MRO Complete Exam Prep 2026/2027 | 500+ Practice Questions,
Answers & Detailed Rationales | Medical Review Officer Certification
& Recertification
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 urine specimens
B. Review laboratory results and determine whether there is a legitimate medical
explanation
C. Discipline employees who test positive
D. Perform workplace inspections
Answer: B. Review laboratory results and determine whether there is a
legitimate medical explanation
Rationale: The MRO is a licensed physician who independently reviews laboratory
results and evaluates medical explanations before a final verified result is
reported.
2. Which professional must serve as the MRO under DOT regulations?
A. Registered nurse
B. Pharmacist
C. Licensed physician
D. Laboratory technician
Answer: C. Licensed physician
Rationale: DOT regulations require the MRO to be a licensed physician who meets
the applicable qualification requirements.
3. What does DER stand for?
A. Drug Evaluation Representative
B. Designated Employer Representative
,C. Departmental Examination Reviewer
D. Drug Enforcement Reviewer
Answer: B. Designated Employer Representative
Rationale: The DER is the employer's designated contact for receiving drug and
alcohol testing information and administering the employer's testing program.
4. What is the primary responsibility of a specimen collector?
A. Verify prescriptions
B. Determine whether a positive result has a medical explanation
C. Collect and document the specimen according to applicable procedures
D. Decide disciplinary action
Answer: C. Collect and document the specimen according to applicable
procedures
Rationale: Collectors are responsible for the collection process and
documentation. They do not perform the MRO's medical verification function.
5. What does CCF commonly mean in DOT drug testing?
A. Clinical Confirmation File
B. Custody and Control Form
C. Controlled Collection Facility
D. Certified Confirmation Form
Answer: B. Custody and Control Form
Rationale: The Custody and Control Form documents the collection and chain of
custody associated with a drug-test specimen.
6. What is a C/TPA?
A. Certified Toxicology/Pharmacology Analyst
B. Consortium/Third-Party Administrator
C. Collection/Test Processing Authority
D. Clinical Testing/Physician Association
Answer: B. Consortium/Third-Party Administrator
Rationale: A C/TPA may provide administrative services related to DOT drug and
alcohol testing programs.
,7. Which professional is primarily responsible for conducting a return-to-duty or
follow-up treatment evaluation?
A. MRO
B. SAP
C. Collector
D. Laboratory accessioner
Answer: B. SAP
Rationale: A Substance Abuse Professional (SAP) performs the required
assessment and recommendation functions associated with the return-to-duty
and follow-up process.
8. What does SAP stand for?
A. Substance Abuse Professional
B. Specimen Analysis Physician
C. Safety Assessment Professional
D. Substance Administration Provider
Answer: A. Substance Abuse Professional
Rationale: The SAP is a specifically qualified professional who evaluates
employees after certain drug/alcohol violations and provides recommendations
for education, treatment, and return to duty.
9. Which party normally makes employment or disciplinary decisions after
receiving a verified DOT drug-test result?
A. MRO
B. Laboratory
C. Employer
D. Collector
Answer: C. Employer
Rationale: The MRO verifies the result; employment consequences are generally
handled by the employer under applicable law and company policy.
10. Which statement best describes the MRO's independence?
A. The MRO should favor the employer
, B. The MRO should favor the employee
C. The MRO should make an objective medical and regulatory determination
D. The MRO should follow the collector's opinion
Answer: C. The MRO should make an objective medical and regulatory
determination
Rationale: The MRO's role requires independent evaluation of laboratory findings
and relevant medical information.
11. What is a laboratory-confirmed non-negative result before MRO verification?
A. Automatically a final verified positive
B. A result requiring MRO review
C. Automatically a refusal
D. Automatically negative
Answer: B. A result requiring MRO review
Rationale: A laboratory-confirmed non-negative finding is reviewed by the MRO
before the DOT result is finalized as required by the applicable process.
12. What is the main purpose of the MRO interview?
A. Determine employee salary
B. Investigate unrelated workplace misconduct
C. Determine whether there is a legitimate medical explanation for the laboratory
result
D. Replace the SAP evaluation
Answer: C. Determine whether there is a legitimate medical explanation for the
laboratory result
Rationale: The interview allows the MRO to obtain relevant medical history,
medication information, and other evidence needed for verification.
13. Which source generally provides the governing DOT drug-testing
procedures?
