MRO Study Guide 2026
Everything you need to pass the MRO exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 MRO Exam Format at a Glance
📚 MRO Topics to Study (63)
✍️ Sample MRO Questions & Answers
1. Under 49 CFR Part 40, which change to a CCF requires the MRO to document a 'corrective action memorandum' in the testing record?
When a correctable flaw is remedied, the MRO must prepare and retain a memorandum for record explaining the discrepancy and its correction.
2. Which of the following best describes the MRO's obligation regarding confidentiality during the donor interview process?
The MRO must maintain confidentiality throughout the interview process, disclosing only the verified result and required information to authorized parties as specified by 49 CFR Part 40.
3. Under contract closeout, how should the MRO handle requests from a new employer who has hired a safety-sensitive employee from the closing employer?
DOT regulations allow previous MROs to release testing records to a new employer in a safety-sensitive industry upon written request with appropriate authorization.
4. A laboratory modifies its reporting procedure and begins providing MROs with quantitative results for all drug classes. How does this affect MRO decision-making for DOT-regulated tests?
Under DOT rules, quantitative results help MROs assess whether detected levels are consistent with a claimed prescription, but do not change the positive/negative binary reporting structure.
5. What is the minimum number of days an HHS-certified laboratory must retain a negative urine specimen before discarding?
Under 49 CFR Part 40, laboratories must retain negative specimens for a minimum of 5 business days (approximately 7 calendar days), but common practice and some guidelines extend this to 30 days—the regulatory minimum is 5 business days; however, the standard answer referenced in MRO training is 7 days.
6. What is the primary purpose of a final billing reconciliation during MRO contract closeout?
Final billing reconciliation ensures every billed test is supported by a corresponding CCF record and that all financial obligations between the employer and MRO are settled.