Exhibit 12.1

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

	YEAR ENDED DECEMBER 31,
	2010		2009		2008		2007		2006
Income from continuing operations before taxes, equity earnings and net income attributable to non-controlling interests	$	1,154,276	$	1,194,240	$	1,020,613	$	912,380	$	1,028,161
Adjustments:
Distributed income from less than 50% owned companies		30,883		25,345		28,752		24,972		26,411
Fixed charges		212,543		209,379		248,716		243,317		147,133
Earnings from continuing operations before taxes and fixed charges, as adjusted	$	1,397,702	$	1,428,964	$	1,298,081	$	1,180,669	$	1,201,705
Fixed charges:
Interest expense	$	148,004	$	147,071	$	185,783	$	186,957	$	96,997
Portion of rent expense which represents interest factor		64,539		62,308		62,933		56,360		50,136
Total fixed charges	$	212,543	$	209,379	$	248,716	$	243,317	$	147,133
Ratio of earnings to fixed charges		6.6x		6.8x		5.2x		4.9x		8.2x

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