MRO Certification Exam 2026/2027 | 300 Practice Questions, Correct Answers & Detailed Rationales | Medical Review Officer

MRO Certification Exam 2026/2027 | 300 Practice Questions, Correct
Answers & Detailed Rationales | Medical Review Officer


Section 1: MRO Fundamentals, Roles & Responsibilities
1. What is the primary function of a Medical Review Officer (MRO) in a DOT
drug-testing program?
A. Collect every employee specimen
B. Independently review and verify laboratory drug-test results
C. Decide employee disciplinary action
D. Conduct all workplace alcohol tests
Answer: B. Independently review and verify laboratory drug-test results
Rationale: The MRO provides an independent medical review of laboratory
findings and determines whether a verified non-negative result has an acceptable
medical explanation under the applicable rules.
2. Which professional is generally responsible for making employment or
disciplinary decisions after receiving an MRO result?
A. MRO
B. Laboratory director
C. Employer or designated employer representative
D. Specimen collector
Answer: C. Employer or designated employer representative
Rationale: The MRO determines and reports the testing result according to the
regulatory framework. Employment actions remain an employer responsibility.
3. What does MRO stand for?
A. Medical Reporting Organization
B. Medical Review Officer

,C. Medication Review Organization
D. Medical Regulation Official
Answer: B. Medical Review Officer
Rationale: MRO is the standard abbreviation for Medical Review Officer, the
physician who performs the medical review and verification function.
4. What does DER stand for in DOT drug and alcohol testing?
A. Drug Evaluation Reviewer
B. Designated Employee Reviewer
C. Designated Employer Representative
D. Drug Enforcement Representative
Answer: C. Designated Employer Representative
Rationale: The DER is the employer's designated contact responsible for receiving
specified testing information and managing the employer side of the program.
5. What is the primary purpose of MRO verification?
A. Determine whether the employee should be fired
B. Determine whether a laboratory non-negative result is reportable under the
applicable rules
C. Recollect every specimen
D. Replace laboratory testing
Answer: B. Determine whether a laboratory non-negative result is reportable
under the applicable rules
Rationale: Verification connects the laboratory result with the required medical
review and regulatory decision-making process.
6. Which activity is normally part of the MRO's verification process?
A. Medical interview
B. Employee salary negotiation
C. Hiring decision
D. Workplace scheduling

,Answer: A. Medical interview
Rationale: DOT regulations require the MRO to conduct a medical interview and
review relevant medical history and biomedical factors. (Department of
Transportation)
7. What is the most appropriate attitude for an MRO during an employee
interview?
A. Confrontational
B. Judgmental
C. Objective and professional
D. Punitive
Answer: C. Objective and professional
Rationale: The MRO's role is an independent medical and regulatory review, not
punishment or advocacy.
8. Which principle is especially important when an MRO reviews a potentially
positive result?
A. Presume guilt
B. Ignore medical history
C. Evaluate the result objectively under applicable regulations
D. Accept every explanation without verification
Answer: C. Evaluate the result objectively under applicable regulations
Rationale: Verification requires objective consideration of laboratory findings,
medical information, and applicable regulatory requirements.
9. MROCC physician certification examinations are based primarily on which
regulatory framework and competency document?
A. OSHA Part 1910 only
B. 49 CFR Part 40 and MRO Competencies
C. HIPAA alone
D. State traffic law

, Answer: B. 49 CFR Part 40 and MRO Competencies
Rationale: MROCC identifies 49 CFR Part 40 and the MRO Competencies as the
basis for its certification examinations. (MROCC)
10. According to current MROCC information, the initial online physician
certification examination contains how many multiple-choice questions?
A. 50
B. 75
C. 100
D. 110
Answer: D. 110
Rationale: MROCC currently lists the online initial certification examination as 110
multiple-choice questions with up to three hours for completion. (MROCC)
11. Which person normally performs the laboratory analysis of a DOT drug
specimen?
A. MRO
B. HHS-certified laboratory
C. DER
D. SAP
Answer: B. HHS-certified laboratory
Rationale: DOT drug testing uses laboratories certified under HHS requirements
for the applicable testing functions.
12. What is the purpose of the MRO's independence?
A. To allow the MRO to make employment decisions
B. To prevent objective review of laboratory results
C. To provide an impartial medical assessment
D. To eliminate laboratory testing
Answer: C. To provide an impartial medical assessment