Looking for more details? Read our comprehensive GCS guide
What is the Glasgow Coma Scale?
The Glasgow Coma Scale (GCS) is a neurological scale which aims to give a reliable and objective way of recording the state of a person's consciousness for initial as well as subsequent assessment.
Clinical Application
The GCS is used to help assess the severity of brain injury. It is a key tool in clinical practice, particularly in intensive care and trauma settings. The scale assesses three components of responsiveness: Eye, Verbal, and Motor.
Scoring Ranges
- 13-15: Mild brain injury
- 9-12: Moderate brain injury
- 3-8: Severe brain injury (Comatose)
Case Scenario
Patient: A 30-year-old female is brought into the ED after a motor vehicle collision. Her eyes open to pain (2), she is using inappropriate words (3), and withdraws her arm from a painful stimulus (4).
Calculation: GCS = E2 + V3 + M4 = 9
Interpretation: GCS 9 (Moderate head injury).
Next Steps: Monitor airway closely, obtain urgent CT head, and consult neurosurgery.
Frequently Asked Questions
An intubated patient cannot speak, so the verbal component is scored as 1T (or sometimes NT for Not Testable). The total score is written as, for example, 10T.
No. GCS can be depressed by intoxication (alcohol, drugs), metabolic disturbances (hypoglycemia, hypoxia), or post-ictal states following a seizure.
How to Use
Select the best response in three categories: Eye Opening, Verbal Response, and Motor Response. The tool sums the scores to provide a total Glasgow Coma Scale score.