Skip to main content
Quest Diagnostics

Laboratory and Office Locations Around the World

Quest Diagnostics has headquarters in the US and operations in India, Ireland, and Mexico. Our products and services are used by customers on 6 continents. 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.

Brazil

To serve the Brazilian market, we provide information technology and logistics solutions that enable seamless support to healthcare providers and patients. 

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.

India

Based out of Hyderabad, India, the Quest Global Information Center of Excellence (GIC) is the technology and engineering center of excellence dedicated to leading transformation and innovation efforts by utilizing modern platforms in social, mobile, analytics, and cloud domains to aid the company promise of Action from Insight.

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.

Headquarters

Our corporate headquarters are in New Jersey, located just outside New York City.

500 Plaza Drive
Secaucus, NJ 07094
1-800-222-0446

Collection locations

Drug / Alcohol Screening

Our list of International drug testing collection locations is continuously changing and growing. We have locations in most major cities and a number of smaller, port cities. To inquire about our international drug and alcohol screening collections, or to schedule a collection outside of the US, please contact:

 

  • Asia/Middle East
  • Mexico
  • Other countries

SPECIALIZED TESTING

Nichols Institute Worldwide

Quest Diagnostics international operations team provides sales and marketing support to international clients for specialty diagnostic testing performed at Nichols Institute.  Currently, Nichols Institute performs specialized testing for hospitals and laboratories in more than 50 countries around the world including:

 

  • America:  Canada, México, Guatemala, Honduras, Panama, Dominican Republic
  • South America:  Brazil, Colombia, Ecuador, Peru, Chile
  • Europe:  England, France, Switzerland, Germany, Austria, the Netherlands, Finland, Sweden
  • Asia:  Japan, Taiwan, Philippines, Guam
  • Australia:  Australia, New Zealand

Make an appointment

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

Search patient locations

International facilities

International operations

Lab contact info

Looking for an address or phone number for a laboratory facility?

Click here to contact us

Our company

Quest® is the brand name used for services offered by Quest Diagnostics Incorporated and its affiliated companies. Quest Diagnostics Incorporated and certain affiliates are CLIA-certified laboratories that provide HIPAA-covered services.  Other affiliates operated under the Quest® brand, such as Quest Consumer Inc., do not provide HIPAA-covered services. 

 

Quest®, Quest Diagnostics®, any associated logos, and all associated Quest Diagnostics registered or unregistered trademarks are the property of Quest Diagnostics. All third-party marks—® and ™—are the property of their respective owners. © 2025 Quest Diagnostics Incorporated. All rights reserved. Image content features models and is intended for illustrative purposes only.