GCS scale - #6812

I recently heard about the GCS scale, and I wasn’t sure exactly how it’s used in medicine. What is the GCS scale, and how do doctors use it to assess patients? From what I read, the GCS scale (Glasgow Coma Scale) is used to measure a person’s level of consciousness after a brain injury. But how do doctors determine a patient’s score—does it always involve testing eye, verbal, and motor responses? I also learned that a GCS scale score ranges from 3 to 15, with lower scores indicating more severe brain injury. But is the GCS scale always accurate, or can other factors like medications, shock, or intoxication affect the results? Another thing I wonder is whether the GCS scale is used for all types of brain injuries, including strokes, traumatic brain injuries, and seizures. For those who have seen the GCS scale used in a medical setting, how was it applied, and how accurate was it in predicting recovery?