Assessing the state of consciousness of a patient who has suffered traumatic brain injury is often done by emergency medical responders and physicians shortly after an accident. The Glasgow Coma Scale (GCS) assists a medical team to have an objective assessment of the extent of consciousness of the victim. The scale helps the team to conclude the degree to which the patient is conscious or comatose.
The Glasgow Coma Scale (GCS) is also known by another name – Glasgow Coma Score. The scale uses a rating method ranging from 3 to 15, where the higher level of consciousness is denoted by a higher score. An example can explain this better. A healthy conscious adult would have a score of 15 but a completely unconscious individual would get a score of 3.
To assess the medical condition of a patient who has suffered a traumatic brain injury in the immediate past, the Glasgow Coma Scale (GCS) provides invaluable help to doctors and emergency room staff. Of course the scale is also frequently used by other streams of the medical fraternity including doctors attached to intensive care units, EMTs and healthcare providers responsible for chronic care.
Glascow Coma Scale – how did it begin?
It took two professors of neurosurgery, Graham Teasdale and Bryan J. Jennett, teaching at the University of Glasgow to come up with the Glasgow Coma Scale (GCS) in 1974. With years of experience in the field of management of head trauma and brain injuries, the duo even published a book called Management of Head Injuries in 1981.
Teasdale and Jennett’s untiring work on the subject has helped millions of doctors round the world to successfully diagnose and treat comatose patients who have been victims of head trauma and brain injuries. Their work has also provided inspiration and motivation to other researchers and doctors to design similar diagnostic tools, especially the Rancho Los Amigos Scale. This scale is one of the most efficient tools to assess traumatic brain injuries or TBI.
Glascow Coma Scasle – how it does what it does
The state of consciousness of a brain-injured patient is assessed by the GCS using a 15-point rating method as mentioned earlier. The scale works by allotting points to the several physical responses received from the victim. These include evaluating his sense of vision, verbal responses and other motor skills. The table below shows how the point allotment is done by the GCS.
Physical Response
Physical Response
l/ |
Points Assigned
-> |
1 |
2 |
3 |
4 |
5 |
6 |
| Visual Response |
Eyes remained closed. |
Pain causes eyes to open. |
Voices cause eyes to open. |
Eyes open randomly. |
N/A |
N/A |
| Verbal Ability |
Silence. |
Minimal, indistinguishable sounds. |
Mumbles obscenities. |
Incoherent rambling. |
Normal conversation. |
N/A |
| Motor Skills |
Immobile. |
Pain causes extension movements. |
Pain causes flexion movements. |
Pain causes movement away from stimuli. |
Complicated movement in response to pain. |
Moves on command. |
To clear any ambiguity in the assessment of level of consciousness between children and adults, since both can suffer from the same condition of loss of consciousness, the GCS has included a special feature for examining the verbal ability of the patient. The verbal ability of the respondent is then adjusted in the point rating according to categories as mentioned below:
- 1 point: Zero response or silent
- 2 points: Groans or snorts
- 3 points: Continuous crying. Babies would cry even with positive stimuli
- 4 points: Incoherent murmuring. Babies cry at the right time and responds well when comforted.
- 5 points: No speech impairment. Infants smile and blabber.
Though allocating points to the different consciousness levels and relating it to the correct condition may seem easy, the job of categorizing the patients may not be as simple. For example, when the eyes are inflamed after a traumatic head injury, doctors find it difficult to assess the visual responses of the patient.
Therefore doctors might have to use the GCS several times on a patient with head trauma and brain injuries to decipher the precise condition of the individual and also to identify the emerging needs.