Quest Diagnostics Company

We inspire action. We illuminate answers. We advocate better health.

Quest Diagnostics is the world's leading provider of diagnostic testing, services and information that patients and doctors rely on to make better healthcare decisions. Our diagnostic insights reveal new avenues to identify and treat disease, inspire healthy behaviors, and improve health care management. Each day, we impact the lives of millions by empowering people to take action and improve their health outcomes.

We are on a continuous journey of discovery and development. It’s this attitude that has made us an industry leader and the #1 Diagnostic Lab in the US. Quest annually serves one in three American adults and half the physicians and hospitals in the United States, and our 45,000 employees understand that, in the right hands and with the right context, our diagnostic insights can inspire actions that transform lives.