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Renal Failure Index CalculatorFractional Excretion of Sodium Calculator
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Renal Failure Index Calculator   

Serum   Sodium  

Urine     Sodium  

Serum Creatinine 

Urine Creatinine  




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.


Top Use:    Calculating Renal Failure Index - Serum Sodium:133mmol/L Urine Sodium:80mmol/L Urine Creatinine:7.2mg/dL Serum Creatinine:2.75mg/dL

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