Pediatric GFR Calculator
Calculate Glomerular Filtration Rate in children using established pediatric equations
Patient Information
Recommended for ages 1-18 years
Required for CKiD equation calculation
Standing height measurement
Standardized serum creatinine level
For cystatin-based and combined equations
Required for combined CKiD equation
Input Warnings
GFR Calculations
Bedside Schwartz Equation (2009)
Primary MethodCystatin C-based Equation (2012)
ConfirmatoryCombined CKiD Equation (2012)
Most ComprehensiveExample Calculations
10-Year-Old Child
Height: 140 cm (1.4 m)
Serum Creatinine: 0.7 mg/dL
Schwartz GFR: 41.3 × (1.4 / 0.7) = 82.6 mL/min/1.73m²
Interpretation: Kidney damage with mild loss of function
Healthy 8-Year-Old
Height: 125 cm (1.25 m)
Serum Creatinine: 0.5 mg/dL
Schwartz GFR: 41.3 × (1.25 / 0.5) = 103.3 mL/min/1.73m²
Interpretation: Normal kidney function
GFR Interpretation
Normal
No kidney damage or mild damage with normal function
Mild Loss
Kidney damage with mild loss of function
Moderate Loss
Mild to moderate loss of function
Severe Loss
Moderate to severe loss of function
Very Severe
Severe loss of kidney function
Kidney Failure
Kidney failure - dialysis/transplant needed
Calculation Methods
Bedside Schwartz (2009)
Standard method, ages 1-18 years
Cystatin C-based (2012)
Alternative when creatinine fluctuates
Combined CKiD (2012)
Most comprehensive, uses multiple parameters
Understanding Pediatric GFR
What is GFR?
Glomerular Filtration Rate (GFR) measures how well the kidneys filter blood. In children, kidney function assessment requires age-specific calculations that account for growth and development. The unit mL/min/1.73m² standardizes results to body surface area.
Why Use Pediatric-Specific Equations?
- •Children have different muscle mass affecting creatinine levels
- •Growth and development influence kidney function
- •Height is a better predictor than weight in children
- •Adult equations overestimate GFR in pediatric patients
Calculation Methods
Bedside Schwartz (2009)
GFR = 41.3 × (height in meters / serum creatinine)
Primary method for ages 1-18. Updated formula provides more accurate results than earlier versions.
Cystatin C-based (2012)
eGFR = 70.69 × Cystatin C^(-0.931)
Useful when creatinine levels are fluctuating or unreliable.
Clinical Note: Always consider clinical context when interpreting GFR results. Trends over time are often more important than single measurements.
Related Pediatric Calculators
Important Medical Disclaimer
This calculator is provided for educational and informational purposes only. It should not be used as a substitute for professional medical advice, diagnosis, or treatment. Pediatric kidney function assessment requires clinical expertise and should always be interpreted by qualified healthcare professionals in the context of the patient's overall clinical picture. GFR calculations are screening tools and may not reflect actual kidney function in all cases. Always consult with a pediatric nephrologist for comprehensive kidney function evaluation in children.