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's derived from the original Schwartz formula and provides a quick, reliable estimate of kidney function in paediatric 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 population studies

Explanation: The equation assumes a linear relationship between height/creatinine ratio and glomerular filtration rate, with the constant 0.413 calibrated for paediatric populations.

3. Importance of Paediatric 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 in relation to kidney function.

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Ensure accurate height measurement and use recent creatinine values. The calculator is specifically validated for paediatric patients (typically ages 1-18 years).

5. Frequently Asked Questions (FAQ)

Q1: What age range is this calculator appropriate 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: How does this differ from the original Schwartz formula?
A: The Bedside Schwartz uses a simplified constant (0.413) instead of age and gender-specific constants, making it easier to use at the bedside while maintaining good accuracy.

Q3: 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. Values should be interpreted in context of the child's age and clinical condition.

Q4: When should this equation not be used?
A: Avoid using in patients with rapidly changing creatinine, amputees, very low muscle mass, or when extremely accurate GFR measurement is required for specific treatments.

Q5: How often should eGFR be monitored in children with kidney issues?
A: Frequency depends on the underlying condition, but typically every 3-6 months for stable chronic kidney disease, and more frequently during acute illness or treatment changes.