This document discusses the Glasgow Coma Scale (GCS), a tool used to assess a person's level of consciousness after head trauma or during certain medical conditions. The GCS evaluates eye opening, verbal response, and motor response on a scale of 3-15, with lower scores indicating more severe brain injury. Scores are interpreted as severe (GCS ≤ 8), moderate (GCS 9-12), or minor (GCS ≥ 13). The GCS provides important baseline information to monitor patients with conditions that can affect consciousness like hypoxia, hypoglycemia, head trauma, neurological diseases, or after anesthesia.