Which GCS score indicates the most severe brain injury?

The Glasgow Coma Scale (GCS) is a tool used to assess a person's level of consciousness after a brain injury. It evaluates three aspects: eye opening, verbal response, and motor response, with scores ranging from 3 to 15. A score of 3 indicates the lowest level of consciousness, signifying a complete lack of responsiveness. This suggests severe brain injury, as the individual is unable to open their eyes, respond verbally, or move in response to stimuli.

In contrast, higher scores, such as 12 or 15, indicate a better level of consciousness, reflecting varying degrees of response and awareness. Therefore, a score of 3 distinctly represents the most severe impairment in brain function, highlighting critical neurological damage requiring immediate attention.