National Occupational Health Services

[ Occupational Testing | Medical Surveillance | Drug & Alcohol Testing ]

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Chain of Custody

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NOHS uses Chain of Custody forms that adhere to lab and government guidelines. The term refers to the paperwork process that provides the ability to guarantee the identity and integrity of the specimen sample from the initial collection to the reporting of the test results. Each chain of custody provides an accurate writen record to track the possession, handling and location of samples from collection through reporting.

National Occupational Health Services
Mailing Address
6848 East 41st Street
Tulsa, Oklahoma 74145
918-794-4777 (phone) 800-900-6647 (toll-free) 918-794-4777 (fax)