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Quest Diagnostics is one of the largest American companies focused on laboratory diagnostics and medical testing services. Quest Diagnostics provides blood testing, preventive screenings, genetic analysis, and specialized laboratory services for hospitals, physicians, and patients. Founded in 1967, the company gradually built a large network of laboratories and patient service centers across the United States. Quest Diagnostics is known for using modern technology, delivering fast test results, and improving access to healthcare services. In recent years, it has invested in digital tools, online access to test results, and the expansion of preventive healthcare solutions. Looking ahead, Quest Diagnostics aims to strengthen its position in healthcare diagnostics and personalized medicine.