Child eGFR Calculator

Child eGFR Equation:

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

Estimated GFR (eGFR):

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1. What is the Child eGFR Equation?

The Child eGFR equation estimates glomerular filtration rate (GFR) in pediatric patients using serum creatinine and height. This simplified formula provides a quick assessment of kidney function in children and is particularly useful in clinical settings where rapid evaluation is needed.

2. How Does the Calculator Work?

The calculator uses the Child eGFR equation:

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

Where:

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

Explanation: The equation utilizes the inverse relationship between serum creatinine and GFR, while incorporating height as a proxy for body surface area in pediatric patients.

3. Importance of Pediatric eGFR Calculation

Details: Accurate GFR estimation in children is essential for detecting congenital kidney abnormalities, monitoring nephrotoxic medications, and managing chronic kidney disease progression in pediatric populations.

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. The calculator is designed for pediatric patients (typically 1-18 years).

5. Frequently Asked Questions (FAQ)

Q1: What age range is this equation appropriate for?
A: This equation is primarily validated for children aged 1-18 years. For infants under 1 year, specialized equations should be used.

Q2: How does this compare to Schwartz formula?
A: While the Schwartz formula is more widely used, this simplified equation provides quick estimates and correlates well with more complex pediatric GFR equations.

Q3: What are normal eGFR values in 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 equation may be less accurate in children with extreme body habitus, malnutrition, or rapidly changing kidney function.

Q5: When should this calculation be used?
A: Use for screening and monitoring purposes. For precise clinical decisions, consider more comprehensive pediatric GFR assessment methods.