Sodium FENa Calculator

Fractional Excretion of Sodium (FENa) is a mobile app designed to help health practitioner to calculate the fractional excretion of sodium (FENa). This FENa score is used to determine if acute renal failure is due to pre-renal, intrinsic, or post-renal pathology. FENa score less than 1% is associated with pre-renal pathology, eg hypovolemia, heart failure, renal artery stenosis, sepsis (anything causing decreased effective renal perfusion). FENa score more than 4% is associated with post-renal pathology or obstruction, eg BPH, bladder stone, bilateral ureter obstruction. While FENa score between 1-4% is associated with intrinsic pathology eg ATN, AIN, glomerulonephritides. FENa score is calculated from 4 parameters, namely serum creatinine, urinary creatinine, serum sodium, and urinary sodium.

All calculations must be re-checked and should not be used alone to guide patient care, nor should they substitute for clinical judgment. Calculations in this app might be different with your local practice. Consult to expert doctor whenever necessary.