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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)