NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How is BSA (m2) calculated?

sq root of [Ht(cm) + wt (kg)/3600]
sq root of [Ht(cm) x wt (kg)/3600]
Ht(cm) * wt (kg)/3600
(Ht(cm) + wt (kg))^2/3600

The correct answer is: sq root of [Ht(cm) x wt (kg)/3600]

BSA (m2) is calculated using the Mosteller formula: the square root of [height (cm) x weight (kg) / 3600]. This formula is commonly used in clinical practice to estimate the body surface area, which is a crucial parameter for dosing certain medications, particularly chemotherapy drugs. By multiplying the height and weight and taking the square root of the result, a more accurate estimation of the body surface area is obtained. Option A is incorrect because it adds the height and weight before taking the square root. Option C is incorrect because it multiplies the height and weight without taking the square root. Option D is incorrect because it squares the sum of the height and weight without taking the square root. Therefore, the correct formula for calculating BSA using the Mosteller method is the square root of [height (cm) x weight (kg) / 3600], which is represented by Option B.