In the Rule of Nines, which region accounts for 1% TBSA?

In the Rule of Nines, which region accounts for 1% TBSA?

• A. Head
• B. Arm
• C. Perineum
• D. Legs

Answer: (C)

In the Rule of Nines, burn size is estimated by assigning approximate percentages to body regions so you can quickly gauge how much surface area is involved. The perineum is set at 1% TBSA because that area is small relative to the rest of the body. In adults, the breakdown is head and neck 9%, each arm 9%, each leg 18%, anterior trunk 18%, posterior trunk 18%, and the perineum 1%. So the region that accounts for 1% TBSA is the perineum. The other regions listed are larger: the head is 9%, an arm is 9%, and legs are 18% each.

In the Rule of Nines, burn size is estimated by assigning approximate percentages to body regions so you can quickly gauge how much surface area is involved. The perineum is set at 1% TBSA because that area is small relative to the rest of the body. In adults, the breakdown is head and neck 9%, each arm 9%, each leg 18%, anterior trunk 18%, posterior trunk 18%, and the perineum 1%. So the region that accounts for 1% TBSA is the perineum. The other regions listed are larger: the head is 9%, an arm is 9%, and legs are 18% each.