Quest Diagnostics Locations Location search Location search Quest Diagnostics has headquarters in the U.S. and operations in India, Ireland, and Mexico. Our products and services are used by customers in over 130 countries. We also collaborate with many international diagnostic laboratories, hospitals ...
Do I need to fast before being tested at a Quest Diagnostics location? I'm blind or visually impaired; how can I check in to my appointment?Make or change an appointment It's easy to schedule or reschedule lab tests for the time and place that's most convenient for you. Book now Cl...