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Fractional Excretion of Urea

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Calculates the Fractional Excretion of Sodium. FEUrea = (PCr * Uurea) / (Purea x UCr). <20: Pre Renal ; >40: Intrinsic Renal ; >40: Post Renal

Range Description Category
<20 Pre Renal good
20-40 Intrinsic Renal intermediate
≥40 Post Renal bad 
FENa = (a * d) / (c * b)
1. Plasma Creatinine (from BMP) mg/dL
2. Urine Creatinine mg/dL
3. Plasma BUN (from BMP) mg/dL
4. Urine Urea mg/dL