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Fractional Excretion of Sodium: Sensitivity and Specificity


Fractional excretion of sodium: (urine Na / urine Cr) / (plasma Na / plasma Cr). In the context of acute renal failure, generally <1% is indicative of prerenal causes while >2% is indicative of ATN.

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Associated Diagnoses:

Bulimia Nervosa

37% sensitive, 95% specific

Prerenal Kidney Failure

76.6% sensitive, 96% specific

Syndrome of Inappropriate ADH Secretion

68% sensitive, 100% specific