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Quest Diagnostics is the world’s leading provider of drug testing services. Each year, Quest Diagnostics performs more than 8.5 million drug tests, operates 24/7, and offers a comprehensive range of laboratory, on-site drug testing services, and programs. Quest Diagnostics has established a reputation as a national leader in drug testing, with full accreditation by leading healthcare institutions and government agencies. Quest Diagnostics provides MRO services in addition to other services.

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