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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.
The score is determined by the sum of the score in each of the 3 categories, with a maximum score of 15 and a minimum score of 3, as follows: GCS score = E + M + V. Also see Medscapeâs Glasgow Coma Scale Calculator.