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Fractional Excretion of Urea
Aka: Fractional Excretion of Urea, FEUrea
- See Also
- Acute Kidney Injury
- Fractional Excretion of Sodium (FENa)
- Indications
- Acute Kidney Injury
- Distinguishes Prerenal Failure from instrinsic Renal Failure (e.g. Acute Tubular Necrosis)
- Alternative to Fractional Excretion of Sodium (FENa) as it is not altered by Diuretic use
- Calculation
- Fractional Excretion of Urea (FEUrea in percent) = (sCr * uUrea) / (sUrea x uCr) * 100
- Where
- sCr: Serum Creatinine
- uCr: Urine Creatinine
- sUrea: Serum Urea (Blood Urea Nitrogen)
- uUrea: Urine Urea
- Interpretation: Fractional Excretion of Urea (FEUrea)
- FEUrea <35%: Prerenal Failure
- FEUrea >50%: Intrinsic renal disease (e.g. Acute Tubular Necrosis)
- References
- Carvounis (2002) Kidney Int 62: 2223-9 [PubMed]