Fractional Excretion of Urea (FEUrea) is a acute kidney injury tool commonly applied in Nephrology. FEUrea (%) = (Urine urea × Serum Cr) / (Serum urea × Urine Cr) × 100. Often used when diuretics reduce FENa reliability. Use the interactive calculator for inputs, limitations, and primary references.

Not a substitute for clinical judgment. Verify critical values with primary literature, local protocols, and specialist input when appropriate.