NRCME Urinalysis and Renal Disorders 2 — Questions and Answers
Question 1: A CMV driver has been diagnosed with Stage 3 chronic kidney disease (eGFR 30–59 mL/min/1.73m²) but is otherwise stable and asymptomatic. What is the most appropriate certification approach?
- Permanent disqualification regardless of stability
- Certify for up to 2 years with no follow-up needed
- Evaluate overall functional status and consider shorter certification with monitoring (Correct answer)
- Immediate referral for dialysis before any certification
Correct answer: Evaluate overall functional status and consider shorter certification with monitoring
Stage 3 CKD does not automatically disqualify a driver; the examiner should assess functional capacity, symptom burden, and medications, and may issue a shorter-term certificate with specialist follow-up.
Question 2: A commercial driver on maintenance hemodialysis for end-stage renal disease (ESRD) applies for a DOT medical certificate. Which of the following statements is most accurate?
- Dialysis patients are automatically certified for 1 year
- ESRD requiring dialysis generally disqualifies a driver due to the unpredictable nature of the condition (Correct answer)
- Dialysis is only disqualifying if sessions occur more than three times per week
- The driver may be certified if sessions are scheduled on weekends only
Correct answer: ESRD requiring dialysis generally disqualifies a driver due to the unpredictable nature of the condition
ESRD requiring dialysis typically disqualifies a CMV driver because the condition causes fatigue, electrolyte imbalances, and unpredictable medical events incompatible with safe driving.
Question 3: Which urinalysis finding is most consistent with a urinary tract infection (UTI) in a commercial driver during a DOT physical?
- Specific gravity of 1.025
- Positive nitrites and leukocyte esterase (Correct answer)
- Glucose 1+ with no protein
- Specific gravity of 1.005 only
Correct answer: Positive nitrites and leukocyte esterase
Positive nitrites (indicating bacterial reduction) and leukocyte esterase (indicating white blood cells) are classic dipstick markers of a urinary tract infection.
Question 4: A CMV driver taking an ACE inhibitor for proteinuric chronic kidney disease presents for his DOT physical. What is the medical examiner's primary concern regarding this medication?
- ACE inhibitors are not approved for CMV drivers under any circumstances
- The examiner must assess whether the drug causes hypotension or other side effects that impair driving (Correct answer)
- ACE inhibitors automatically extend the certification period to 3 years
- The medication negates the need for urinalysis
Correct answer: The examiner must assess whether the drug causes hypotension or other side effects that impair driving
ACE inhibitors can cause hypotension, dizziness, and other side effects; the examiner must evaluate whether these effects impair the driver's ability to safely operate a CMV.
Question 5: During a DOT physical, a urinalysis reveals bilirubin in the urine. What should the medical examiner suspect?
- Renal tubular acidosis
- Hepatic or biliary disease affecting liver function (Correct answer)
- Benign prostatic hyperplasia
- Dehydration artifact only
Correct answer: Hepatic or biliary disease affecting liver function
Bilirubinuria indicates that conjugated bilirubin is appearing in the urine, which suggests hepatic or biliary pathology such as hepatitis, cirrhosis, or biliary obstruction.
Question 6: A commercial driver with a solitary functioning kidney and a normal eGFR, no proteinuria, and well-controlled blood pressure presents for DOT certification. What is the appropriate action?
- Permanent disqualification — one kidney is always disqualifying
- Certify for up to 2 years if renal function is normal and the driver is otherwise qualified (Correct answer)
- Certify only for interstate driving, not intrastate
- Require a Federal exemption before any certification can be issued
Correct answer: Certify for up to 2 years if renal function is normal and the driver is otherwise qualified
A single kidney is not automatically disqualifying; if the remaining kidney functions normally and no other disqualifying conditions are present, the driver may be certified for the standard 2-year period.
Question 7: When a DOT urinalysis shows very low specific gravity (1.001–1.003), which condition should the examiner consider?
- Dehydration and urinary concentration
- Diabetes insipidus or polydipsia affecting urine dilution (Correct answer)
- Urinary tract infection
- Acute kidney injury from rhabdomyolysis
Correct answer: Diabetes insipidus or polydipsia affecting urine dilution
A very low specific gravity suggests the kidneys cannot concentrate urine, raising concern for diabetes insipidus, excessive fluid intake, or renal concentrating defects.
