The FENa Calculator determines the Fractional Excretion of Sodium, a crucial diagnostic tool for differentiating causes of acute kidney injury (AKI). Quickly assess if AKI is pre-renal or intrinsic with this simple, accurate medical calculator, aiding in timely diagnosis and treatment.
Formula:
The Fractional Excretion of Sodium (FENa) is calculated using the following formula:
FENa = (Urine Sodium × Serum Creatinine) / (Serum Sodium × Urine Creatinine) × 100
Where:
- Urine Sodium (UNa): Concentration of sodium in the urine (mEq/L)
- Serum Creatinine (SCr): Concentration of creatinine in the blood serum (mg/dL)
- Serum Sodium (SNa): Concentration of sodium in the blood serum (mEq/L)
- Urine Creatinine (UCr): Concentration of creatinine in the urine (mg/dL)
The result is expressed as a percentage (%).