1. What is the Bedside Schwartz Equation?

The Bedside Schwartz equation estimates glomerular filtration rate (GFR) in pediatric patients using height and serum creatinine. It is specifically validated for children and provides a reliable assessment of kidney function in this population.

2. How Does the Calculator Work?

The calculator uses the Bedside Schwartz equation:

Where:

• \( Height \) — Patient 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 uses height as a surrogate for muscle mass and creatinine production, providing a more accurate GFR estimation in growing children.

3. Importance of Pediatric eGFR Calculation

Details: Accurate GFR estimation in children is essential for diagnosing congenital kidney diseases, monitoring chronic kidney disease progression, and adjusting medication dosages appropriate for pediatric kidney function.

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Ensure both values are positive numbers. This calculator is specifically designed for pediatric patients (typically ages 1-18 years).

5. Frequently Asked Questions (FAQ)

Q1: What age range is this equation valid for?
A: The Bedside Schwartz equation is validated for children aged 1-18 years. For infants under 1 year, other equations may be more appropriate.

Q2: Why use height instead of weight in pediatric eGFR calculation?
A: Height correlates better with muscle mass and creatinine production in children, providing more stable GFR estimates during growth periods.

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: Less accurate in patients with extreme body habitus, malnutrition, muscle wasting diseases, or rapidly changing kidney function.

Q5: When should this equation not be used?
A: Avoid in neonates, pregnant adolescents, amputees, or when serum creatinine is changing rapidly.