Using the adult Rule of Nines, what percentage of body surface area does the head represent?

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Multiple Choice

Using the adult Rule of Nines, what percentage of body surface area does the head represent?

Explanation:
In adults, the Rule of Nines assigns 9% of total body surface area to the head and neck. This quick method splits the body into large, approximate sections to estimate burn size, with the head/neck set at 9%, the trunk at 18% anterior and 18% posterior, each arm 9%, each leg 18%, and the perineum 1%. So burns to the head are counted as 9% TBSA. The other options don’t fit the adult distribution: 18% would be a larger region like an entire leg or the trunk, 4.5% isn’t a standard segment, and 27% would exceed the head’s share.

In adults, the Rule of Nines assigns 9% of total body surface area to the head and neck. This quick method splits the body into large, approximate sections to estimate burn size, with the head/neck set at 9%, the trunk at 18% anterior and 18% posterior, each arm 9%, each leg 18%, and the perineum 1%. So burns to the head are counted as 9% TBSA. The other options don’t fit the adult distribution: 18% would be a larger region like an entire leg or the trunk, 4.5% isn’t a standard segment, and 27% would exceed the head’s share.

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