In the Rule of Nines, the perineal/genital area accounts for approximately:

• A. 9%
• B. 0%
• C. 1%
• D. 4%

Answer: (C)

In the Rule of Nines, burn size is estimated by assigning fixed percentages to major body regions so you can quickly total TBSA. The perineal/genital region is a small area, so it contributes about 1% to the total body surface area. When you add up the rest of the regions—head and neck 9%, each arm 9% (18% total for both), anterior trunk 18%, posterior trunk 18%, and each leg 18% (36% total for both)—you reach 99%. The perineum accounts for the remaining 1% to bring the total to 100%. This small area matters for calculations used in resuscitation, like the Parkland formula, where accurate TBSA helps guide fluid needs. It isn’t zero, nor is it large like 4% or 9%; it’s simply a small portion that completes the full 100%.