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What Does an MRO Do?

Updated: Sep 26, 2023

Drug testing is an integral part of the onboarding process for many companies across various industries. As businesses prioritize safety, productivity, and a drug-free workplace, the need for accurate and reliable drug testing procedures has grown. One crucial component of this process is the Medical Review Officer (MRO). In this article, we will delve into the significance of MROs in drug testing for employment and how they contribute to maintaining the integrity of the testing process.

Understanding Employment Drug Testing

Employment drug testing involves screening potential and current employees for the presence of illicit drugs or prescription medications that could impair their performance, safety, or ability to fulfill their job responsibilities. The tests are typically conducted during the pre-employment phase when a contingent offer is made, after workplace accidents, as part of routine safety checks, or in response to reasonable suspicion.

Role of Medical Review Officers (MROs)

Medical Review Officers play a pivotal role in the employment drug testing process. Their primary responsibility is to review and interpret the results of drug tests conducted on employees or job applicants. Here's how MROs contribute to the accuracy and fairness of the testing process:

  • Reviewing and Verifying Results:

drug test forms

MROs review drug test results

to ensure accuracy and reliability. They analyze laboratory reports to confirm the presence of drugs or their metabolites in the samples. This step is crucial to prevent false positives caused by factors like over-the-counter medications, medical conditions, or dietary habits.

  • Prescription Medication Verification: MROs review medical records and documentation provided by individuals who have tested positive for prescription medications. If the individual has a valid prescription for the detected drug, the MRO confirms the legitimacy of the prescription and adjusts the test result accordingly. This step prevents qualified candidates from being unfairly penalized.

  • Confidentiality and Privacy: MROs are bound by strict confidentiality regulations. They ensure that an individual's drug test results remain private and are not disclosed without proper consent or legal justification. This confidentiality is crucial to protect individuals' rights and maintain the integrity of the testing process.

  • Communication: MROs serve as intermediaries between laboratories, employers, and employees. They communicate with laboratories to clarify any discrepancies in test results, coordinate prescription verification, and ensure that all parties have accurate information.

  • Final Determination: After evaluating all relevant information, the MRO makes a final determination regarding the test results. If the individual has a legitimate prescription, the result is reported as negative. If the test result is confirmed positive for illegal substances without a valid prescription, the MRO reports the finding to the employer.

How Important are MROs in Drug Testing?

The involvement of MROs in the employment drug testing process brings several crucial benefits:

  • Accuracy: MROs help prevent false positives and ensure that individuals with valid prescriptions are not reported as using illicit drugs.

  • Fairness: MROs provide an avenue for individuals to explain and verify their drug test results, preserving fairness and avoiding unjust penalties.

  • Legal Compliance: MROs help companies comply with legal requirements and regulations surrounding drug testing, reducing the risk of legal disputes.

  • Confidentiality: MROs uphold the privacy of individuals' medical information, maintaining trust and professionalism in the testing process.

drug test review

Medical Review Officers play a critical role in the complex landscape of employment drug testing. Their expertise in interpreting drug test results, verifying prescriptions, and ensuring confidentiality contributes to accurate, fair, and legally compliant testing procedures. By maintaining the integrity of the process, MROs assist companies in cultivating safe, productive, and drug-free work environments for employees and employers alike.


Shane is the Director of Marketing for Integris. With over a decade of experience in the background screening industry, he holds an advanced FCRA certification from the Professional Background Screening Association.

The information provided is not intended to constitute legal advice and is for informational purposes only.

Employers are strongly advised to consult with legal counsel on matters related to the Fair Credit Reporting Act.


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