Nephrology · Internal Medicine · ICU and Critical Care

Fractional Excretion of Sodium (FENa) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Urine sodium

mmol/L

Allowed range: 1–300 mmol/L

Plasma sodium

mmol/L

Allowed range: 100–180 mmol/L

Urine creatinine

mg/dL

Allowed range: 1–500 mg/dL

Plasma creatinine

mg/dL

Allowed range: 0.1–30 mg/dL

Result

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Clinical inputs

Urine sodium (mEq/L)Accepted range: 1 to 300
Plasma sodium (mEq/L)Accepted range: 100 to 180
Urine creatinine (mg/dL)Accepted range: 1 to 500
Plasma creatinine (mg/dL)Accepted range: 0.1 to 30

Primary source

Espinel CH. The FENa test. Use in the differential diagnosis of acute renal failure. JAMA. DOI: 10.1001/jama.1976.03270160045030. PMID: 947239. Scope: FENa (%) = 100 × (UNa × PCr) / (PNa × UCr). (1976)

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