1. What is the Haycock BSA Formula?

The Haycock formula is a widely used equation for estimating body surface area (BSA) in pediatric patients. It provides a more accurate estimation than older formulas like Du Bois, especially for children and infants.

2. How Does the Calculator Work?

The calculator uses the Haycock formula:

Where:

• \( W \) — Weight in kilograms (kg)
• \( H \) — Height in centimeters (cm)
• \( BSA \) — Body surface area in square meters (m²)

Explanation: The formula accounts for the non-linear relationship between body size and surface area, with different exponents for weight and height.

3. Importance of BSA Calculation

Details: BSA is crucial for determining medication dosages, chemotherapy regimens, fluid requirements, and for assessing growth and nutritional status in pediatric patients.

4. Using the Calculator

Tips: Enter weight in kilograms and height in centimeters. All values must be valid (weight > 0, height > 0). For infants, use precise measurements.

5. Frequently Asked Questions (FAQ)

Q1: Why use Haycock instead of Du Bois formula?
A: The Haycock formula was derived from direct measurements in children and provides better accuracy for pediatric populations.

Q2: What are typical BSA values for children?
A: Newborns average 0.2-0.3 m², increasing with age. Adult values (1.6-1.9 m²) are typically reached in adolescence.

Q3: When should BSA be calculated?
A: For all pediatric medication dosing, chemotherapy, and when precise fluid management is required.

Q4: Are there limitations to this formula?
A: Less accurate in extremes of body habitus (very obese or cachectic patients) and for premature infants.

Q5: Should this be used for adult patients?
A: While valid, Mosteller's formula (√[height(cm)×weight(kg)/3600]) is more commonly used for adults due to its simplicity.