All calculations must be re-checked by hand and should not be used alone to guide patient care. See disclaimer for more. Light green = required. Once required data is entered, click anywhere for results.

Equations

Scores

Fractional Excretion of Urea (FEUrea)

  Units: US SI
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).