1. What is the Bedside Schwartz Equation?

The Bedside Schwartz equation is a simplified version of the original Schwartz formula used to estimate glomerular filtration rate (GFR) in children. It provides a quick and practical method for assessing kidney function in pediatric patients using only height and serum creatinine.

2. How Does the Calculator Work?

The calculator uses the Bedside Schwartz equation:

Where:

• \( Height \) — Patient's 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 calibrated for pediatric populations.

3. Importance of Pediatric eGFR Calculation

Details: Accurate GFR estimation in children is essential for diagnosing and monitoring chronic kidney disease, adjusting medication dosages, and evaluating growth and development in relation to kidney 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 calculator appropriate for?
A: The Bedside Schwartz equation is validated for children and adolescents aged 1-18 years.

Q2: How does this differ from the original Schwartz equation?
A: The Bedside Schwartz uses a constant of 0.413, while the original uses 0.55. The bedside version is simpler and more practical for clinical use.

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 very low muscle mass, amputees, or those with rapidly changing kidney function. Not validated for infants under 1 year.

Q5: When should this calculator not be used?
A: Avoid using in neonates, patients with extreme body habitus, or when very precise GFR measurement is required for critical decisions.