As of 2015, the number to call to make an appointment at Quest Diagnostics is 866-697-8378, according to the company's website. After the call is answered, choose option 2 to make an appointment.
Information regarding other matters, such as billing and lab locations, is provided by following the appropriate prompts at the above-referenced number, as specified by the company website. Appointment scheduling requests and other questions can be submitted online by completing the contact form at Questdiagnostics.com. Appointments can be cancelled, changed or confirmed online, as can completing post-appointment surveys. The contact us page also has details on its three Nichols Institutes.