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What is a consortium/third-party administrator (C/TPA)?
Last Updated: 09/25/2026

A C/TPA is a service agent that manages all or part of an employer's DOT drug and alcohol testing program (49 CFR 40.3). A consortium combines several employers' covered employees into one random testing pool, which is how small employers and owner-operators usually meet the random testing rules.

C/TPA services can include random selections, arranging collections, MRO and SAP coordination, recordkeeping, MIS reports, and Clearinghouse reporting for employers that designate the C/TPA. The employer remains responsible for compliance (49 CFR 40.15).

The Med-Stop Random Service is a single-employer program, not a consortium. Owner-operators and employers who need a consortium should read DOT random testing consortium.

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