Currently the best equation for estimating glomerular filtration rate (GFR) from serum creatinine in children is the Bedside Schwartz equation for use with creatinine methods with calibration traceable to IDMS1, 2. All laboratories should be using creatinine methods calibrated to be IDMS traceable. Read more about creatinine standardization. Using the original Schwartz equation with a creatinine value from a method with calibration traceable to IDMS will overestimate GFR by 20 to 40%.
This Bedside IDMS-traceable Schwartz GFR calculator should be used when Scr is reported in µmol/L.
GFR (mL/min/1.73 m2) = (36.2 × Height in cm) / Creatinine in µmol/L