FENa Calculator

Free calculate FENa (Fractional Excretion of Sodium). This is an educational tool only - always consult a healthcare provider.

Laboratory Values

Results

Enter lab values to calculate FENa

About FENa

  • • FENa = (Urine Na × Serum Cr) / (Serum Na × Urine Cr) × 100
  • • <1%: Prerenal azotemia (volume depletion)
  • • >2%: ATN or other intrinsic renal disease
  • • 1-2%: Indeterminate