The Glasgow Coma Scale (GCS) is a clinical scale used to measure a persons level of consciousness after a brain injury. It is a reliable and objective way of recording the initial and subsequent level of consciousness in a person after a brain injury. The GCS assesses a person based on their ability to perform eye movements, speak, and move their body. These three behaviors make up the three elements of the scale: eye, verbal, and motor. A persons GCS score can range from 3 (completely unresponsive) to 15 (responsive) . The GCS is used to guide immediate medical care after a brain injury, such as a car accident, and also to monitor hospitalized patients and track their level of consciousness. The scale assesses patients according to three aspects of responsiveness: eye-opening, motor, and verbal responses. The GCS is a key tool for measuring comas and decreases in consciousness. It is the most commonly used scale for measuring decreases in consciousness, including coma. The GCS is usually not used with children, especially those too young to have reliable language skills. The Pediatric Glasgow Coma Scale, or PGCS, a modification of the scale used on adults, is used instead.