The "rule of nines" is a method of determining the percent of body surface area in a part of the body.

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The "rule of nines" is a commonly used method to estimate the percentage of total body surface area (TBSA) affected by burns or other injuries. It divides the body into regions that represent multiples of 9% of TBSA, with the head and neck, each arm, the chest, abdomen, upper back, lower back and buttocks, and each leg representing 9% or multiples of 9%.

The "Rule of Nines" Is a Method of Determining the Percent