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 assessment than other formulas for pediatric patients, using weight and height measurements.

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: Accurate BSA estimation is crucial for pediatric drug dosing, chemotherapy regimens, fluid requirements, and nutritional assessments in 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 and validated for pediatric populations, providing more accurate results than adult formulas like Du Bois.

Q2: What are typical BSA values for children?
A: Newborns average about 0.25 m², increasing with age. Average values are 0.5 m² at 1 year, 0.7 m² at 5 years, and 1.0 m² at 10 years.

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

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

Q5: Should this be used for adult patients?
A: While it can be used for adults, other formulas like Du Bois or Mosteller may be more commonly used in adult populations.