Fractional Sodium Excretion
PNa: (any)
PCreat: (any)
UNa: (any)
UCreat: (any)

FENa:
%
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Warning! This site it targeted at medical professionals and medical students only. No claims are made of the accuracy of this calculator. Always confirm the results of this calculator before use. Never use the results of this calculator alone as a guide to patient care, always trust your clinical judgement. The authors of this calculator shall not be liable for damages resulting from use of this calculator.

This calculator calculates fractional sodium excretion (FENa) using this standard equation:

FENa = 100 * (Na_urinary * Creat_plasma) / (Na_plasma * Creat_urinary)

When using the same units consistently, both mg/dl and mmol/l can be used.

Interpretation of results:

FENa Interpretation
<1% Prerenal disease with decreased renal perfusion, causing salt retention.
>3% Kidney damage due to various causes, causing salt wasting.

References: