What is an MRO, and what role do they play in a drug screen?

MRO is an acronym for Medical Review Officer. An MRO acts as an independent impartial evaluator and advocate for the accuracy and integrity of the drug testing process

He or she is a licensed physician who is responsible for reviewing laboratory results generated by an employer’s drug testing program while evaluating medical explanations for certain drug test results.

Their task is to provide a quality assurance analysis of the drug testing procedure for the sampling under their review. Secondly, they have the responsibility to determine if there is a decisive medical explanation for laboratory confirmed positive, adulterated, substituted or invalid drug test results.

Finally, they ensure the timely flow of the result and other information to employers and protect the confidentiality of the drug testing information.

Most importantly, they perform an important function in the DOT safety program, as such, it is important for them to fully understand the regulations. 

The MRO should be familiar with 49 CFR Part 40 while paying close attention to the following:

The MRO should be familiar with 49 CFR Part 40 while paying close attention to the following:

For more information, contact the American Association of Medical Review Officers

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Andrew Knox

Andrew Knox is the President and Owner of PROCOM Testing and one of Colorado's most recognized voices on workplace drug testing, DOT compliance, and FMCSA regulations. Since acquiring PROCOM in 2017, Andrew has grown the company into a statewide compliance partner serving over 4,000 employers across both the public sector and transportation, construction, healthcare, and energy industries. His background in healthcare finance and analytics, developed over nearly a decade at DaVita, gives him a sharper lens on compliance risk than most in the industry. Andrew holds degrees from Whitman College (Biology and Economics) and Claremont McKenna College (Finance), and writes regularly on DOT regulations, FMCSA Clearinghouse requirements, and workplace safety policy for employers navigating an increasingly complex regulatory environment.