Fractional Excretion of Urea

Identify a pre-renal state in patients using diuretics


A fractional excretion of urea (FEUrea) of < 35% is suggestive of pre-renal azotemia. Unlike when measuring of the fractional excretion of sodium, (FENa), it can be used even when patients are taking diuretics.

Fractional Exceretion of Urea = Uur X Pcreat / Ucreat X Pur · 100%


  • Uur = Urine urea
  • Pcreat = Plasma creatinine
  • Ucreat = Urine creatinine
  • Pur = Plasma urea


The Fractional Excretion of Urea calculator is created by QxMD.

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1. Urine Urea?

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