Calculate eGFR in Children

Bedside Schwartz Equation:

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

Estimated GFR (eGFR):

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1. What is the Bedside Schwartz Equation?

The Bedside Schwartz equation is a simplified formula used to estimate glomerular filtration rate (GFR) in children. It uses height and serum creatinine to provide a quick and reliable assessment of kidney function in pediatric patients.

2. How Does the Calculator Work?

The calculator uses the Bedside Schwartz equation:

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

Where:

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

Explanation: The equation provides a simple bedside calculation that correlates well with measured GFR in children, making it practical for clinical use.

3. Importance of eGFR Calculation in Children

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

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Both values must be positive numbers. The calculator is specifically designed for pediatric use.

5. Frequently Asked Questions (FAQ)

Q1: What age range is this equation appropriate for?
A: The Bedside Schwartz equation is validated for children from 1 to 16 years of age.

Q2: Why is height used in pediatric eGFR calculations?
A: Height serves as a surrogate for muscle mass in children, which correlates with creatinine production and thus provides better GFR estimation.

Q3: What are normal eGFR values in children?
A: Normal eGFR in children varies by age but generally ranges from 90-140 mL/min/1.73m², with higher values in younger children.

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

Q5: Can this equation be used for infants?
A: For infants under 1 year, other equations (like the original Schwartz equation with different coefficients) may be more appropriate.