Urinalysis and Renal Disorders Flashcards

A CMV driver's urinalysis shows a specific gravity of 1.001. Which condition does this most likely indicate?

Answer: Diabetes insipidus or overhydration

A specific gravity of 1.001 indicates very dilute urine, consistent with diabetes insipidus or excessive fluid intake.

Under FMCSA regulations, a driver with an eGFR of 45 mL/min/1.73m² (Stage 3b CKD) should be:

Answer: Referred for specialist evaluation before certification decision

Stage 3b CKD requires specialist evaluation to assess stability, risk of progression, and cardiovascular risk before the ME makes a certification decision.

Which urinalysis finding is MOST associated with rhabdomyolysis in a commercial driver?

Answer: Myoglobinuria causing brown/tea-colored urine

Rhabdomyolysis releases myoglobin into the bloodstream, which is filtered by the kidneys producing brown or tea-colored urine on dipstick.

A driver reports taking ibuprofen daily for back pain. What renal concern should the NRCME examiner prioritize?

Answer: NSAID-induced nephropathy causing declining eGFR

Chronic NSAID use can cause analgesic nephropathy and progressive decline in renal function that may disqualify the driver.

On urinalysis, waxy casts are MOST indicative of:

Answer: Advanced chronic renal failure with slow urine flow

Waxy casts form from degenerated granular casts in tubules with very slow flow, indicating advanced chronic renal disease.

A driver with polycystic kidney disease (PKD) applies for DOT certification. The examiner's MAIN concern is:

Answer: Progressive renal failure, hypertension, and associated intracranial aneurysm risk

PKD is associated with progressive CKD, hypertension, and a significant risk of intracranial berry aneurysms that can cause sudden incapacitation.

Which finding on urine microscopy is pathognomonic for acute glomerulonephritis?

Answer: Red blood cell casts

Red blood cell casts are pathognomonic for glomerulonephritis, indicating bleeding within the glomerulus itself.