Using the rule of nines in an adult, what percentage of body surface area is the whole of one leg (front and back)?

Answer and explanation

Correct answer: C. 18%

  1. Step 1: In adults, the head is 9%, each arm 9%, the front of the trunk 18%, the back of the trunk 18%, each leg 18% and the perineum 1%.
  2. Step 2: Adding the relevant regions gives 18%.
Answer
18%.
Why not the others: '27%' adds an extra region of 9%; '9%' omits one region of 9%; '45%' doubles the correct figure.

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