Schwartz Pediatric GFR Calculator
Calculate estimated GFR in children using the Schwartz formula with age-appropriate k constants.
Patient Details
k constant: 0.45
Result
Enter the values and click Calculate.
Estimated GFR
—
mL/min/1.73 m²
CKD Stage
—
Formula used
eGFR = k × Height / Creatinine
Results are estimates for educational reference only. Clinical decisions require a licensed healthcare provider and confirmation of the creatinine assay method (enzymatic vs. Jaffe vs. IDMS).
Schwartz k Constant Reference
| Age / Group | k Value | Notes |
|---|---|---|
| Preterm infant | 0.33 | Lower muscle mass, gestational correction needed |
| Full-term infant (≤1 year) | 0.45 | Both sexes |
| Child (2–12 years) | 0.55 | Both sexes |
| Adolescent girl (13–18 years) | 0.55 | Lower muscle mass than males |
| Adolescent boy (13–18 years) | 0.70 | Higher muscle mass at puberty |
Summary
Calculate estimated GFR in children using the Schwartz formula with age-appropriate k constants.
How it works
- Select the patient age group (and sex where relevant) to determine the correct k constant.
- Enter the child's height in centimeters.
- Enter the serum creatinine level in mg/dL.
- The calculator applies eGFR = k × Height (cm) / Serum Creatinine (mg/dL).
- Results are displayed in mL/min/1.73 m² with a CKD stage interpretation.
Use cases
- Screening for chronic kidney disease (CKD) in pediatric patients.
- Monitoring kidney function in children with known renal conditions.
- Calculating drug dosing adjustments in pediatric nephrology.
- Tracking eGFR trends over time in children with recurrent UTIs or other renal conditions.
- Educational tool for medical students learning pediatric renal physiology.
- Supporting clinical decisions in neonatal intensive care units.
Frequently Asked Questions
Last updated: 2026-06-09 ·
Reviewed by Nham Vu