Founded in 1967 and is headquartered in Madison, New Jersey, Quest Diagnostics Incorporated (NYSE: DGX) provides diagnostic testing, information, and services in the United States and internationally. In addition, Quest Diagnostics provides central laboratory testing services in connection with clinical research trials on new drugs, vaccines, and medical devices; and clinical testing to employers for the detection of employee use of drugs-of-abuse.

Quest Diagnostics, the world's leading provider of diagnostic testing, information and services, yesterday announced that the U.S. Food and Drug Administration (FDA) has granted a de novo classification petition to its STRATIFY JCV? Antibody ELISA testing service. STRATIFY JCV is the first blood test to be FDA market authorized for the qualitative detection of antibodies to the polyomavirus JC virus (JCV) for stratifying risk for progressive multifocal leukoencephalopathy (PML), an infrequent but serious brain infection, in patients with multiple sclerosis (MS) receiving TYSABRI® (natalizumab), a highly effective therapy for relapsing forms of MS.

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