Units: US SI

Fractional Excretion of Urea (FEUrea)

Serum BUN mEq/L
Urine Urea mEq/L
Serum Creatinine mg/dL
Urine Creatinine mg/dL
FEUrea %

Fractional Excretion of Urea (FEUrea) = (SerumCr * UUrea ) / (SerumUrea x UCr) %

This test can provide similar information to the FENa equation, but can still be used in patients on diuretic therapy (diuretics alter the sodium concentration, making the FENa equation unusable).

Posted in: Critical Care • Nephrology • Renal

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