Emergency Medical Technician (EMT) Trauma Practice Test

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A 40-year-old man has burns to the entire head, anterior chest, and both anterior upper extremities. Using the adult Rule of Nines, what percentage of his total body surface area has been burned?

  1. 18%

  2. 27%

  3. 36%

  4. 45%

The correct answer is: 18%

The adult Rule of Nines is a method used to estimate the percentage of total body surface area (%TBSA) affected by burns. According to this rule, the head accounts for 9%, the anterior chest for 18%, and each anterior upper extremity for 9% of the total body surface area. This gives a total of 36% (%TBSA) for the burns on the head, anterior chest, and both anterior upper extremities. Therefore, the closest option to this percentage is A 18%. All of the other options are incorrect because they either do not take into account the %TBSA for each body part or they add up to a different value (27% + 18% + 18% = 63% for option B, 36% + 9% = 45% for option C, and 36% + 18% + 9% = 63% for option D).

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