NRCME Urinalysis and Renal Disorders 1 — Questions and Answers
Question 1: According to FMCSA regulations, which of the following is routinely checked during the DOT urinalysis as part of the commercial driver physical examination?
- Creatinine clearance only
- Sugar, albumin, and specific gravity (Correct answer)
- Complete metabolic panel
- Urine culture and sensitivity
Correct answer: Sugar, albumin, and specific gravity
The DOT urinalysis per 49 CFR 391.43 requires testing for sugar (glucose), albumin (protein), and specific gravity as a basic dipstick screen.
Question 2: A CMV driver's urinalysis shows 2+ glucose. What is the most appropriate next step for the medical examiner?
- Immediately disqualify the driver
- Certify the driver without restriction
- Investigate further for diabetes mellitus before making a certification decision (Correct answer)
- Refer the driver for a urine culture
Correct answer: Investigate further for diabetes mellitus before making a certification decision
Glycosuria requires further investigation for diabetes mellitus; glucose alone does not automatically disqualify a driver, but its underlying cause must be evaluated.
Question 3: What is the clinical significance of finding persistent proteinuria (albumin 2+ or greater) on a DOT urinalysis in a commercial driver?
- It indicates the driver consumed excess protein before the exam
- It may signal underlying renal disease requiring further evaluation (Correct answer)
- It is a normal finding in drivers over age 50
- It automatically qualifies the driver for a 2-year certificate
Correct answer: It may signal underlying renal disease requiring further evaluation
Persistent proteinuria may indicate underlying chronic kidney disease or other renal pathology and requires further workup before certification.
Question 4: Which specific gravity range is considered within normal limits during a DOT physical urinalysis?
- 1.001–1.005
- 1.010–1.030 (Correct answer)
- 1.035–1.045
- 1.050–1.060
Correct answer: 1.010–1.030
A specific gravity of 1.010–1.030 reflects normal urine concentration; values outside this range may indicate renal concentrating defects or over-hydration.
Question 5: A commercial driver undergoing a DOT physical has a urinalysis positive for blood (hematuria). What should the medical examiner do?
- Certify the driver for 1 year and schedule a follow-up
- Disqualify the driver permanently
- Investigate the cause of hematuria before making a certification decision (Correct answer)
- Ignore the finding if the driver reports no symptoms
Correct answer: Investigate the cause of hematuria before making a certification decision
Hematuria must be investigated to rule out significant urologic or renal pathology before the examiner can make an appropriate certification decision.
Question 6: A CMV driver is found to have ketonuria on urinalysis during the DOT physical. In which clinical scenario is this finding most medically significant?
- Drivers who ate a high-protein meal that morning
- Drivers with uncontrolled or undiagnosed Type 1 diabetes (Correct answer)
- Drivers who exercised vigorously the previous day
- Drivers taking calcium supplements
Correct answer: Drivers with uncontrolled or undiagnosed Type 1 diabetes
Ketonuria combined with glycosuria is a hallmark of uncontrolled Type 1 diabetes or diabetic ketoacidosis, both of which raise significant safety concerns for CMV operation.
Question 7: Which statement best describes the purpose of the urinalysis in the FMCSA commercial driver medical examination?
- It serves as a federally mandated drug screening test
- It detects alcohol impairment at the time of the exam
- It screens for medical conditions that may affect driving safety (Correct answer)
- It replaces the need for blood pressure measurement
Correct answer: It screens for medical conditions that may affect driving safety
The DOT urinalysis is a medical screening tool to detect conditions such as diabetes and renal disease that could impair driving safety, not a regulated drug test.
NRCME Urinalysis and Renal Disorders 1
According to FMCSA regulations, which of the following is routinely checked during the DOT urinalysis as part of the commercial driver physical examination?