Quest Diagnostics, founded through a series of corporate spin-offs and acquisitions in the mid-1990s, is a leading provider of diagnostic testing, information, and services. Headquartered in Secaucus, New Jersey, the company operates one of the largest clinical laboratory networks in the United States, supported by a comprehensive suite of laboratory information systems and logistics infrastructure. Quest Diagnostics serves healthcare providers, hospitals, employers, insurers and patients, enabling accurate and timely diagnosis and disease monitoring.
The company’s core offerings include routine and specialty laboratory tests spanning more than 3,000 tests and test combinations. These services encompass clinical chemistry, immunology, molecular diagnostics, genetic and genomic testing, and anatomic pathology. Quest Diagnostics also offers digital health and telehealth solutions, allowing physicians and patients to access test results, order services and manage chronic conditions through secure online platforms and mobile applications. The company has further expanded into wellness and occupational health services, delivering preventive screening and on-site testing programs for corporate and community clients.
Quest Diagnostics maintains a nationwide network of laboratories, patient service centers, and mobile collection sites, ensuring broad geographic coverage across all 50 states and select international markets. It partners with major hospital systems, healthcare networks and public health agencies to support population health management and large-scale testing initiatives. Internationally, Quest has established collaborations and joint ventures to extend its diagnostic capabilities into Europe, Latin America and Asia Pacific regions.
Under the leadership of Chairman and Chief Executive Officer Steve Rusckowski, Quest Diagnostics has pursued strategic acquisitions and investments in advanced testing technologies and digital platforms. The company continues to focus on innovative diagnostics solutions and expanding access to care, aiming to improve health outcomes through early detection and personalized medicine. With a commitment to quality, regulatory compliance and scientific rigor, Quest Diagnostics remains a cornerstone of the global healthcare ecosystem.
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