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 provides a quick and practical assessment of kidney function in paediatric patients using only height and serum creatinine measurements.

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 paediatric population studies

Explanation: This equation simplifies the original Schwartz formula for easier clinical use while maintaining reasonable accuracy for paediatric GFR estimation.

3. Importance of Paediatric eGFR 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 paediatric patients.

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Ensure both values are positive and measured accurately. Height should be measured without shoes, and creatinine should be from a reliable laboratory measurement.

5. Frequently Asked Questions (FAQ)

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

Q2: How does this differ from the original Schwartz formula?
A: The original Schwartz formula used a coefficient of 0.55, while the bedside version uses 0.413 for improved accuracy and standardization.

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 very young infants, malnourished children, or those with extreme body composition. It should not be used in neonates.

Q5: When should this calculator not be used?
A: Avoid using for neonates, patients with rapidly changing kidney function, amputees, or when highly accurate GFR measurement is required for critical decisions.