Nephrology · Internal Medicine · ICU and Critical Care

Fractional Excretion of Urea (FEUrea) calculator

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

Clinical inputs

Urine urea

mg/dL

Allowed range: 1–3000 mg/dL

Plasma urea

mg/dL

Allowed range: 1–300 mg/dL

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 urea (mg/dL)Accepted range: 1 to 3000
Plasma urea (mg/dL)Accepted range: 1 to 300
Urine creatinine (mg/dL)Accepted range: 1 to 500
Plasma creatinine (mg/dL)Accepted range: 0.1 to 30

Primary source

Carvounis CP et al. Significance of the fractional excretion of urea in the differential diagnosis of acute renal failure. Kidney Int. DOI: 10.1046/j.1523-1755.2002.00633.x. PMID: 12427149. Scope: FEUrea (%) = 100 × (UUrea × PCr) / (PUrea × UCr); ≤35% favors prerenal azotemia. (2002)

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