As of 2015, patients can find locations of Quest Medical Labs online at Questdiagnostics.com under the "Find a Location" tab. Customer service representatives for the company can also provide lab locations at 1-866-MYQUEST.
Quest Diagnostics operates more than 2,200 patient service centers and lab locations in the United States as of 2015, according to the company's official website. The company serves approximately half of all hospitals and physicians in the United States and employs more than 41,000 employees. Lab information is forwarded electronically to medical personnel, and patients can enroll in mobile and online services to access health information and test results.