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