Exhibit 12.1

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

		FOR THE NINE MONTHS ENDED	YEAR ENDED DECEMBER 31,
		SEPTEMBER 30, 2005		2004		2003		2002		2001		2000
Income before taxes, equity earnings and minority share of income	$	689,838	$	833,120	$	737,555	$	539,177	$	330,720	$	204,002
Adjustments:
Distributed income from less than 50% owned companies		18,263		21,973		13,881		17,034		3,620		2,952
Fixed charges		74,522		104,316		100,911		89,567		105,154		145,721
Earnings before taxes and fixed charges, as adjusted	$	782,623	$	959,409	$	852,347	$	645,778	$	439,494	$	352,675
Fixed charges:
Interest expense	$	40,644	$	60,464	$	61,064	$	57,707	$	77,840	$	120,471
Portion of rent expense which represents interest factor		33,878		43,852		39,847		31,860		27,314		25,250
Total fixed charges	$	74,522	$	104,316	$	100,911	$	89,567	$	105,154	$	145,721
Ratio of earnings to fixed charges		10.5x		9.2x		8.4x		7.2x		4.2x		2.4x