What are the levels used to determine brain injury stages?

Brain injury stages are typically assessed using a variety of scales, with the Glasgow Coma Scale (GCS) being one of the most common. The GCS evaluates a patient's level of consciousness based on eye, verbal, and motor responses, assigning scores that range from 3 to 15. Other methods include the Rancho Los Amigos Scale, which categorizes recovery stages from non-responsive to purposeful behavior. These levels help clinicians determine the severity of the injury and guide treatment and rehabilitation strategies.