🧠 Glasgow Coma Scale (GCS) Calculator

Sum eye-opening (E), verbal (V), and motor (M) response scores to determine the level of consciousness (3-15) and severity category. This reproduces the standard scale used by clinicians for education purposes.

⚠️ Medical Disclaimer

This tool is for educational and reference purposes only and cannot replace medical diagnosis or treatment decisions. If someone has a decreased level of consciousness, head injury, or emergency neurological symptoms, seek emergency care or call your local emergency number immediately regardless of this calculator's result.

Eye Opening (E)

Verbal Response (V)

Motor Response (M)

Total Score (3-15)

Notation E4V5M6

Severity

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⚠️ Medical Disclaimer

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GUIDE

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What Is the Glasgow Coma Scale?

The GCS was developed in 1974 by Graham Teasdale and Bryan Jennett at the University of Glasgow to objectively assess level of consciousness. It scores three domains - eye opening, verbal response, and motor response - and sums them into a total from 3 to 15.

How GCS Is Scored

Total = Eye Opening (E, 1-4) + Verbal Response (V, 1-5) + Motor Response (M, 1-6)

Example: E4V5M6 = 15 (fully alert). Since the minimum response in each domain is 1, the theoretical minimum total is 3.

Severity Classification

Score	Severity	Description
13-15	Mild	Concussion-level, alert or mildly confused
9-12	Moderate	Drowsy/confused, requires ongoing observation
≤8	Severe	Possible coma; consider emergency airway management

GCS Notation (E#V#M#)

Clinicians record the individual component scores alongside the total, e.g. "GCS 11 = E3V4M4." This shows which domain is impaired - information the total alone cannot convey.

Clinical Uses of GCS

GCS is used to assess and track decreased consciousness from head trauma, stroke, intoxication, or metabolic disturbances over time. It informs emergency department triage, neurosurgical decision-making, and prognosis as one supporting indicator.

Limitations of GCS

Interpretation needs care in intubated patients (verbal response cannot be assessed, noted as "VT"), facial swelling preventing eye opening, drug/alcohol intoxication, and children. Children should be assessed with the separate Pediatric GCS.

When to Seek Emergency Help

Regardless of the GCS score, seek emergency help immediately if you observe:
• Sudden worsening of consciousness
• Irregular or shallow breathing
• Unequal or non-reactive pupils
• Seizures
• Persistent vomiting or headache after significant head trauma

Frequently asked questions

Does a low GCS score always mean an emergency?

A score of 8 or below is generally classified as severe and often requires emergency care, but this depends on cause and clinical course. This calculator is for reference only - actual emergency assessment must be made by medical professionals.

How is verbal response assessed for intubated patients?

When verbal response cannot be assessed (e.g., intubation), clinicians typically note "VT" instead of a numeric V score and record it separately from the total. This calculator is a simplified educational version - follow the assessment of the treating clinician in real situations.

Can this calculator diagnose brain injury?

No. GCS only quantifies level of consciousness; it is not a diagnosis by itself. Imaging (CT, MRI) and a full neurological exam by medical professionals are always required.