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 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

For Children (SI Units)
Enter a numeric value of at least 0.001
Enter a numeric height of at least 0.1 centimeters (cm)
Estimated GFR value (mL/min/1.73 m²*)
mL/min/1.73 m²

*The NKDEP presently recommends reporting estimated GFR values for children greater than or equal to 75 mL/min/1.73 m² simply as “≥ 75 mL/min/1.73 m²,” not an exact number.

References

1. Schwartz GJ, et al. New equations to estimate GFR in children with CKD. J Am Soc Nephrol. 2009;20:629-637.

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.