MRO Complete Exam Prep 2026/2027 | 500+ Practice Questions,
Answers & Detailed Rationales | Medical Review Officer Certification
& Recertification
Section 1 — MRO Role, Qualifications & Core Concepts
1. What does MRO stand for in the DOT drug-testing program?
A. Medical Records Officer
B. Medical Review Officer
C. Medical Regulation Official
D. Medication Review Organization
Answer: B. Medical Review Officer
Rationale: An MRO is a licensed physician responsible for receiving and reviewing
laboratory drug-test results and evaluating legitimate medical explanations for
applicable results. (Department of Transportation)
2. Who may serve as an MRO under DOT Part 40?
A. Any registered nurse
B. Any laboratory scientist
C. A licensed physician meeting the regulatory requirements
D. Any occupational health technician
Answer: C. A licensed physician meeting the regulatory requirements
Rationale: DOT §40.121 requires an MRO to be a licensed physician and to meet
specified knowledge and qualification requirements. (Department of
Transportation)
3. Which organization administers the MROCC physician certification
examination?
A. OSHA
B. MROCC
C. FMCSA
D. DEA
,Answer: B. MROCC
Rationale: The Medical Review Officer Certification Council administers its MRO
certification and recertification examinations. (MROCC)
4. The MRO's primary function is to:
A. Discipline employees
B. Decide employee compensation
C. Independently review laboratory results and medical explanations
D. Select employees for random testing
Answer: C. Independently review laboratory results and medical explanations
Rationale: The MRO performs the medical review and verification function rather
than making employer disciplinary decisions.
5. Which party normally receives the MRO's verified DOT result for employer
action?
A. DER
B. Collector
C. Laboratory technician
D. Employee's coworker
Answer: A. DER
Rationale: The Designated Employer Representative is the employer's authorized
contact for receiving applicable test results and managing the employer side of
the program.
6. What does DER mean?
A. Drug Evaluation Representative
B. Designated Employer Representative
C. Diagnostic Examination Reviewer
D. Departmental Evidence Recorder
Answer: B. Designated Employer Representative
Rationale: The DER is the employer-designated person responsible for receiving
specified drug and alcohol testing information and taking appropriate employer
actions.
,7. Which statement best describes the MRO's independence?
A. The MRO should verify results according to the employer's preferred outcome.
B. The MRO should independently evaluate the laboratory result and medical
evidence.
C. The MRO should automatically accept the employee's explanation.
D. The MRO should automatically accept the laboratory's interpretation without
review.
Answer: B. The MRO should independently evaluate the laboratory result and
medical evidence.
Rationale: Independent medical review is central to the MRO role and protects
the integrity of the verification process.
8. Which source is specifically identified by MROCC as an examination
preparation resource?
A. 49 CFR Part 40
B. A random internet forum
C. An employee handbook
D. A commercial driving manual only
Answer: A. 49 CFR Part 40
Rationale: MROCC specifically directs examinees to study DOT Title 49 Part 40
along with MRO competencies and other preparation materials. (MROCC)
9. What is the main purpose of an MRO medical interview?
A. To determine an employee's salary
B. To obtain relevant medical information for verification
C. To investigate workplace harassment
D. To perform a complete annual physical
Answer: B. To obtain relevant medical information for verification
Rationale: DOT §40.141 requires the MRO to conduct a medical interview and
review relevant medical history and biomedical factors. (Department of
Transportation)
, 10. During verification, the MRO should primarily focus on:
A. Relevant medical explanations for the laboratory result
B. The employee's political activities
C. The employee's personal finances
D. The employer's disciplinary preferences
Answer: A. Relevant medical explanations for the laboratory result
Rationale: The verification process is concerned with determining whether a
legitimate medical explanation exists for the applicable laboratory finding.
11. Which professional is responsible for laboratory analysis rather than medical
verification?
A. MRO
B. Laboratory
C. DER
D. SAP
Answer: B. Laboratory
Rationale: The laboratory performs the analytical testing, while the MRO
independently reviews and verifies applicable laboratory results.
12. What does CCF generally mean?
A. Controlled Collection File
B. Custody and Control Form
C. Clinical Certification Form
D. Collection Compliance File
Answer: B. Custody and Control Form
Rationale: The CCF documents key information and chain-of-custody events
associated with the specimen.
