1. What is the Haycock Formula?

The Haycock formula is a widely used equation for estimating body surface area (BSA) in neonates and children. It provides a more accurate estimation for smaller body sizes compared to adult BSA formulas.

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 in neonatal care for determining medication dosages, fluid requirements, and nutritional needs. It's also used to assess growth and development.

4. Using the Calculator

Tips: Enter weight in kilograms and height in centimeters. For accurate results, measurements should be as precise as possible.

5. Frequently Asked Questions (FAQ)

Q1: Why use Haycock instead of other BSA formulas?
A: The Haycock formula was specifically developed for and validated in pediatric populations, making it more accurate for neonates than adult formulas like Du Bois.

Q2: What are typical BSA values for neonates?
A: Typical BSA ranges from about 0.2 m² for a 2.5 kg newborn to about 0.3 m² for a 4 kg newborn.

Q3: When should BSA be calculated?
A: BSA should be calculated whenever precise dosing of medications or fluids is required, especially for chemotherapy or critical care medications.

Q4: Are there limitations to this formula?
A: The formula may be less accurate in extremely premature infants or those with abnormal body proportions (e.g., edema, congenital anomalies).

Q5: How often should BSA be recalculated?
A: For rapidly growing neonates, BSA should be recalculated at least weekly, or whenever there's significant weight change (>5-10%).