1. What is the Bedside Schwartz Equation?

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

2. How Does the Calculator Work?

The calculator uses the Bedside Schwartz equation:

Where:

• \( Height \) — Height in centimeters (cm)
• \( Scr \) — Serum creatinine in milligrams per deciliter (mg/dL)
• \( 0.413 \) — Empirical constant derived from pediatric population studies

Explanation: The equation leverages the relationship between height (as a proxy for muscle mass) and creatinine production to estimate GFR in children.

3. Importance of Pediatric eGFR Calculation

Details: Accurate GFR estimation in children is essential for diagnosing kidney disease, monitoring treatment response, adjusting medication doses, and assessing growth and development related 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. Use recent laboratory values for optimal accuracy.

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: Why is height used instead of weight in this equation?
A: Height correlates better with muscle mass and creatinine production in children, making it a more stable parameter for GFR estimation.

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. Values should be interpreted in context with age-specific norms.

Q4: Are there limitations to this equation?
A: The equation may be less accurate in children with extreme body habitus, malnutrition, muscle wasting diseases, or rapidly changing kidney function.

Q5: How often should eGFR be monitored in children?
A: Frequency depends on clinical context - typically every 3-12 months for stable chronic kidney disease, more frequently during acute illness or treatment changes.