The Glasgow Coma Scale (GCS) is a neurologicalscale which aims to give a reliable and objective way of recording the conscious state of a person for initial as well as subsequent assessment. A person is assessed against the criteria of the scale, and the resulting points give a person's score between 3 (indicating deep unconsciousness) and either 14 (original scale) or 15 (more widely used modified or revised scale).
GCS was updated following a review of the helpfulness and usefulness of the scale from Clinicians. It was decided that several things required updating, like the Eye Response element, meaning that instead of responding to "Painful Stimuli" being regarded as a 2, a person that opens their eyes in response to pressure is now considered a 2 in the Eye Response element.
Note that a motor response in any limb is acceptable.
The scale is composed of three tests: eye, verbal and motor responses. The three values separately as well as their sum are considered. The lowest possible GCS (the sum) is 3 (deep coma or death), while the highest is 15 (fully awake person).
Eye response (E)
There are four grades starting with the most severe: