OSMT (Ontario Society of Medical Technologists) Practice Exam

What does the "Rule of Nines" indicate?

1. Percentage of body area affected

2. Amount of infection present

3. Amount of IV fluid necessary

4. Depth of the burn

The correct answer is: Percentage of body area affected

The "Rule of Nines" is a method used in medical settings to quickly assess the total body surface area (TBSA) affected by burns. This tool divides the body into sections that represent approximately 9% or multiples of 9% of the total body surface area. For instance, the head and neck account for 9%, each arm accounts for 9%, each leg accounts for 18%, the front and back of the torso each account for 18%, and the genital area accounts for 1%. This assessment is crucial for determining the severity of burns and guiding the appropriate treatment, including fluid resuscitation and transfer to specialized care if necessary. In contrast, the other options do not align with the function of the "Rule of Nines." While the amount of infection present, intravenous (IV) fluid requirements, and the depth of a burn are important aspects of burn management, they are evaluated through different methods and do not directly relate to the classification system represented by the "Rule of Nines." Thus, the correct answer accurately reflects the purpose of this assessment tool in determining the percentage of body area affected by burns.