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Sonora Quest Laboratories, an independently run joint venture between Banner Health and Quest, is the nation’s largest integrated laboratory system with approximately 3,200 employees serving more than 28,000 patients every day throughout Arizona. They are the market share leader in clinical laboratory testing in Arizona, performing nearly 85 million diagnostic tests per year. They offer a local comprehensive test menu which encompasses routine, molecular, prescription drug monitoring, genetics/genomics, and pathology testing services. Ninety-five percent of all testing is performed at their primary testing facilities located in Phoenix, Tucson, Flagstaff, Prescott, and Yuma.