A. 49 CFR Part 40
B. OSHA Form 300 only
Answers & Detailed Rationales | Medical Review Officer Certification
& Recertification
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 urine specimens
B. Review laboratory results and determine whether there is a legitimate medical
explanation
C. Discipline employees who test positive
D. Perform workplace inspections
Answer: B. Review laboratory results and determine whether there is a
legitimate medical explanation
Rationale: The MRO is a licensed physician who independently reviews laboratory
results and evaluates medical explanations before a final verified result is
reported.
2. Which professional must serve as the MRO under DOT regulations?
A. Registered nurse
B. Pharmacist
C. Licensed physician
D. Laboratory technician
Answer: C. Licensed physician
Rationale: DOT regulations require the MRO to be a licensed physician who meets
the applicable qualification requirements.
3. What does DER stand for?
A. Drug Evaluation Representative
B. Designated Employer Representative
,C. Departmental Examination Reviewer
D. Drug Enforcement Reviewer
Answer: B. Designated Employer Representative
Rationale: The DER is the employer's designated contact for receiving drug and
alcohol testing information and administering the employer's testing program.
4. What is the primary responsibility of a specimen collector?
A. Verify prescriptions
B. Determine whether a positive result has a medical explanation
C. Collect and document the specimen according to applicable procedures
D. Decide disciplinary action
Answer: C. Collect and document the specimen according to applicable
procedures
Rationale: Collectors are responsible for the collection process and
documentation. They do not perform the MRO's medical verification function.
5. What does CCF commonly mean in DOT drug testing?
A. Clinical Confirmation File
B. Custody and Control Form
C. Controlled Collection Facility
D. Certified Confirmation Form
Answer: B. Custody and Control Form
Rationale: The Custody and Control Form documents the collection and chain of
custody associated with a drug-test specimen.
6. What is a C/TPA?
A. Certified Toxicology/Pharmacology Analyst
B. Consortium/Third-Party Administrator
C. Collection/Test Processing Authority
D. Clinical Testing/Physician Association
Answer: B. Consortium/Third-Party Administrator
Rationale: A C/TPA may provide administrative services related to DOT drug and
alcohol testing programs.
,7. Which professional is primarily responsible for conducting a return-to-duty or
follow-up treatment evaluation?
A. MRO
B. SAP
C. Collector
D. Laboratory accessioner
Answer: B. SAP
Rationale: A Substance Abuse Professional (SAP) performs the required
assessment and recommendation functions associated with the return-to-duty
and follow-up process.
8. What does SAP stand for?
A. Substance Abuse Professional
B. Specimen Analysis Physician
C. Safety Assessment Professional
D. Substance Administration Provider
Answer: A. Substance Abuse Professional
Rationale: The SAP is a specifically qualified professional who evaluates
employees after certain drug/alcohol violations and provides recommendations
for education, treatment, and return to duty.
9. Which party normally makes employment or disciplinary decisions after
receiving a verified DOT drug-test result?
A. MRO
B. Laboratory
C. Employer
D. Collector
Answer: C. Employer
Rationale: The MRO verifies the result; employment consequences are generally
handled by the employer under applicable law and company policy.
10. Which statement best describes the MRO's independence?
A. The MRO should favor the employer
, B. The MRO should favor the employee
C. The MRO should make an objective medical and regulatory determination
D. The MRO should follow the collector's opinion
Answer: C. The MRO should make an objective medical and regulatory
determination
Rationale: The MRO's role requires independent evaluation of laboratory findings
and relevant medical information.
11. What is a laboratory-confirmed non-negative result before MRO verification?
A. Automatically a final verified positive
B. A result requiring MRO review
C. Automatically a refusal
D. Automatically negative
Answer: B. A result requiring MRO review
Rationale: A laboratory-confirmed non-negative finding is reviewed by the MRO
before the DOT result is finalized as required by the applicable process.
12. What is the main purpose of the MRO interview?
A. Determine employee salary
B. Investigate unrelated workplace misconduct
C. Determine whether there is a legitimate medical explanation for the laboratory
result
D. Replace the SAP evaluation
Answer: C. Determine whether there is a legitimate medical explanation for the
laboratory result
Rationale: The interview allows the MRO to obtain relevant medical history,
medication information, and other evidence needed for verification.
13. Which source generally provides the governing DOT drug-testing
procedures?
A. 49 CFR Part 40
B. OSHA Form 300 only
