What does GCS 15 mean?

A total of 15 means the best responses were observed in the three GCS components. It does not rule out concussion, neurologic symptoms or other clinical risk.

Does GCS 3 mean brain death?

No. GCS 3 is the lowest GCS total, but it is not a brain-death diagnosis. Causes such as sedation, intoxication, seizure or severe injury require clinical evaluation.

Should the total be written without components?

The component scores are important. A useful notation records eye, verbal and motor responses plus the total and any reason a component could not be tested.

Glasgow Coma Scale Calculator

Calculate the adult Glasgow Coma Scale total from eye opening, verbal response and motor response components, with cautions for non-testable components.

Eye opening

Verbal response

Motor response

Eye opening cannot be assessed because of swelling, dressing, or facial injuryPatient is intubated or has a tracheostomy

What this GCS calculator records

The Glasgow Coma Scale records the best observed eye opening, verbal response and motor response. The total ranges from 3 to 15, but the component scores and the reason for any non-testable component should be documented with the total.

GCS = E + V + M

Eye opening plus verbal response plus motor response.

Not a stand-alone diagnosis or prognosis

GCS does not by itself diagnose brain death, predict an individual outcome or decide airway, imaging or neurosurgical treatment. Altered consciousness or head injury needs urgent clinical assessment.

Adult GCS components

Component	Range	Best response
Eye opening	1 to 4	Spontaneous eye opening scores 4.
Verbal response	1 to 5	Oriented conversation scores 5.
Motor response	1 to 6	Obeys commands scores 6.
Total	3 to 15	Report the total with component scores.

Intubation, tracheostomy, facial swelling, eye injury, sedation, intoxication, seizures and paralytic medicines can make one or more components hard to assess. Document those limitations rather than pretending the component was observed normally.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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