A Medical Review Officer, commonly called an MRO, is a licensed physician with specialized knowledge of drug-testing procedures and substance-use disorders. The MRO provides an independent medical review between the laboratory result and the final verified result reported to the employer.
Why is MRO review important?
A laboratory detects and reports analytical findings; it does not make employment decisions or independently determine whether a legitimate medical explanation exists. The MRO reviews required documentation, checks the integrity of the testing process, and follows the applicable verification procedure before reporting a verified result.
What happens after a non-negative laboratory result?
The MRO typically attempts to contact the donor for a confidential interview, reviews relevant medical information, and determines whether the result should be verified as positive, negative, refusal-related, or another reportable outcome under the applicable program. Exact procedures differ between DOT and non-DOT programs.
What does the employer receive?
The employer receives the verified result and information permitted or required by the applicable rules and policy—not the employee’s full medical history. Employers should restrict access to testing records and assign a trained contact to receive and act on results.
Does an MRO decide whether someone is fired?
No. The MRO verifies test results and performs defined medical-review functions. The employer applies its policy and applicable law. In DOT programs, required consequences and return-to-duty procedures also apply.
Frequently asked questions
Are all negative tests personally interviewed by an MRO?
No. The verification process and level of review depend on the result and the testing program.
Can a prescription automatically cancel a positive result?
No. The MRO evaluates whether there is a legitimate medical explanation under the applicable rules and supporting information.
Does Lab Test Solutions provide MRO-coordinated testing?
Yes. Applicable laboratory-based testing can include MRO review and secure result reporting.
Authoritative sources
Use the current official rules and qualified counsel when making program or employment decisions.