGIORNO THOMAS F

 		       Controller  

Signatures

 Leo C. Farrenkopf, Jr., Atty. in Fact for Thomas F. Bongiorno   08/12/2005
**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) This amount includes exempt purchases made under the Company's stock purchase plan since the date of the last filing on Form 4.
(2) The information was obtained from the administrator of the Company's tax qualified Profit Sharing (401(k)) plan as of 8/10/2005. The number of shares is based on the account balance of the Company stock fund under the plan (which includes some money market instruments) divided by the market price of the Company's stock as of that date. On June 20, 2005, the Company effected a 2-for-1 stock split of its Common Stock in the form of a 100% stock dividend. All prior holdings, including stock options, have been adjusted to reflect the stock split.
(3) Includes commissions. The net purchase price exceeded the net sale price on all sale transactions effected on 8/11/2005.

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