The Glasgow Coma Scale (GCS) evaluates consciousness levels in patients with traumatic brain injury, comprising three categories: eye opening, motor response, and verbal response, with a scoring range of 3 to 15. A clinical case is presented involving a 64-year-old woman with hypertension who experienced a stroke, leading to brain stem death and subsequent discontinuation of life support. The document includes detailed scoring criteria for GCS and describes the patient's symptoms, examination findings, and test results.