What FEUrea indicates pre-renal AKI?

FEUrea 50% suggests intrinsic renal disease (ATN).

Why is FEUrea better with diuretics?

Loop diuretics block NaCl reabsorption, raising FENa artificially. Urea reabsorption is unaffected by loop diuretics, so FEUrea remains a valid marker.

What is the formula for FEUrea?

FEUrea = (Urine Urea × Serum Creatinine) / (Serum Urea × Urine Creatinine) × 100. Values in same units.

Fractional Excretion of Urea (FEUrea) Calculator

Calculate FEUrea to differentiate pre-renal from intrinsic AKI — preferred over FENa when diuretics have been given.

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Fractional Excretion of Urea (FEUrea) Calculator

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Frequently Asked Questions

What FEUrea indicates pre-renal AKI?

Why is FEUrea better with diuretics?

What is the formula for FEUrea?