Quest Diagnostics Incorporated operates clinical laboratories in the U.S, Puerto Rico, Mexico, and Brazil. The company also maintains collaborative agreements with hospitals and clinics around the world. The company offers diagnostic testing services for cancer, cardiovascular disease, infectious disease, neurological disorders, and COVID-19, as well as employment and court-ordered drug testing. Quest Diagnostics was founded in 1967 and is headquartered in Secaucus, NJ.