GCS 3 – what does it mean?

⚠︎ Learning page – classification and study figures only, no treatment recommendation.

In short

GCS 3 is the lowest possible Glasgow Coma Scale score. It can only come about one way: E1V1M1 – no eye opening, no verbal and no motor response.

The figures describe groups in the cited studies, not the risk of an individual person. This page contains no treatment or management recommendation.

Classification

In traumatic brain injury, GCS 3 belongs to the 3–8 (severe) group according to the MSD Manual; totals of 8 or less are typically regarded as coma there.

"3T" and "not testable"

Notations such as "3T" mark an intubated person whose verbal response cannot be assessed. According to the structured approach (glasgowcomascale.org), a component that cannot be tested is recorded as NT rather than scored as 1, and no total is given.

Components rather than total

According to Teasdale et al. (2014), individual patients are best described by the three components (for example E3V4M6); the total is better suited to characterising groups. If a component cannot be assessed, for example the verbal response during intubation, it is recorded as NT (not testable) and no total is given (glasgowcomascale.org).

All ranges at a glance

GCSSeverity of traumatic brain injury (convention, MSD Manual)
13–15mild
9–12moderate
3–8severe

Single scores: GCS 15 · GCS 3

Calculate it yourself

Enter the criteria in the Glasgow Coma Scale (GCS) calculator – it runs only in your browser.

FAQ

What does GCS 3 mean?▾

The lowest possible score: E1V1M1, i.e. no response in any of the three components.

Why is the lowest score 3 and not 0?▾

Each of the three components starts at 1 point ("none"). The total therefore ranges from 3 to 15.

References

  1. Teasdale G, Jennett B. Assessment of coma and impaired consciousness. A practical scale. Lancet 1974;2:81–4. · PubMed
  2. Teasdale G et al. The Glasgow Coma Scale at 40 years: standing the test of time. Lancet Neurol 2014;13:844–54. · PubMed
  3. Glasgow Coma Scale – Structured Assessment, FAQ und Permissions. © University of Glasgow (GCS); Royal College of Physicians and Surgeons of Glasgow. · glasgowcomascale.org
  4. MSD Manual Professional Edition: Traumatic Brain Injury (TBI) (Stand 02/2025) – Abschnitt Glasgow Coma Scale. · msdmanuals.com

Learning page for medical education only: classification and figures reported in the cited sources, no treatment or management recommendation, not for use in patients; not a medical device. Last updated: 10/2026 · Dr. Pascal Bafteh