13. Which party collects the specimen?
A. MRO
B. Collector
C. SAP
D. DER
Answers & Detailed Rationales | Medical Review Officer Certification
& Recertification
Section 1 — MRO Role, Qualifications & Core Concepts
1. What does MRO stand for in the DOT drug-testing program?
A. Medical Records Officer
B. Medical Review Officer
C. Medical Regulation Official
D. Medication Review Organization
Answer: B. Medical Review Officer
Rationale: An MRO is a licensed physician responsible for receiving and reviewing
laboratory drug-test results and evaluating legitimate medical explanations for
applicable results. (Department of Transportation)
2. Who may serve as an MRO under DOT Part 40?
A. Any registered nurse
B. Any laboratory scientist
C. A licensed physician meeting the regulatory requirements
D. Any occupational health technician
Answer: C. A licensed physician meeting the regulatory requirements
Rationale: DOT §40.121 requires an MRO to be a licensed physician and to meet
specified knowledge and qualification requirements. (Department of
Transportation)
3. Which organization administers the MROCC physician certification
examination?
A. OSHA
B. MROCC
C. FMCSA
D. DEA
,Answer: B. MROCC
Rationale: The Medical Review Officer Certification Council administers its MRO
certification and recertification examinations. (MROCC)
4. The MRO's primary function is to:
A. Discipline employees
B. Decide employee compensation
C. Independently review laboratory results and medical explanations
D. Select employees for random testing
Answer: C. Independently review laboratory results and medical explanations
Rationale: The MRO performs the medical review and verification function rather
than making employer disciplinary decisions.
5. Which party normally receives the MRO's verified DOT result for employer
action?
A. DER
B. Collector
C. Laboratory technician
D. Employee's coworker
Answer: A. DER
Rationale: The Designated Employer Representative is the employer's authorized
contact for receiving applicable test results and managing the employer side of
the program.
6. What does DER mean?
A. Drug Evaluation Representative
B. Designated Employer Representative
C. Diagnostic Examination Reviewer
D. Departmental Evidence Recorder
Answer: B. Designated Employer Representative
Rationale: The DER is the employer-designated person responsible for receiving
specified drug and alcohol testing information and taking appropriate employer
actions.
,7. Which statement best describes the MRO's independence?
A. The MRO should verify results according to the employer's preferred outcome.
B. The MRO should independently evaluate the laboratory result and medical
evidence.
C. The MRO should automatically accept the employee's explanation.
D. The MRO should automatically accept the laboratory's interpretation without
review.
Answer: B. The MRO should independently evaluate the laboratory result and
medical evidence.
Rationale: Independent medical review is central to the MRO role and protects
the integrity of the verification process.
8. Which source is specifically identified by MROCC as an examination
preparation resource?
A. 49 CFR Part 40
B. A random internet forum
C. An employee handbook
D. A commercial driving manual only
Answer: A. 49 CFR Part 40
Rationale: MROCC specifically directs examinees to study DOT Title 49 Part 40
along with MRO competencies and other preparation materials. (MROCC)
9. What is the main purpose of an MRO medical interview?
A. To determine an employee's salary
B. To obtain relevant medical information for verification
C. To investigate workplace harassment
D. To perform a complete annual physical
Answer: B. To obtain relevant medical information for verification
Rationale: DOT §40.141 requires the MRO to conduct a medical interview and
review relevant medical history and biomedical factors. (Department of
Transportation)
, 10. During verification, the MRO should primarily focus on:
A. Relevant medical explanations for the laboratory result
B. The employee's political activities
C. The employee's personal finances
D. The employer's disciplinary preferences
Answer: A. Relevant medical explanations for the laboratory result
Rationale: The verification process is concerned with determining whether a
legitimate medical explanation exists for the applicable laboratory finding.
11. Which professional is responsible for laboratory analysis rather than medical
verification?
A. MRO
B. Laboratory
C. DER
D. SAP
Answer: B. Laboratory
Rationale: The laboratory performs the analytical testing, while the MRO
independently reviews and verifies applicable laboratory results.
12. What does CCF generally mean?
A. Controlled Collection File
B. Custody and Control Form
C. Clinical Certification Form
D. Collection Compliance File
Answer: B. Custody and Control Form
Rationale: The CCF documents key information and chain-of-custody events
associated with the specimen.
13. Which party collects the specimen?
A. MRO
B. Collector
C. SAP
D. DER
