The rule of nines.

    The severity of a burn injury is based on the amount of surface area covered in deep partial-thickness, full-thickness, and subdermal burns. The rule of nines method allows reasonable estimation. Because of the difference in body habitus (particularly head and neck), the rule of nines must be altered in children.

Head and neck	9%
Upper extremities	9% each
Chest (anterior and posterior)	9% each
Abdomen	9%
Lower back	9%
Lower extremities	18% each
Perineum	1%

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