182 Burn: Rule of Nines The Body Is Divided into Multiples of Nine Head and neck 9% Each upper extremity, 9% (i.e., 9 × 2) (front and back) 18% Each lower extremity, 18% (i.e., 18 × 2) (front and back) 36% Each anterior and posterior trunk surface, 18% (i.e., 18 × 2) 36% Perineum and genitalia 1% 100%
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