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,
		2010			2009			2008			2007			2006			2005
Income from continuing
operations before taxes,
equity earnings and net
income attributable to non-
controlling interests	$	894,659		$	1,194,240		$	1,020,613		$	912,380		$	1,028,161		$	941,498
Adjustments:
Distributed income from less
than 50% owned companies		15,889			25,345			28,752			24,972			26,411			25,492
Fixed charges		158,101			209,379			248,716			243,317			147,133			108,751
Earnings from continuing
operations before taxes and
fixed charges, as adjusted	$	1,068,649		$	1,428,964		$	1,298,081		$	1,180,669		$	1,201,705		$	1,075,741
Fixed charges:
Interest expense	$	109,826		$	147,071		$	185,783		$	186,957		$	96,997		$	63,266
Portion of rent expense which
represents interest factor		48,275			62,308			62,933			56,360			50,136			45,485
Total fixed charges	$	158,101		$	209,379		$	248,716		$	243,317		$	147,133		$	108,751
Ratio of earnings to fixed
charges		6.8	x		6.8	x		5.2	x		4.9	x		8.2	x		9.9	x