Renal

Fractional Excretion of Sodium

Differentiates prerenal vs intrinsic renal AKI

Calculate FENa

Urine Na (mEq/L)

Serum Na (mEq/L)

Urine Creatinine (mg/dL)

Serum Creatinine (mg/dL)

Estimated glomerular filtration rate using CKD-EPI 2021 equation (race-free)

Estimated creatinine clearance for drug dosing

Free water deficit in hypernatremia

In AttendMe.ai, the FENa calculator auto-detects from your clinical questions — alongside evidence from 3M+ peer-reviewed articles.