Body Surface Area

Uses

• Renal function is usually fractioned over the BSA to gain an appreciation of the true required glomerular filtration rate (GFR);
• The Quetelet index uses a somewhat modified form of the BSA;
• The cardiac index is a measure of cardiac output divided by the BSA, giving a better approximation of the required cardiac output;
• Chemotherapy is often dosed according to the patient's BSA.
• Glucocorticoid dosing is also expressed in terms of BSA for calculating maintenance doses or to compare high dose use with maintenance requirement.

Calculation

$\{x\}=\; \backslash sqrt\backslash frac\{\backslash mbox\{weight\}\; \backslash times\; \backslash mbox\{height\}\; \}\{3600\}$

$\{x\}=\; \backslash sqrt\backslash frac\{\backslash mbox\{weight\}\; \backslash times\; \backslash mbox\{height\}\; \}\{3131\}$

$\{x\}=0.024265\; \backslash times\; \{weight(kg)\}^\{0.5378\}\; \backslash times\; \{height(kg)\}^\{0.3964\}$

$\{x\}=(71.84\; \backslash times\; \{weight(kg)\}^\{0.425\}\; \backslash times\; \{height(cm)\}^\{0.725\})/10000$

Normal values

• "Normal" BSA is generally taken to be 1.7 m².
• Average BSA for men: 1.9 m²
• Average BSA for women: 1.6 m²
• Average BSA for child (9 years): 1.07 m²
• Average BSA for child (10 years): 1.14 m²
• Average BSA for child (12-13 years): 1.33 m²

References

• Mosteller RD. Simplified calculation of body-surface area. N Engl J Med 1987;317:1098. PMID 3657876.

External link

• BC Cancer network BSA calculation guidelines.

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