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:

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 assumes a linear relationship between height/creatinine ratio and GFR, specifically validated for pediatric populations.

3. Importance of Pediatric eGFR Calculation

Details: Accurate GFR estimation in children is essential for detecting congenital kidney abnormalities, monitoring chronic kidney disease progression, adjusting medication doses, and evaluating growth and development impacts of renal function.

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Ensure both values are positive and measured accurately. This calculator is specifically designed for pediatric patients.

5. Frequently Asked Questions (FAQ)

Q1: What age range is this equation appropriate for?
A: The Bedside Schwartz equation is validated for children and adolescents, typically from 1 to 18 years of age.

Q2: What are normal eGFR values in children?
A: Normal eGFR in children varies by age and body size, but generally ranges from 90-140 mL/min/1.73m², with higher values in younger children.

Q3: How does this differ from the original Schwartz formula?
A: The Bedside Schwartz uses a constant of 0.413, while the original used 0.55. The bedside version is simplified for clinical use while maintaining reasonable accuracy.

Q4: Are there limitations to this equation?
A: Less accurate in very young infants (<1 year), patients with extreme body habitus, muscle wasting conditions, or rapidly changing kidney function.

Q5: When should creatinine be measured in children?
A: Morning samples are preferred. Avoid testing after recent illness, dehydration, or periods of rapid growth that may affect creatinine levels.