MEDICAL REVIEW OFFICER (MRO) ACTUAL EXAM 2026/2027
ACCURATE TEST COMPLETE ACTUAL QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES (100% CORRECT
VERIFIED SOLUTIONS) LATEST UPDATED VERSION 2026 EDITION
|GUARANTEED PASS A+ (BRAND NEW!) |FULL REVISED MEDICAL
REVIEW OFFICER (MRO) EXAM
1. A donor provides a urine specimen that splits into two valid portions. The
primary specimen result is reported by the laboratory as adulterated. As the MRO,
your first action should be to:
A) Report the result as a verified adulterated test.
B) Contact the donor to discuss the finding and gather information about
possible medical explanations. (CORRECT ANSWER)
Rationale: The MRO must interview the donor before verifying an adulterated
result, as certain medical conditions or treatments could potentially explain the
finding. Direct contact allows the donor to provide information before a final
determination is made.
C) Immediately notify the employer of the adulterated result.
D) Request a recollection under direct observation.
2. Under DOT regulations, which of the following is a legitimate medical
explanation for a laboratory report of “invalid result” due to abnormal pH?
A) Recent ingestion of large quantities of red meat.
,B) Use of a prescription carbonic anhydrase inhibitor such as acetazolamide.
(CORRECT ANSWER)
Rationale: Acetazolamide can alter urinary pH. An invalid result requires MRO
assessment; if a legitimate medical explanation exists, the MRO may verify the test
as negative/canceled rather than invalid.
C) Consumption of energy drinks 24 hours before testing.
D) OTC vitamin C supplementation.
3. Which of the following confirms that a urine specimen is dilute but not
necessarily adulterated?
A) Creatinine of 5 mg/dL and specific gravity of 1.003.
B) Creatinine of 10 mg/dL and specific gravity of 1.002. (CORRECT ANSWER)
*Rationale: DOT defines dilute as creatinine between 2-20 mg/dL AND specific
gravity <1.003. Both values here meet dilute criteria without automatic
adulteration.*
C) Creatinine of 25 mg/dL and specific gravity of 1.008.
D) Creatinine of 1 mg/dL and specific gravity of 1.001.
4. A donor’s laboratory report shows codeine at 2,500 ng/mL and morphine at
6,000 ng/mL. Which statement is correct?
A) This confirms illicit heroin use.
,B) The morphine-to-codeine ratio is >2:1, consistent with possible heroin
metabolism. (CORRECT ANSWER)
Rationale: In heroin use, morphine exceeds codeine (typical ratio >2:1). Although
other opiates could also produce this pattern, the MRO must consider prescription
morphine or codeine; clinical correlation is needed.
C) This pattern only occurs with poppy seed ingestion.
D) The MRO should report positive for codeine only.
5. A donor admits using a cannabidiol (CBD) product labeled “THC-free.” The
initial immunoassay for marijuana metabolites is positive at 55 ng/mL, and the
confirmatory GC-MS shows 20 ng/mL of delta-9-THC-COOH. What is the correct
MRO action?
A) Verify the test as positive for marijuana because the confirmatory level
exceeds the 15 ng/mL DOT/SAMHSA cutoff. (CORRECT ANSWER)
Rationale: Even if the donor believes the product is THC-free, the laboratory’s
GC-MS result above cutoff is definitive. The MRO must report positive; no
medical explanation negates a true positive.
B) Report negative due to possible contamination.
C) Cancel the test as invalid.
D) Call the donor to schedule a retest without reporting.
, 6. Which of the following best describes the role of the MRO in a direct
observation collection?
A) The MRO must be present during the void.
B) The MRO determines if the observed collection was warranted based on
previous results or reasonable suspicion. (CORRECT ANSWER)
Rationale: The MRO does not perform collections but may review circumstances
and documentation; the decision to use direct observation is typically made by
employer/collector based on DOT rules (e.g., invalid result, previous adulteration).
C) The MRO overrides the collector’s observation decision.
D) The MRO performs validity testing on the spot.
7. Under federal workplace drug testing programs, an MRO may verify a test as
negative even with a confirmed positive result if:
A) The donor refuses to discuss the result.
B) The donor provides a prescription for a different controlled substance.
C) The donor presents a valid prescription for a medication that explains the
result AND the testing is not a DOT “direct observation” refusal scenario.
(CORRECT ANSWER)
Rationale: A legitimate prescription for the detected substance (e.g., oxycodone for
pain) allows the MRO to verify as negative if the substance is not specifically
prohibited. For DOT, certain substances (e.g., amphetamines without prescription)
cannot be verified negative.
