How to Calculate Glasgow Coma
What is Glasgow Coma?
The Glasgow Coma Scale quantifies consciousness level from 3 (minimum) to 15 (maximum). It's used in emergency medicine to assess neurological status and predict outcomes.
Formula
Total GCS = E + V + M; results interpret consciousness level
- GCS
- E + V + M; results interpret consciousness level — E + V + M; results interpret consciousness level
- E
- E value — Variable used in the calculation
- V
- V value — Variable used in the calculation
- M
- M value — Variable used in the calculation
Step-by-Step Guide
- 1Score eye opening (E), verbal response (V), and motor response (M)
- 2Enter values from patient observation: E (1-4), V (1-5), M (1-6)
- 3Total GCS = E + V + M; results interpret consciousness level
Worked Examples
Input
E=3 (closed), V=1 (none), M=3 (abnormal flexion)
Result
GCS = 7 (severe impairment)
Indicates critical condition
Common Mistakes to Avoid
- ✕Misinterpreting pain response levels in motor component
- ✕Not accounting for intubation when recording verbal score
Frequently Asked Questions
What does each component measure?
Eye opening shows arousal; verbal response shows orientation; motor response shows ability to obey commands.
How does GCS predict outcome?
Lower GCS scores correlate with worse outcomes; GCS 3-5 has mortality ~80%, GCS 13-15 has mortality ~5%.
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