Exhibit 12.1

QUEST DIAGNOSTICS INCORPORATED
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
(DOLLARS IN THOUSANDS, EXCEPT RATIOS)

	For The Three Months Ended March 31,			Year Ended December 31,
	2007			2006			2005			2004			2003			2002
Income from continuing operations before taxes, equity earnings and minority share of income		$	176,273		$	1,028,161		$	941,498		$	822,880		$	725,920		$	531,469
Adjustments:
Distributed income from less than 50% owned companies			5,300			26,411			25,492			21,973			13,881			17,034
Fixed charges			41,428			147,133			108,751			103,725			100,312			88,997
Earnings from continuing operations before taxes and fixed charges, as adjusted		$	223,001		$	1,201,705		$	1,075,741		$	948,578		$	840,113		$	637,500
Fixed charges:
Interest expense		$	28,168		$	96,997		$	63,266		$	60,464		$	61,064		$	57,707
Portion of rent expense which represents interest factor			13,260			50,136			45,485			43,261			39,248			31,290
Total fixed charges		$	41,428		$	147,133		$	108,751		$	103,725		$	100,312		$	88,997
Ratio of earnings to fixed charges			5.4x			8.2x			9.9x			9.2x			8.4x			7.2x