Emergency Medical Technician (EMT) Trauma Practice Test

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A 30-year-old man sustained partial-thickness burns to the anterior chest and both anterior arms. Based on the Rule of Nines, what percentage of his body surface area has been burned?

  1. 18%

  2. 27%

  3. 36%

  4. 9%

The correct answer is: 18%

The Rule of Nines is a quick and easy way to estimate the percentage of total body surface area that has been burned in adult patients. According to the Rule of Nines, the anterior chest and both anterior arms each account for 9% of the total body surface area. Therefore, if a 30-year-old man sustains partial-thickness burns to the anterior chest and both anterior arms, the calculated percentage of body surface area burned would be 9% (chest) + 9% (right arm) + 9% (left arm) = 27%.

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