MRO Certification Exam 2026/2027 | 300 Practice Questions, Correct
Answers & Detailed Rationales | Medical Review Officer
Questions 1–50: MRO Role, Responsibilities & Core Concepts
1. What is the primary function of a Medical Review Officer (MRO)?
A. Collect specimens
B. Independently review and verify laboratory drug-test results
C. Discipline employees
D. Operate laboratory instruments
Answer: B. Independently review and verify laboratory drug-test results
Rationale: The MRO provides an independent medical review of laboratory-
confirmed results and determines whether a legitimate medical explanation
exists.
2. Which professional must generally be a licensed physician to serve as an MRO
under DOT requirements?
A. Collector
B. DER
C. Medical Review Officer
D. SAP assistant
Answer: C. Medical Review Officer
Rationale: The MRO role requires a physician meeting applicable qualification
requirements.
3. What does DER stand for?
A. Drug Evaluation Reviewer
B. Designated Employer Representative
C. Drug Examination Registrar
D. Designated Employee Reviewer
Answer: B. Designated Employer Representative
Rationale: The DER is the employer's designated contact for specified
responsibilities within the workplace drug and alcohol testing program.
,4. Which party performs the analytical testing of a DOT specimen?
A. MRO
B. DER
C. Collector
D. Certified laboratory
Answer: D. Certified laboratory
Rationale: Laboratories perform the analytical procedures; the MRO subsequently
reviews applicable results.
5. What is the principal purpose of the MRO interview?
A. Determine employee salary
B. Explore relevant medical information that could explain the result
C. Decide employee discipline
D. Repeat the laboratory test personally
Answer: B. Explore relevant medical information that could explain the result
Rationale: The interview permits assessment of prescriptions, medical history,
and other relevant factors.
6. Which decision belongs primarily to the employer rather than the MRO?
A. Medical verification of a drug result
B. Evaluation of a prescription explanation
C. Employment discipline
D. Review of medical information
Answer: C. Employment discipline
Rationale: The MRO verifies the test result; employment consequences are
determined by the employer under applicable rules and policies.
7. What does CCF mean in DOT drug testing?
A. Certified Clinical Finding
B. Custody and Control Form
C. Collection Confirmation File
D. Controlled Chemical Form
,Answer: B. Custody and Control Form
Rationale: The CCF documents important information and custody events
associated with the specimen.
8. What is the purpose of chain-of-custody documentation?
A. Track specimen handling
B. Determine employee wages
C. Diagnose disease
D. Determine job classification
Answer: A. Track specimen handling
Rationale: Chain-of-custody documentation provides traceability from collection
through laboratory processing and reporting.
9. What is a split specimen?
A. Two unrelated specimens from two employees
B. A specimen divided into primary and split portions
C. A laboratory quality-control sample
D. A second blood sample
Answer: B. A specimen divided into primary and split portions
Rationale: The split portion provides an opportunity for additional testing under
applicable DOT procedures.
10. Which party is responsible for determining whether a laboratory-confirmed
drug finding has a legitimate medical explanation?
A. Collector
B. MRO
C. DER
D. Laboratory receptionist
Answer: B. MRO
Rationale: This is a central responsibility of the MRO's independent medical
review.
11. Which statement about MRO independence is most accurate?
A. The MRO should simply accept the employer's preferred result
, B. The MRO should independently evaluate the laboratory result and medical
evidence
C. The MRO should always favor the donor
D. The MRO should always favor the employer
Answer: B. The MRO should independently evaluate the laboratory result and
medical evidence
Rationale: Independent review protects the integrity of the testing process and
donor rights.
12. What should an MRO primarily consider when an employee reports taking a
medication?
A. The medication's color
B. Whether relevant medical information supports the explanation
C. The employee's job title
D. The employer's disciplinary preference
Answer: B. Whether relevant medical information supports the explanation
Rationale: The key issue is whether the medication and related medical facts
legitimately explain the laboratory result.
13. Which is NOT normally an MRO responsibility?
A. Reviewing laboratory results
B. Conducting medical interviews
C. Determining employee termination
D. Verifying medical explanations
Answer: C. Determining employee termination
Rationale: Employment decisions belong to the employer, not the MRO.
