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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1022079	Quest Diagnostics Inc	DGX	Services-Medical Laboratories (8071)	161387862

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1410233	Elizabeth Joan Miller	C/O Quest Diagnostics Incorporated 3 Giralda Farms Madison NJ 07940	Svp-Oncology & Neurology Srvcs	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-05-18	21,112	$47.49	117,773	No	4	M	Direct
Common Stock	Disposition	2011-05-18	11,112	$58.00	106,661	No	4	S	Direct
Common Stock	Disposition	2011-05-18	10,000	$58.20	96,661	No	4	S	Direct
Common Stock	Disposition	2011-05-17	1,809	$57.93	1,039	No	4	S	Indirect	401(k)/SDCP

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Indirect	401(k)/SDCP

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Options (Right to Buy)	Disposition	2011-05-18	21,112	$0.00	21,112	$47.49

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2015-03-04	No	4	M	Direct

Footnotes

The options vested in three installments beginning with the first on March 4, 2009, the second on March 4, 2010 and the final on March 4, 2011.
The number of shares reported as sold in the Supplemental Deferred Compensation Plan ("SDCP") is based on the account balance of the Company stock fund under the SDCP (which includes some money market instruments) as of May 17, 2011.
This transaction was executed in multiple trades at prices ranging from $58.20 to $58.23. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
The amount includes exempt purchases made under the Company's stock purchase plan.
These underlying shares were acquired on a periodic basis by the trustees of the Company's Profit Sharing (401(k)) and Supplemental Deferred Compensation Plans. The information was obtained from the plan administrators as of a recent date. The number of shares is based on the account balance of the Company's stock fund under the Plans (which include some money market instruments), divided by the market price of the Company's stock as of that date.