Quest Diagnostics Inc. is a healthcare diagnostics company that provides diagnostic testing, information, and related services for physicians, hospitals, patients, and consumers. Quest Diagnostics Inc. operates through its Diagnostic Information Services segment, which supports routine and specialized laboratory testing, and an All Other segment that includes risk assessment services and healthcare information technology. The company serves a broad range of customers across the healthcare system, helping support clinical decision-making, disease detection, and ongoing patient care. Quest Diagnostics Inc. plays an important role in medical diagnostics by connecting laboratory science with practical healthcare delivery through testing networks, data-driven services, and technology-enabled solutions. Based in Secaucus, New Jersey, the company is a major participant in the diagnostics and research market and is recognized for its wide reach across clinical and consumer testing needs.