RenalNephrology

Fractional Excretion of Urea (FEUrea)

Differentiates pre-renal from intrinsic renal AKI, particularly useful when diuretics preclude interpretation of FENa.

Urine urea

mmol/L

Serum urea

mmol/L

Urine creatinine

µmol/L

Serum creatinine

µmol/L

Reference: Carvounis CP et al. Kidney Int 2002

Medical Disclaimer: This calculator is a clinical decision support tool for qualified healthcare professionals. It does not replace clinical judgement. Always interpret results in the full clinical context. Reference: Carvounis CP et al. Kidney Int 2002.

More Nephrology Calculators

RenalCockcroft-Gault

Estimates CrCl for drug dosing. Standard formula for renal dose adjustment (not for CKD staging).

RenalAnion Gap

Detects unmeasured anions in metabolic acidosis. Corrected for hypoalbuminaemia. Normal: 3–11 mEq/L.

RenalFENa

Differentiates pre-renal from intrinsic renal AKI. FENa < 1% = pre-renal. Invalid on diuretics — use FEUrea instead.

RenaleGFR (MDRD)

Estimates glomerular filtration rate from creatinine, age, and sex for CKD staging and monitoring.