Fractional Excretion of Sodium (FENa)

Distinguishes prerenal azotemia from intrinsic renal causes (e.g. ATN) in acute kidney injury.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

Urine SodiummEq/L

Plasma SodiummEq/L

Urine Creatininemg/dL

Plasma Creatininemg/dL

Enter the values above to see the result.

Source

Espinel CH. The FENa test. Use in the differential diagnosis of acute renal failure. JAMA. 1976;236(6):579-581.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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