ACCURATE TEST COMPLETE ACTUAL QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES (100% CORRECT
VERIFIED SOLUTIONS) LATEST UPDATED VERSION 2026 EDITION
|GUARANTEED PASS A+ (BRAND NEW!) |FULL REVISED MEDICAL
REVIEW OFFICER (MRO) EXAM
1. A donor provides a urine specimen that splits into two valid portions. The
primary specimen result is reported by the laboratory as adulterated. As the MRO,
your first action should be to:
A) Report the result as a verified adulterated test.
B) Contact the donor to discuss the finding and gather information about
possible medical explanations. (CORRECT ANSWER)
Rationale: The MRO must interview the donor before verifying an adulterated
result, as certain medical conditions or treatments could potentially explain the
finding. Direct contact allows the donor to provide information before a final
determination is made.
C) Immediately notify the employer of the adulterated result.
D) Request a recollection under direct observation.
2. Under DOT regulations, which of the following is a legitimate medical
explanation for a laboratory report of “invalid result” due to abnormal pH?
A) Recent ingestion of large quantities of red meat.
,B) Use of a prescription carbonic anhydrase inhibitor such as acetazolamide.
(CORRECT ANSWER)
Rationale: Acetazolamide can alter urinary pH. An invalid result requires MRO
assessment; if a legitimate medical explanation exists, the MRO may verify the test
as negative/canceled rather than invalid.
C) Consumption of energy drinks 24 hours before testing.
D) OTC vitamin C supplementation.
3. Which of the following confirms that a urine specimen is dilute but not
necessarily adulterated?
A) Creatinine of 5 mg/dL and specific gravity of 1.003.
B) Creatinine of 10 mg/dL and specific gravity of 1.002. (CORRECT ANSWER)
*Rationale: DOT defines dilute as creatinine between 2-20 mg/dL AND specific
gravity <1.003. Both values here meet dilute criteria without automatic
adulteration.*
C) Creatinine of 25 mg/dL and specific gravity of 1.008.
D) Creatinine of 1 mg/dL and specific gravity of 1.001.
4. A donor’s laboratory report shows codeine at 2,500 ng/mL and morphine at
6,000 ng/mL. Which statement is correct?
A) This confirms illicit heroin use.
,B) The morphine-to-codeine ratio is >2:1, consistent with possible heroin
metabolism. (CORRECT ANSWER)
Rationale: In heroin use, morphine exceeds codeine (typical ratio >2:1). Although
other opiates could also produce this pattern, the MRO must consider prescription
morphine or codeine; clinical correlation is needed.
C) This pattern only occurs with poppy seed ingestion.
D) The MRO should report positive for codeine only.
5. A donor admits using a cannabidiol (CBD) product labeled “THC-free.” The
initial immunoassay for marijuana metabolites is positive at 55 ng/mL, and the
confirmatory GC-MS shows 20 ng/mL of delta-9-THC-COOH. What is the correct
MRO action?
A) Verify the test as positive for marijuana because the confirmatory level
exceeds the 15 ng/mL DOT/SAMHSA cutoff. (CORRECT ANSWER)
Rationale: Even if the donor believes the product is THC-free, the laboratory’s
GC-MS result above cutoff is definitive. The MRO must report positive; no
medical explanation negates a true positive.
B) Report negative due to possible contamination.
C) Cancel the test as invalid.
D) Call the donor to schedule a retest without reporting.
, 6. Which of the following best describes the role of the MRO in a direct
observation collection?
A) The MRO must be present during the void.
B) The MRO determines if the observed collection was warranted based on
previous results or reasonable suspicion. (CORRECT ANSWER)
Rationale: The MRO does not perform collections but may review circumstances
and documentation; the decision to use direct observation is typically made by
employer/collector based on DOT rules (e.g., invalid result, previous adulteration).
C) The MRO overrides the collector’s observation decision.
D) The MRO performs validity testing on the spot.
7. Under federal workplace drug testing programs, an MRO may verify a test as
negative even with a confirmed positive result if:
A) The donor refuses to discuss the result.
B) The donor provides a prescription for a different controlled substance.
C) The donor presents a valid prescription for a medication that explains the
result AND the testing is not a DOT “direct observation” refusal scenario.
(CORRECT ANSWER)
Rationale: A legitimate prescription for the detected substance (e.g., oxycodone for
pain) allows the MRO to verify as negative if the substance is not specifically
prohibited. For DOT, certain substances (e.g., amphetamines without prescription)
cannot be verified negative.
