NOI refers to

• A. Mechanism of Injury
• B. Nature of Illness
• C. Scene Safety
• D. Spinal Motion Restriction

Answer: (B)

Nature of Illness refers to the medical conditions and illnesses a patient has, rather than injuries. In EMS and trauma assessment, you separate what happened to the patient from what the patient is experiencing medically. The mechanism of injury describes how an injury occurred (for example, a fall or a car crash), which is important in trauma scenarios. Scene safety is about making sure the environment is safe for responders before giving care. Spinal motion restriction is a protocol aimed at limiting movement of the spine when a spinal injury is suspected. Therefore, Nature of Illness is used to categorize presentations that are medical in nature—like chest pain, breathing difficulties, stroke symptoms, or diabetic emergencies—where the focus is on medical management rather than immobilization or assessing traumatic mechanism.