Quest Diagnostics is the “Reference Lab for reference labs” in many countries across the globe. Serving more than half the hospitals in the United States, and providing healthcare connectivity solutions to over 250,000 physician and hospital accounts, we are the world’s leading provider of diagnostic testing, information and services that patients and doctors need to make better healthcare decisions. This includes expertise in cancer, cardiovascular disease, neurology and infectious disease. We have delivered innovative, ground-breaking tests to enhance patient care and transform information into knowledge and insights and we have delivered over 20 billion test results over the past decade.

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

Diagnostics Services

Lab technicians with test tube

Quest Diagnostics is driven to discover and deliver diagnostic insights and innovations that help to improve human health. We offer a wide range of diagnostic services that benefit patients, healthcare providers, pharmaceutical and medical device companies, life insurance companies and employers.

Facts and Figures

Quest headquarters

Quest Diagnostics is the world's leading provider of diagnostic information services needed to make better healthcare decisions. We offer the broadest access to diagnostic testing services through our network of laboratories and patient service centers, and provide interpretive consultation through our extensive medical and scientific staff. Quest Diagnostics is a pioneer in developing innovative diagnostic tests and advanced healthcare information technology solutions that help improve patient care.

Clinical Solutions

Lab staff picking up one of several test tubes

Our dedicated clinical specialties can offer customized solutions to help with patient care and attract more patients to your institution.