American Board of Surgery Qualifying Exam (ABS QE) Practice Test

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Which region accounts for 9% body surface area in the rule of nines?

Each lower extremity
Each upper extremity
Back trunk
Head and neck

The correct answer is: Each upper extremity

In the context of the Rule of Nines, which is a method used to estimate the total body surface area (TBSA) affected by burns, each upper extremity indeed accounts for 9% of the body surface area. This rule assists in rapidly assessing burn extent and determining fluid resuscitation needs in burn patients. The body is divided into sections, each representing a percentage of total body surface area. Specifically, the upper extremities (each arm) make up 9% of the TBSA, while the lower extremities are allocated a larger percentage due to their size. Other regions such as the back trunk and head and neck have different percentages, with the back trunk comprising 18% and the head and neck accounting for 9%. Understanding these percentages is crucial for effective burn management and treatment protocols.