1. What is the Haycock BSA Formula?

The Haycock formula is one of several equations used to estimate body surface area (BSA) from weight and height. It's particularly useful in pediatric and oncology settings for calculating drug dosages and other medical parameters.

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.

3. Importance of BSA Calculation

Details: BSA is used to calculate drug dosages (especially chemotherapy), fluid requirements, and to normalize various physiological measurements. It's more accurate than weight-based dosing for many medications.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why use Haycock instead of other BSA formulas?
A: The Haycock formula is considered more accurate for both children and adults compared to some older formulas like DuBois.

Q2: What are typical BSA values?
A: Average BSA is about 1.7 m² for adult men and 1.6 m² for adult women. Neonates have about 0.25 m².

Q3: When should BSA be used for drug dosing?
A: BSA-based dosing is common for chemotherapy, some antibiotics, and other drugs with narrow therapeutic windows.

Q4: Are there limitations to BSA calculations?
A: BSA formulas may be less accurate in extremely obese or cachectic patients. Clinical judgment should always be used.

Q5: Should I use kg/cm or lbs/inches?
A: The calculator requires metric units (kg and cm). Convert pounds to kg (1 lb = 0.453592 kg) and inches to cm (1 in = 2.54 cm) if needed.