Quest Diagnostics

About Us


We are an industry leader with a longstanding reputation for exceptional quality and stability in our market.
We inspire action, illuminate answers, and advocate better health.

At Quest Diagnostics, we are dedicated to continuously improving patient health. We are the world’s leading provider of diagnostic testing, services, and information that patients and doctors rely on to make better healthcare decisions.

Each day, we impact the lives of millions, serving one in three American adults. Our continuous pursuit to discover and innovate enables us to create new solutions every day, many of which are now industry standards of care. Diagnostic tests influence about 66% of clinical decision making