Cert Nephrology(SA) Phys Practice Questions - Sub-specialty Certificate In Nephrology Of The College Of Physicians Of South Africa Exam

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A 68-year-old male with chronic heart failure on daily furosemide presents with acute oliguria and an elevated serum creatinine of 210 µmol/L. Which diagnostic parameter is most reliable to distinguish prerenal azotemia from intrinsic acute tubular necrosis (ATN) in this patient?

Urine specific gravity > 1.020 Fractional excretion of sodium (FENa) < 1% Fractional excretion of urea (FEUrea) < 35% Urine sodium concentration < 20 mmol/L

Correct Answer:

Fractional excretion of urea (FEUrea) < 35%

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