Estimate glomerular filtration rate from common lab inputs.
Overview
Estimated glomerular filtration rate (eGFR) is a standard indicator used to assess kidney filtration function. It is commonly interpreted alongside serum creatinine and clinical context.
GFR equations use age, sex, and creatinine values to approximate filtration per body surface standard. Results guide screening and follow-up discussions, not standalone diagnosis.
This calculator helps translate lab values into interpretable ranges, but medical decisions require physician review and complete health history.
Steps
Provide age and sex as required by equation parameters.
Use lab value with correct units.
Apply available equation framework used by your clinic.
Tool estimates filtration rate per 1.73 m^2 body surface area.
Interpret result with urinalysis, trends, and medical history.
Math
eGFR often follows CKD-EPI style equation using creatinine, age, and sex-specific constants
Modern equations apply piecewise scaling of creatinine with demographic coefficients to estimate filtration function standardized to body surface area.
Worked cases
Apply chosen eGFR equation constants
Estimated GFR falls in generally normal-to-mildly reduced range context dependent.
Higher Scr lowers estimated filtration result
Estimated GFR suggests reduced function needing clinical follow-up.
Compare serial values over time
Trend may be more informative than one isolated reading.
Why use this
Questions