"Laboratory test results impact more than 70% of healthcare decisions. Although these results are critically important in helping physicians determine whether patients are healthy or ill, they represent less than 3% of healthcare spending in the United States. The intrinsic value of the services we provide ensures we have a critical role to play in serving patient needs and sets the stage for consistent, strong financial performance for years to come."

Diagnostic Testing & Services
Quest Diagnostics operates 24 hours a day, 7 days a week, 365 days a year, providing our customers with a comprehensive menu of routine and specialty laboratory tests and services. With the consolidated capabilities of our regional laboratories, expanding international presence and the additional esoteric capabilities of Nichols Institute, we are able to offer unequaled convenience in utilizing one laboratory for all diagnostic and prognostic clinical testing needs.

Diagnostic Testing & Services >

Clinical Trials
Quest Diagnostics is one of the largest providers of global central laboratory services performed in connection with clinical research trials on new drugs. Clinical research trials assess the safety and efficacy of new drugs.

Quest Diagnostics Clinical Trials >