In adults, the most widely-used equations for estimating glomerular filtration rate (GFR) from serum creatinine are the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation1 and the isotope dilution mass spectrometry (IDMS) traceable Modification of Diet in Renal Disease (MDRD) Study equation2. NKDEP’s calculators rely on creatinine determinations which are isotope dilution mass spectrometry (IDMS) traceable. All laboratories should be using creatinine methods calibrated to be IDMS traceable. Read more about creatinine standardization.
This IDMS-traceable MDRD study equation calculator is for use with Scr reported in mg/dL. This equation should not be used when eGFR values above 60 mL/min/1.73 m2 are desired.
GFR (mL/min/1.73 m2) = 175 x (Scr)-1.154 x (Age)-0.203 x (0.742 if female) x (1.212 if African American) (conventional units)
The equation does not require weight because the results are reported normalized to 1.73 m2 body surface area, which is an accepted average adult surface area.