TEN Nefrologia Practice Questions - TEN - Título De Especialista Em Nefrologia (Sociedade Brasileira De Nefrologia AMB) Exam

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A 54-year-old woman with severe gastroenteritis and dehydration presents with lethargy, orthostatic hypotension, and oliguria. Laboratory workup reveals: Serum Sodium = 140 mEq/L, Serum Creatinine = 3.0 mg/dL (baseline 0.8 mg/dL), Urine Sodium = 12 mEq/L, and Urine Creatinine = 120 mg/dL. What is the calculated Fractional Excretion of Sodium (FENa), and which etiology of acute kidney injury does this finding support?

FENa = 0.21%, supporting prerenal azotemia FENa = 2.14%, supporting acute tubular necrosis (ATN) FENa = 4.20%, supporting acute interstitial nephritis FENa = 0.85%, supporting contrast-induced nephropathy

Correct Answer:

FENa = 0.21%, supporting prerenal azotemia

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