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Page 1. The Glasgow Coma Scales. The Glasgow Coma Scale (GCS) is the most widely used. scoring system used in quantifying the level of consciousness. following traumatic brain injury. It is used because it is simple, has a relatively high degree of reliability and correlates well with. outcomes following severe brain injury.
Research shows that a comatose patient's outcome relates very closely to his or her Glasgow Coma Scale score. The majority of people (87 percent) who score a three or a four on the scale within the first 24 hours of going into a coma are likely to either die or remain in a vegetative state. On the other end of the scale, about 87 percent of those who score between 11 and 15 are likely to make a good recovery [ref].