Pediatric GFR Calculator
Calculate estimated glomerular filtration rate (eGFR) using the bedside Schwartz formula. Choose the coefficient that fits your patient.
0.55 works for most children of both sexes.
Results
Estimated GFR
110.0 mL/min/1.73 m²
Coefficient k = 0.55. Height 120.0 cm; creatinine 0.60 mg/dL.
How to Use This Calculator
Measure height accurately
Height must be in centimeters; recumbent length for infants.
Use calibrated creatinine values
IDMS-traceable creatinine assays align best with Schwartz coefficients.
Select appropriate coefficient
Choose the category that matches age/sex to apply the correct k value.
Formula
eGFR (mL/min/1.73 m²) = (k × height in cm) / serum creatinine (mg/dL)
Source: Schwartz GJ et al., Pediatrics 2009 (Bedside Schwartz equation) and later consensus statements.
Frequently Asked Questions
When should I adjust the k value?
Use 0.55 for children and adolescent females, 0.7 for adolescent males. For muscular teens, 0.7 may better reflect muscle mass.
Does this work with Jaffe creatinine?
The equation assumes IDMS-standardized creatinine. For Jaffe assays, consider calibration adjustments.
What if GFR is <60?
Persistently low eGFR (<60 mL/min/1.73 m²) warrants nephrology referral and evaluation for chronic kidney disease.
Can I use SI units?
Convert creatinine to µmol/L by multiplying mg/dL by 88.4, then adjust the equation accordingly.
Do I need to index to BSA?
The equation outputs GFR normalized to 1.73 m². For actual GFR, multiply by (BSA/1.73).