1. What is the Haycock Formula?

The Haycock formula is one of several equations used to estimate body surface area (BSA) from weight and height. It was specifically developed for pediatric populations and provides accurate BSA estimates for children.

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 dimensions and surface area, with different exponents for weight and height.

3. Importance of BSA Calculation

Details: BSA is used in many medical applications including chemotherapy dosing, fluid requirements, nutritional assessments, and determining appropriate medication doses for children.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why use Haycock instead of other BSA formulas?
A: The Haycock formula was specifically developed for pediatric populations and has been validated in children, making it more accurate for this age group than adult formulas.

Q2: What are normal BSA values for children?
A: BSA varies significantly with age and growth. Newborns typically have BSA around 0.2-0.3 m², while adolescents may approach adult values (1.6-1.9 m²).

Q3: When should BSA be calculated?
A: BSA should be calculated whenever precise dosing is required for medications that are dosed by body surface area, particularly in oncology and critical care.

Q4: Are there limitations to this formula?
A: The formula may be less accurate in extremely obese or cachectic children. In these cases, consult with a specialist for appropriate dosing adjustments.

Q5: Can this be used for drug dosing?
A: Yes, this formula is commonly used for chemotherapy and other medications that require BSA-based dosing in children.