Fractional Excretion Urea (FEUrea)
Urea excretion is not thought to be promoted by diuretics yet is still retained in volume depleted states. Fractional Excretion of Urea (FEUrea) = ( Uurea * PCr ) / ( Purea * UCr ) * 100
| Urine urea (Uurea): | mmol/L |
| Plasma creatinine (PCr): | µmol/L |
| Plasma urea/BUN (Purea): | mmol/L |
| Urine creatinine (UCr): | µmol/L |
| Fractional Excretion of Urea (FEUrea): | % |
A FEUrea less than 35% indicates pre-renalazotemia, while a FEUrea > 35% is indicative of intrinsic renal failure.
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References:
Ishir Bhan, MD MPH. “Nephromatic: Fractional Excretion”. Nephromatic. http://www.nephromatic.com/fractional_excretion.php (04 June, 2012)
Carvounis CP, Nisar S, Guro-Razuman S. “Significance of the fractional excretion of urea in the differential diagnosis of acute renal failure.”. Kidney Int. 2002 Dec;62(6):2223-9. PubMed PMID: 12427149.
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