14. What does SAP stand for?
A. Substance Abuse Professional
B. Specimen Analysis Physician
C. Safety Assessment Provider
D. Substance Analysis Program
Answers & Detailed Rationales | Medical Review Officer
Questions 1–50: MRO Role, Responsibilities & Core Concepts
1. What is the primary function of a Medical Review Officer (MRO)?
A. Collect specimens
B. Independently review and verify laboratory drug-test results
C. Discipline employees
D. Operate laboratory instruments
Answer: B. Independently review and verify laboratory drug-test results
Rationale: The MRO provides an independent medical review of laboratory-
confirmed results and determines whether a legitimate medical explanation
exists.
2. Which professional must generally be a licensed physician to serve as an MRO
under DOT requirements?
A. Collector
B. DER
C. Medical Review Officer
D. SAP assistant
Answer: C. Medical Review Officer
Rationale: The MRO role requires a physician meeting applicable qualification
requirements.
3. What does DER stand for?
A. Drug Evaluation Reviewer
B. Designated Employer Representative
C. Drug Examination Registrar
D. Designated Employee Reviewer
Answer: B. Designated Employer Representative
Rationale: The DER is the employer's designated contact for specified
responsibilities within the workplace drug and alcohol testing program.
,4. Which party performs the analytical testing of a DOT specimen?
A. MRO
B. DER
C. Collector
D. Certified laboratory
Answer: D. Certified laboratory
Rationale: Laboratories perform the analytical procedures; the MRO subsequently
reviews applicable results.
5. What is the principal purpose of the MRO interview?
A. Determine employee salary
B. Explore relevant medical information that could explain the result
C. Decide employee discipline
D. Repeat the laboratory test personally
Answer: B. Explore relevant medical information that could explain the result
Rationale: The interview permits assessment of prescriptions, medical history,
and other relevant factors.
6. Which decision belongs primarily to the employer rather than the MRO?
A. Medical verification of a drug result
B. Evaluation of a prescription explanation
C. Employment discipline
D. Review of medical information
Answer: C. Employment discipline
Rationale: The MRO verifies the test result; employment consequences are
determined by the employer under applicable rules and policies.
7. What does CCF mean in DOT drug testing?
A. Certified Clinical Finding
B. Custody and Control Form
C. Collection Confirmation File
D. Controlled Chemical Form
,Answer: B. Custody and Control Form
Rationale: The CCF documents important information and custody events
associated with the specimen.
8. What is the purpose of chain-of-custody documentation?
A. Track specimen handling
B. Determine employee wages
C. Diagnose disease
D. Determine job classification
Answer: A. Track specimen handling
Rationale: Chain-of-custody documentation provides traceability from collection
through laboratory processing and reporting.
9. What is a split specimen?
A. Two unrelated specimens from two employees
B. A specimen divided into primary and split portions
C. A laboratory quality-control sample
D. A second blood sample
Answer: B. A specimen divided into primary and split portions
Rationale: The split portion provides an opportunity for additional testing under
applicable DOT procedures.
10. Which party is responsible for determining whether a laboratory-confirmed
drug finding has a legitimate medical explanation?
A. Collector
B. MRO
C. DER
D. Laboratory receptionist
Answer: B. MRO
Rationale: This is a central responsibility of the MRO's independent medical
review.
11. Which statement about MRO independence is most accurate?
A. The MRO should simply accept the employer's preferred result
, B. The MRO should independently evaluate the laboratory result and medical
evidence
C. The MRO should always favor the donor
D. The MRO should always favor the employer
Answer: B. The MRO should independently evaluate the laboratory result and
medical evidence
Rationale: Independent review protects the integrity of the testing process and
donor rights.
12. What should an MRO primarily consider when an employee reports taking a
medication?
A. The medication's color
B. Whether relevant medical information supports the explanation
C. The employee's job title
D. The employer's disciplinary preference
Answer: B. Whether relevant medical information supports the explanation
Rationale: The key issue is whether the medication and related medical facts
legitimately explain the laboratory result.
13. Which is NOT normally an MRO responsibility?
A. Reviewing laboratory results
B. Conducting medical interviews
C. Determining employee termination
D. Verifying medical explanations
Answer: C. Determining employee termination
Rationale: Employment decisions belong to the employer, not the MRO.
14. What does SAP stand for?
A. Substance Abuse Professional
B. Specimen Analysis Physician
C. Safety Assessment Provider
D. Substance Analysis Program
