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FENA

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Calculates the Fractional Excretion of Sodium. FENa = (PCr * UNa) / (PNa x UCr). <1: Pre Renal ; >1: Intrinsic Renal ; >4: Post Renal

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