1. What is the Haycock Formula?

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

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 crucial for determining medication dosages, chemotherapy regimens, fluid requirements, and for normalizing various physiological measurements in pediatric patients.

4. Using the Calculator

Tips: Enter weight in kilograms and height in centimeters. Both values must be positive numbers. For infants, use precise measurements for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: Why use Haycock instead of Dubois formula for children?
A: The Haycock formula was specifically developed and validated for pediatric populations and provides more accurate estimates for children.

Q2: What is the normal BSA range for children?
A: BSA varies significantly with age and growth. Newborns typically have BSA of about 0.2 m², increasing to adult values (1.6-1.9 m²) by late adolescence.

Q3: When should BSA be calculated?
A: BSA should be calculated whenever precise dosing is required for medications with narrow therapeutic windows, especially in chemotherapy.

Q4: Are there limitations to this formula?
A: The formula may be less accurate in extremely obese or cachectic children, and in neonates. Clinical judgment should always be used.

Q5: Should this be used for drug dosing in all cases?
A: While BSA is commonly used for pediatric dosing, some medications may require adjustment based on weight or other factors. Always follow prescribing guidelines.