√[(Height × Weight) / 3600]
Mosteller (1987)
BSA = √[(H × W) / 3600]
DuBois & DuBois (1916)
BSA = 0.007184 × H^0.725 × W^0.425
Haycock (1978)
BSA = 0.024265 × H^0.3964 × W^0.5378
H = Height (cm), W = Weight (kg)
Body Surface Area (BSA) is a measurement of the total surface area of the human body. It is an important physiological parameter used extensively in medicine for calculating drug dosages, especially for chemotherapy and other medications where precise dosing is critical. BSA provides a more accurate measure of metabolic mass than body weight alone because it accounts for both height and weight.
The average adult BSA is approximately 1.7 to 1.9 m² for women and 1.9 to 2.1 m² for men. However, BSA can vary significantly based on body composition, with athletes and larger individuals typically having higher BSA values. Understanding your BSA can be helpful for medical consultations and understanding medication dosing.
BSA is commonly used in clinical settings for several important applications:
- Chemotherapy Dosing: Most chemotherapy drugs are dosed based on BSA to ensure appropriate drug exposure while minimizing toxicity.
- Cardiac Index Calculation: The cardiac index (CI) is calculated by dividing cardiac output by BSA, providing a normalized measure of heart function.
- Renal Function Assessment: Glomerular filtration rate (GFR) is often normalized to BSA for accurate comparison across patients.
- Burn Assessment: The extent of burn injuries is often described as a percentage of total BSA to guide fluid resuscitation and treatment.
- Nutritional Assessment: BSA can be used to estimate caloric requirements and nutritional needs in clinical settings.
Medical Disclaimer
BSA calculations are estimates and should be used for informational purposes only. Consult a healthcare professional for accurate dosing or clinical decisions. Different formulas may yield slightly different results, and the appropriate formula may vary based on patient population and clinical context.