When physicians were asked which of the two largest national laboratories they preferred for their patients, those with a preference overwhelmingly chose Quest Diagnostics over Laboratory Corporation of America Holdings (LabCorp).*

They also rated Quest Diagnostics higher than LabCorp in critical areas of quality and service.

"The magnitude of the preference for Quest Diagnostics in the survey is very impressive. So often, market researchers can detect only the subtlest of differentiation between major brands in a marketplace," said Susan Schwartz McDonald, Ph.D., CEO of National Analysts, which conducted the survey on behalf of Quest Diagnostics in January, 2007. "Seldom do we see the kind of consistent, significant, and vivid differentiation displayed in these data. It's apparent that many physicians have a lot of conviction about Quest Diagnostics, and that conviction is based on a broad-ranging assessment of Quest's performance."

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*The physicians surveyed were general and family practitioners, internists, obstetricians and gynecologists.