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Quest Diagnostics Incorporated provides diagnostic testing and services in the United States and internationally. The company develops and delivers diagnostic information services, such as routine, non-routine and advanced clinical testing, anatomic pathology testing, and other diagnostic information services. It offers diagnostic information services primarily under the Quest Diagnostics brand, as well as under the AmeriPath, Dermpath Diagnostics, ExamOne, and Quanum brands to physicians, hospitals, patients and consumers, health plans, government agencies, employers, retailers, pharmaceutical companies and insurers, and accountable care organizations through a network of laboratories, patient service centers, phlebotomists in physician offices, call centers and mobile phlebotomists, nurses, and other health and wellness professionals. The company also provides risk assessment services for the life insurance industry; and healthcare organizations and clinicians information technology solutions. Quest Diagnostics Incorporated was founded in 1967 and is headquartered in Secaucus, New Jersey.

Exact Sciences Corporation provides cancer screening and diagnostic test products in the United States and internationally. The company offers Cologuard, a non-invasive stool-based DNA screening test to detect DNA and hemoglobin biomarkers associated with colorectal cancer and pre-cancer. It also provides Oncotype DX Breast Recurrence Score Test; Oncotype DX Breast DCIS Score Test; Oncotype DX Colon Recurrence Score Test; OncoExTra Test for tumor profiling for patients with advanced, metastatic, refractory, relapsed, or recurrent cancer; and Covid-19 testing services. The company's pipeline products focus on enhancing the Cologuard test's performance characteristics and developing blood and other fluid-based tests. It has license agreements with MAYO Foundation for Medical Education and Research, and Johns Hopkins University. Exact Sciences Corporation was incorporated in 1995 and is headquartered in Madison, Wisconsin.

Guardant Health, Inc., a precision oncology company, provides blood and tissue tests, data sets, and analytics in the United States and internationally. The company provides Guardant360; Guardant360 LDT; Guardant360 CDx Test; Guardant360 Response Test; Guardant360 TissueNext Test; GuardantINFINITY Test; GuardantConnect, an integrated software-based solution designed for clinical and biopharmaceutical customers to connect patients tested with assays with actionable alterations with potentially relevant clinical studies; GuardantOMNI Test for advanced stage cancer; and GuardantINFORM, an in-silico research platform for tumor evolution and treatment resistance across various biomarker-driven cancers. It offers Shield Test; Guardant Reveal Test for adjuvant treatment selection in early-stage cancer patients; Smart Liquid Biopsy Platform; and Guardant Galaxy, an AI-backed digital pathology platform that helps improve cancer biomarker detection. In addition, the company offers development services, including companion diagnostic development and regulatory approval, clinical study setup, monitoring and maintenance, testing development and support, technologies licensing, and kits fulfillment. The company has a collaboration agreement with Illumina, Inc. for the sharing of specimen samples to advance cancer research. The company was incorporated in 2011 and is headquartered in Palo Alto, California.

Laboratory Corporation of America Holdings operates as a life sciences company that provides vital information to help doctors, hospitals, pharmaceutical companies, researchers, and patients make clear and confident decisions. It operates in two segments, Labcorp Diagnostics (Dx) and Biopharma Laboratory Services (BLS). The company offers various tests, such as blood chemistry analyses, urinalyses, blood cell counts, thyroid tests, PAP tests, hemoglobin A1C and vitamin D, prostate-specific antigens, tests for sexually transmitted diseases, hepatitis C tests, microbiology cultures and procedures, and alcohol and other substance-abuse tests. It also provides specialty testing services comprising gene-based and esoteric testing; advanced tests target specific diseases; services related to anatomic pathology/oncology, cardiovascular disease, coagulation, diagnostic genetics, endocrinology, infectious disease, women's health, pharmacogenetics, parentage and donor testing, occupational testing services, medical drug monitoring services, chronic disease programs, and kidney stone prevention tests; and health and wellness services to employers and managed care organizations (MCOs), including health fairs, on-site and at-home testing, vaccinations, and health screenings. In addition, the company offers online and mobile applications that enable patients to check test results; online applications for providers, MCOs, and accountable care organizations; and drug development, medical device, and companion diagnostic development solutions from early-stage research to clinical development, as well as support for crop protection and chemical testing. It serves pharmaceutical, biotechnology, medical device, and diagnostics companies; and MCOs, employer plans, other health insurance providers, governmental agencies, physicians and other healthcare providers, hospitals and health systems, employers, patients and consumers, contract research organizations, crop protection and chemical companies, academic institutions, independent clinical laboratories, and retailers. The company was incorporated in 1994 and is headquartered in Burlington, North Carolina.