Determines if renal failure is due to prerenal or intrinsic pathology.
Fractional Excretion of Sodium (FENa) Calculator
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Fractional Excretion of Sodium (FENa): %
Please provide valid positive values for all inputs. Urine Creatinine cannot be zero.
Interpretation of FENa:
- FENa < 1%: Suggests prerenal azotemia (kidneys are trying to conserve sodium and water due to decreased blood flow).
- FENa > 2%: Suggests intrinsic renal failure (e.g., acute tubular necrosis), where the kidneys are unable to conserve sodium effectively.
- FENa between 1-2%: Indeterminate, may require further evaluation.
Note: FENa may be misleading in certain conditions (e.g., diuretic use, chronic kidney disease).
