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In the rule of nines, what percentage is assigned to an adult's back?

  1. 9%

  2. 18%

  3. 27%

  4. 36%

The correct answer is: 18%

In the rule of nines, which is a method used to estimate the total body surface area (TBSA) affected by burns, the back of an adult is assigned a percentage of 18%. This percentage is part of a larger framework that divides the body into sections, where each area corresponds to a specific percentage of the total body surface area. For an adult, the front and back of the torso each account for 18%, making the total for the torso (front plus back) 36%. This system allows for quick assessments in emergency situations, facilitating decisions regarding fluid resuscitation and other urgent care needs for burn patients.