Quest Diagnostics Incorporated. The Group's principal activities are to provide diagnostic testing, information and services, providing insights that enable physicians and other healthcare professionals to make decisions to improve health. The Group offers patients and physicians the broadest access to diagnostic laboratory services through its ... More

Quest Diagnostics Incorporated. The Group's principal activities are to provide diagnostic testing, information and services, providing insights that enable physicians and other healthcare professionals to make decisions to improve health. The Group offers patients and physicians the broadest access to diagnostic laboratory services through its nationwide network of laboratories and owned patient service centers. It provides esoteric testing including gene-based testing and testing for drug abuse, anatomic pathology services, testing for clinical trials and risk assessment services for the life insurance industry. The Group operates throughout the United States, Canada , United Kingdom, India, Australia, China, Singapore and South Africa .