Glasgow Coma Scale
GCS Calculator
Enter the patient's visual, verbal, and motor responses to instantly calculate the Glasgow Coma Scale (GCS). Evaluate the level of consciousness following a brain injury or medical illness.
Calculate GCS Score
Assess Eye, Verbal, and Motor responses
Observe how the patient opens their eyes.
Assess the patient's speech and awareness.
Observe how the patient physically moves.
Glasgow Coma Scale Score
What Is the Glasgow Coma Scale?
The Glasgow Coma Scale (GCS) is an objective, clinical tool designed to assess the level of consciousness in humans. It is universally used in emergency medicine to gauge the severity of an acute brain injury.
The scale evaluates three independent factors: Eye Opening (E), Verbal Response (V), and Motor Response (M). The scores from each category are summed to provide a final GCS score ranging from 3 (deep coma) to 15 (fully awake and alert).
How to Interpret the GCS Score
| GCS Score | Classification | Clinical Interpretation | Action Required |
|---|---|---|---|
| 13 – 15 | Mild Brain Injury | Patient is mostly alert and responsive. | Routine observation; check for concussions. |
| 9 – 12 | Moderate Brain Injury | Lethargic, confused, or requiring strong stimuli to respond. | Close monitoring; medical intervention likely needed. |
| 3 – 8 | Severe Brain Injury | Comatose, unconscious, minimal or no response. | Immediate emergency care; airway protection (intubation) usually required. |
Eye Opening (Max 4)
Assesses arousal mechanisms of the brainstem. Opening eyes spontaneously scores a 4. If they only open to pain or pressure, the score decreases. No opening at all results in a 1.
Verbal Response (Max 5)
Evaluates the integration of cerebral cortex function. Asking basic questions (Who are you? Where are we?) helps determine if they are fully oriented (5) or confused (4).
Motor Response (Max 6)
Checks central nervous system integrity. Obeys commands scores a 6. Abnormal flexion (decorticate) or extension (decerebrate) indicates severe brain damage.
"GCS of 8, Intubate"
A widely taught medical rule. If a patient's GCS score falls to 8 or below, they are in a coma and typically cannot protect their own airway, necessitating immediate intubation.
How to Correctly Assess the Glasgow Coma Scale
- 1Observe First — Do not touch or speak to the patient initially. Observe if their eyes open spontaneously and if they move naturally.
- 2Use Verbal Stimuli — Speak in a normal tone, then a loud voice. Ask simple, structured questions to test orientation.
- 3Apply Physical Stimuli Only if Necessary — If they do not respond to voice, apply increasing pressure (e.g., fingertip pressure or trapezius pinch) to test motor and eye response to pain.
- 4Record the Breakdown, Not Just Total — A GCS of 9 can be E2 V4 M3 or E3 V1 M5. Documenting the specific E-V-M breakdown provides much better clinical context for doctors.
- 5Note Untestable Factors — If a patient has severe eye swelling preventing opening, or is intubated and cannot speak, mark them as 'NT' (Not Testable) rather than a 1, to prevent artificially lowering the score.
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