Fractional Excretion of Urea Calculator

Respiratory
1 minute

Determine the FEUrea by entering the requested values, such as serum urea (BUN), serum creatinine, urine urea, and urine creatinine.

BUN
mmol/L
Creatinine
μmol/L
Urine Urea
mmol/L
Urine Creatinine
μmol/L
Urine Creatinine
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    3 Number of calculations
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    The fractional excretion of urea is a renal physiology parameter that helps assess how the kidneys are handling urea, a waste product of protein metabolism. This parameter can be useful in diagnosing and monitoring various kidney disorders.

    FEU_{rea} = \left(\frac{UUN \cdot Cr_S}{BUN \cdot Cr_U}\right) \times 100

    Results:

    • FEUrea ≤35% indicates prerenal failure;
    • FEUrea >50% indicates intrinsic renal disease.