Our Present: Our Business is Knowing

Today, Quest Diagnostics is the world’s leading provider of diagnostic information services, with $7.5 billion in annual revenues and 43,000 employees. Quest provides services that empowers people to take action to improve health outcomes. Derived from the world's largest database of clinical lab results, the company’s diagnostic insights reveal new avenues to identify and treat disease, inspire healthy behaviors and improve health care management. For this reason, we say our business is about helping people know. Our Knowing campaign is about the confidence that comes with knowing the important information that guides healthcare decisions.

Quest Diagnostics provides thousands of laboratory services, from genetic tests to predict cancer risk to blood tests for diabetes and heart disease. The company annually serves one in three adult Americans and half the physicians and hospitals in the United States. Many of the world’s marquee health systems turn to Quest to provide laboratory testing and management for their most complex and challenging cases.

San Juan Capistrano facility

Quest Diagnostics is consistently recognized as a leading company by organizations and publications, such as Forbes, Fortune and others. The company is the only diagnostic information services provider ranked among Fortune’s Most Admired Companies.