Pediatric GFR Calculator Kidney Foundation

Kidney Foundation Pediatric Equation:

\[ eGFR = 0.413 \times \frac{Height}{Scr} \]

Estimated GFR (eGFR):

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1. What is the Kidney Foundation Pediatric GFR Equation?

The Kidney Foundation pediatric equation estimates glomerular filtration rate (GFR) in children using height and serum creatinine. This simplified formula is specifically designed for pediatric populations and provides a quick assessment of kidney function.

2. How Does the Calculator Work?

The calculator uses the Kidney Foundation pediatric equation:

\[ eGFR = 0.413 \times \frac{Height}{Scr} \]

Where:

\( Height \) — Patient's height in centimeters (cm)
\( Scr \) — Serum creatinine in milligrams per deciliter (mg/dL)
0.413 — Empirical coefficient derived from pediatric population studies

Explanation: This equation leverages the direct relationship between height and muscle mass, and the inverse relationship between creatinine and kidney function in pediatric patients.

3. Importance of Pediatric GFR Calculation

Details: Accurate GFR estimation in children is essential for detecting congenital kidney abnormalities, monitoring kidney function in pediatric nephrology patients, and guiding appropriate medication dosing for children with renal impairment.

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Ensure accurate height measurement and use recent creatinine values for reliable results. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What age range is this equation appropriate for?
A: This equation is typically used for children aged 1-18 years, though it may be applied to younger infants with caution.

Q2: How does this differ from adult GFR equations?
A: Pediatric equations account for the relationship between height and muscle mass development, which differs significantly from adult physiology.

Q3: What are normal eGFR values for children?
A: Normal pediatric eGFR values vary by age and body size, but generally range from 90-140 mL/min/1.73m², with higher values in younger children.

Q4: Are there limitations to this equation?
A: This simplified equation may be less accurate in children with extreme body habitus, malnutrition, or rapidly changing kidney function.

Q5: When should more complex equations be used?
A: For precise clinical decision-making, consider using validated pediatric-specific equations like Schwartz or updated Bedside Schwartz equations.