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Laboratory and Office Locations Around the World

Quest Diagnostics has headquarters in the U.S. and operations in India, Ireland, Mexico, and the United Kingdom. Our products and services are used by customers in over 130 countries. We also collaborate with many international diagnostic laboratories, hospitals and clinics to help improve human health around the world.

United States

We offer broad access to clinical testing services through our national network of laboratories in most major metropolitan areas as well as approximately 2,000 patient locations. Make an appointment at a patient location. Read more about our products and services.

India

Through our state-of-the-art laboratory facility in Gurgaon, we provide a range of products and services to physicians, hospitals, life insurance companies and pharmaceutical/biotech companies in India.

Ireland

In 2006, the Ireland national health administration engaged with us to help reduce a critical backlog of Pap-based cervical cancer screening tests. Since then, Quest Diagnostics has helped to improve the delivery of timely results for patients and expanded its service offering in Ireland.

Mexico

With two central labs accredited by the College of American Pathologists (CAP) and approximately 35 patient locations, Quest Diagnostics Mexico is one of the preeminent private clinical laboratories in Mexico City and Ciudad Juarez. We offer domestic and international testing services, including clinical trials, drug screening, life insurance assessments and specialized, complex testing. More about our business in Mexico (in Spanish). 

United Kingdom

We are one of the largest independent diagnostic service providers. Our main facility, located near Heathrow airport, offers a comprehensive testing menu that services the clinical trials industry. We work with both private and public laboratories. Read more

Clinical Trials - In-house and Affiliate Laboratory Management

We operate in-house laboratories in the United States and United Kingdom, complemented by alliance laboratories in Australia, China, Singapore, and South America. Read more

Patient Locations

Choose from approximately 2,000 patient locations across the U.S. Find a location convenient for you – you can even make an appointment.

Licenses & Accreditations

Read more about our CLIA (Clinical Laboratory Improvement Amendments) licenses and CAP (College of American Pathologists) accreditation. CAP programs are aligned with international standards.

Lab Contact Info

Looking for an address or phone number for a laboratory facility? Click here.

Headquarters

Our corporate headquarters are in New Jersey, about 30 miles west of New York City. Administrative offices are also in Lyndhurst, NJ and Collegeville, PA (near Philadelphia).

3 Giralda Farms
Madison, NJ 07940
1-800-222-0446