Globalrph BSA Multi Calculator

Mosteller Formula (Main):

\[ BSA = \sqrt{\frac{W \times H}{3600}} \]

BSA (Mosteller):

BSA (Du Bois):

BSA (Gehan & George):

BSA (Boyd):

BSA (Fujimoto):

BSA (Takahira):

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1. What is Body Surface Area (BSA)?

BSA is the measured or calculated surface area of the human body. It's used in many medical contexts including medication dosing, chemotherapy regimens, and physiological measurements.

2. Mosteller Formula

The Mosteller formula is the simplest and most commonly used BSA calculation:

\[ BSA = \sqrt{\frac{W \times H}{3600}} \]

Where:

\( W \) — Weight in kilograms
\( H \) — Height in centimeters

Advantages: Simple to calculate, easy to remember, and validated in many clinical studies.

3. Other BSA Formulas

Du Bois Formula: The original BSA formula developed in 1916:

\[ BSA = 0.007184 \times W^{0.425} \times H^{0.725} \]

Gehan & George Formula: Developed from 3D body scans:

\[ BSA = 0.0235 \times H^{0.42246} \times W^{0.51456} \]

Boyd Formula: Developed for pediatric populations:

\[ BSA = 0.0003207 \times H^{0.3} \times (1000 \times W)^{0.7285 - (0.0188 \times \log_{10}(1000 \times W))} \]

4. Clinical Applications

Details: BSA is used for calculating cardiac index, chemotherapy doses, glomerular filtration rate (GFR), and many other physiological measurements.

5. Frequently Asked Questions (FAQ)

Q1: Which formula is most accurate?
A: Mosteller is most commonly used, but the "best" formula depends on population and purpose. Most formulas agree within 5% for most adults.

Q2: Why use BSA instead of weight for drug dosing?
A: Many physiological processes correlate better with surface area than weight alone, especially for drugs with narrow therapeutic windows.

Q3: What are normal BSA values?
A: Average is about 1.7 m² for adult men and 1.6 m² for adult women, but varies significantly with height and weight.

Q4: Should BSA be adjusted for obesity?
A: Some clinicians use adjusted body weight for obese patients, but this is controversial and depends on the specific medication.

Q5: How does BSA change with age?
A: BSA peaks in late adolescence/early adulthood and may decline slightly with advanced age due to height loss and muscle mass reduction.