Acute renal failure differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Aarti Narayan, M.B.B.S [2]

Overview

Various parameters like fractional sodium excretion, urinary sodium concentration, urine osmolality and U/P creatinine ratio have been used to diagnose acute renal failure. The fractional sodium excretion is identifies as the most effective non-invasive test in formulating the differential diagnosis of acute renal failure .

Differentiating Acute renal failure from other Diseases

• FENa more than 1:
  • Acute tubular necrosis
  • Non-oliguric acute tubular necrosis
  • Acute urinary tract obstruction
• FENa less than 1:
  • Acute glomerulonephritis
  • Pre-renal azotemia