Quickly determine the Fractional Excretion of Sodium (FENa) with our online calculator. This vital tool helps differentiate between pre-renal azotemia and acute tubular necrosis (ATN) in patients with acute kidney injury (AKI) by assessing renal sodium handling. Enter your patient's urine and plasma values for immediate, accurate results.
Formula:
The Fractional Excretion of Sodium (FENa) is calculated using the following formula:
FENa = (Urine Sodium × Plasma Creatinine) / (Plasma Sodium × Urine Creatinine) × 100
- UNa = Urine Sodium (mEq/L)
- PNa = Plasma Sodium (mEq/L)
- UCr = Urine Creatinine (mg/dL)
- PCr = Plasma Creatinine (mg/dL)
The FENa percentage helps differentiate causes of acute kidney injury (AKI).