3 Giralda Farms
Madison, NJ, 07940 United States
#375 in FORTUNE 500 (June 2015)
Quest Diagnostics is testing its ability to be the world's leading clinical lab. The company performs diagnostics on some 156 million specimens each year, including routine clinical tests such as cholesterol checks, Pap smears, and HIV screenings. Quest Diagnostics also performs esoteric testing (such as genetic screening) and anatomic pathology testing (such as tissue biopsies for cancer testing). In all, the company serves half of the physicians and hospitals in the US as well as government agencies and other clinical labs. Quest Diagnostics has more than 2,200 patient service centers where samples are collected, and the Quest Diagnostic Nichols Institute where new diagnostics are developed.