Work out egfr (mdrd) instantly with clear inputs, formula shown and shareable results.
Uses the four-variable IDMS-traceable MDRD study equation to estimate glomerular filtration rate normalised to 1.73 square metres.
MDRD (IDMS-traceable)
eGFR = 175 x Scr^-1.154 x age^-0.203 x 0.742 (if female) x 1.212 (if Black)
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Most guidelines now recommend race-free equations such as CKD-EPI 2021; the coefficient is included here for legacy comparison.
Above about 60 mL/min/1.73m2, where it systematically underestimates true GFR.