(41C) Body Surface Area (BSA)

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a modest contribution, from the HP 33S Applications in Medicine:
Application 2: Body Surface Area (BSA)
There are two primary methods used to estimate body surface area, the Dubois method and the Boyd Method. Each method uses inputs of a patient’s height and weight in metric units and estimates the patient’s BSA.
Dubois’ formula is shown below in Figure 6 and requires input of the height in centimeters and the weight in kilograms.

BSA(m²) = Ht⁰·⁷²⁵ x Wt⁰·⁴²⁵ x 0.007184 Figure 6

Note that Dubois’ formula is undefined for children with a BSA less than 0.6 m2. Boyd’s formula should be used in these situations.

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