What percentage of body surface area does each arm represent for an adult or adolescent?

Each arm represents 9% of the total body surface area for an adult or adolescent. This percentage is part of the "Rule of Nines," which is a method used in pre-hospital care to quickly assess the extent of burns or other injuries and assist in determining treatment decisions. In this rule, the body is divided into sections, each accounting for a specific percentage of total body surface area.

For adults and adolescents, the total body surface area is divided as follows: the head and neck are considered 9%, each arm accounts for 9%, the anterior and posterior torso each account for 18%, each leg accounts for 18%, and the perineum accounts for 1%. Thus, recognizing that each arm constitutes 9% is critical for effective patient assessment and management in emergency situations.