# Calculating Fractional Excretion of Sodium,FENa Calculator

The fractional sodium excretion (FENa) is a measure of the extraction of sodium from the glomerular filtrate. This calculator estimates FENa according to the concentrations of sodium and creatinine in the blood and urine.
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 Renal Failure Index Calculator Fractional Excretion of Sodium Calculator #nav{position:fixed; top:20px; left:30px;width:86px;height: 67px; border:1px solid #aaa;display: none;background: #fafafa;padding-left: 8px;padding-right: 8px;padding-top: 12px}
 Renal Failure Index Calculator    Serum   Sodium   mEq/Lmmol/LUrine     Sodium   mEq/Lmmol/LSerum Creatinine  mg/dLµmol/LUrine Creatinine   mg/dLmmol/L Fractional Excretion of Sodium The urinary indices are the the renal failure index (RFI) and the fractional sodium excretion (FENa).FENa is the percentage of the sodium filtered by the kidney that is excreted in the urine. It determines if renal failure is due to pre-renal, intrinsic, or post-renal pathology. The fractional excretion of sodium equation: FENa= UNa*SCr*100/(SNa*UCr) Where: FENa=The fractional excretion of sodium(%) UNa=Urine Sodium(mEq/L) SCr=Serum creatinine(mg/dl) UCr=Urine creatinine(mg/dl) SNa=Urine Sodium(mEq/L) Abnormal FENa levels A FENa of less than 1% strongly suggests a prerenal state such as dehydration or other forms of prerenal azotemia. A FENa between 1% and 2% could be either disorder. A FENa higher than 2% indicates an intrinsic problem with the kidneys themselves, such as ATN.