GFR Calculator for Children

Bedside IDMS-traceable Schwartz GFR Calculator for Children (SI units)

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 IDMS^{1, 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 S_cr is reported in µmol/L.

GFR (mL/min/1.73 m²) = (36.2 × Height in cm) / Creatinine in µmol/L

References

1.Schwartz GJ, Muñoz A, Schneider MF, et al. New equations to estimate GFR in children with CKD. J Am Soc Nephrol. 2009:20(3):629-37.

2.Schwartz GJ and Work DF. Measurement and estimation of GFR in children and adolescents. Clin J Am Soc Nephrol. 2009; 4 (11): 1832-43.