The Glasgow Coma Scale (GCS) is a tool used to assess a person's level of consciousness. It evaluates three responses: eye opening, verbal, and motor. Each response is scored based on predefined criteria, and the total GCS score ranges from 3 to 15: 

Eye Opening Response:
- Spontaneously: 4 points
- To verbal command: 3 points
- To pain: 2 points
- No response: 1 point

Verbal Response:
- Oriented: 5 points
- Confused: 4 points
- Inappropriate words: 3 points
- Incomprehensible sounds: 2 points
- No verbal response: 1 point

Motor Response:
- Obeys commands: 6 points
- Purposeful movement to painful stimulus: 5 points
- Withdraws in response to pain: 4 points
- Flexion in response to pain: 3 points
- Extension response in response to pain: 2 points
- No motor response: 1 point

To determine the GCS score, collect the patient's responses across these three categories. Assign the corresponding numerical score for each response, then sum them to get the total score. The total score indicates the level of consciousness:

- A score of 3 suggests deep unconsciousness or severe impairment.
- Scores from 4 to 15 indicate ascending levels of consciousness, with lower scores signifying more serious unconscious states.
- Scores between 13 and 15 indicate full consciousness or only mild impairment.

By organizing the patient responses, converting them to numerical values, summing the totals, and analyzing the score range, one can interpret the patient's state of consciousness based on the GCS.

The Glasgow Coma Scale (GCS) is a clinical calculator used to assess the level of consciousness in patients, particularly those with traumatic brain injury. It is applicable to a wide range of patient populations, including both adults and children, and is used in various clinical settings such as emergency departments, intensive care units, and general wards. 

The GCS evaluates three aspects of a patient's responsiveness: eye opening, verbal response, and motor response. Each aspect is scored separately, and the scores are then summed to give a total GCS score ranging from 3 (indicating deep unconsciousness) to 15 (indicating full consciousness). 

The GCS is a valuable tool for initial and ongoing assessment of a patient's neurological status, and it helps guide treatment decisions and prognostication. It is also widely used in clinical research and for benchmarking the quality of care for patients with brain injury.

There are no specific exclusion criteria for the use of the GCS. However, it may be less accurate or not applicable in patients with certain conditions that can affect consciousness or the ability to respond, such as intoxication, hypothermia, or severe facial trauma. It is also less useful in intubated patients, as their verbal response cannot be assessed.