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Nephrology
Calculate the Fractional Excretion of Sodium (FENa) to differentiate pre-renal azotemia (FENa <1%) from intrinsic renal disease such as ATN (FENa >2%) in acute kidney injury.
Formula
FENa (%) = (Urine Na × Serum Cr) / (Serum Na × Urine Cr) × 100
Inputs
Clinical
Calculate estimated glomerular filtration rate (eGFR) using the CKD-EPI 2021 race-free equation. Free kidney function assessment with CKD staging from serum creatinine.
Formula
CKD-EPI 2021: 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^-1.200 × 0.9938^Age × (1.012 if female)
Inputs