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Total body surface area (TBSA) is an assessment measure of burns of the skin. The rule of nines is used to determine the total percentage of area burned for each major section of the body.

Adults Anatomic structure Surface area Head 9% Anterior torso 18% Posterior torso 18% Each leg 18% Each arm 9% Genitalia/perineum 1%

Children Anatomic structure Surface area Head 18% Anterior torso 18% Posterior torso 18% Each leg 14% Each arm 9% Genitalia/perineum 1%

Sometimes the genitalia is not counted separately with the 1% assigned to the neck.