GFR Calculator Pediatric Formula

Pediatric GFR Formula:

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

Estimated GFR (eGFR):

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1. What is the Pediatric GFR Formula?

The Pediatric GFR Formula estimates glomerular filtration rate (GFR) in children using height and serum creatinine. This simplified formula provides a quick and reliable assessment of kidney function in pediatric populations.

2. How Does the Calculator Work?

The calculator uses the Pediatric GFR formula:

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

Where:

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

Explanation: This formula leverages the direct relationship between height and muscle mass, and the inverse relationship between creatinine and kidney function in children.

3. Importance of Pediatric GFR Calculation

Details: Accurate GFR estimation in children is essential for detecting early kidney dysfunction, monitoring chronic kidney disease progression, and adjusting medication dosages appropriately for pediatric patients.

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Ensure both values are positive and measured accurately for reliable results.

5. Frequently Asked Questions (FAQ)

Q1: What age range is this formula appropriate for?
A: This formula is typically used for children aged 1-18 years, though validation may vary by specific pediatric population.

Q2: How does this compare to Schwartz formula?
A: This is a simplified version that provides quick estimates, while Schwartz formula includes additional factors and is more widely validated.

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 in healthy children.

Q4: When should creatinine be measured in children?
A: Morning samples are preferred, and testing should avoid periods of acute illness or recent meat consumption that could affect creatinine levels.

Q5: Are there limitations to this formula?
A: This formula may be less accurate in children with extreme body habitus, malnutrition, or rapidly changing kidney function.