Glasgow Coma Scale (GCS) Calculator
Standardised neurological assessment for trauma, stroke, intoxication, and any patient with altered consciousness. Eye + Verbal + Motor scores from 3 to 15.
Eye Opening (E)
Verbal Response (V)
Motor Response (M)
Total GCS Score
15/15
E4 V5 M6 — Mild Head Injury
Clinical Recommendation
Observation. Consider CT if risk factors (LOC, vomiting, seizure, anticoagulants, age >65).
Trauma assessment, captured by voice
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Also Known As
The Glasgow Coma Scale — Gold Standard for Consciousness Assessment
The Glasgow Coma Scale (GCS), developed in 1974 by Graham Teasdale and Bryan Jennett at the University of Glasgow, is the most widely-used clinical scale to assess level of consciousness. It evaluates three behavioral responses — Eye opening (1-4), Verbal response (1-5), and Motor response (1-6) — with a total ranging from 3 (deep coma) to 15 (fully alert).
The GCS is essential for emergency physicians, neurosurgeons, intensivists, anesthesiologists, and trauma teams across India — used in ATLS protocols, ICU monitoring, pre-anesthesia assessment, stroke evaluation, and head injury triage.
GCS Severity Classification
- Mild head injury (GCS 13-15): Concussion, observation, may be discharged after CT clearance
- Moderate head injury (GCS 9-12): Hospital admission, mandatory CT, neurosurgical consultation if intracranial pathology
- Severe head injury (GCS ≤8): Coma — secure airway (intubate), ICU admission, urgent CT, ICP monitoring may be required
Critical rule: GCS ≤8 = "Less than eight, intubate" — patients cannot protect their airway and require endotracheal intubation.
Common Pitfalls in GCS Scoring
- Always document component scores (E_V_M_), not just the total — same total can mean very different clinical pictures
- For intubated patients, score Verbal as "1T" (or "T") and document this clearly
- For periorbital edema preventing eye opening, score Eye as "1C" (Closed)
- Children <2 years: use the Pediatric GCS with age-appropriate verbal categories (cooing/babbling, irritable cry, etc.)
- Don't confuse decorticate (M3, flexion) with decerebrate (M2, extension) posturing
- Always trend GCS — a falling GCS is more concerning than a static low GCS
Frequently Asked Questions
▸What does GCS 15 mean?
GCS 15 is the maximum score, indicating a fully alert patient who opens eyes spontaneously, is oriented to person/place/time, and obeys commands.
▸Why intubate at GCS ≤8?
Patients with GCS ≤8 cannot reliably protect their airway from aspiration and cannot maintain adequate respiratory drive. Endotracheal intubation prevents aspiration pneumonia and respiratory arrest.
▸What is the difference between decorticate and decerebrate posturing?
Decorticate (M3) = flexion of arms with extension of legs (cortical lesion). Decerebrate (M2) = extension of all limbs (brainstem lesion, worse prognosis).
▸Can GCS be used in intoxicated patients?
GCS is unreliable when intoxication is present. Document the intoxication and serial GCS measurements. Reassess after sobering up to get true neurological baseline.
▸What is the difference between adult and pediatric GCS?
Pediatric GCS (used for children <2 years) replaces adult verbal categories with age-appropriate ones — cooing, irritable cry, persistent cry, moaning, no response.
▸Should I order a CT scan based on GCS alone?
GCS guides urgency, but CT decisions also use clinical criteria (Canadian CT Head Rule, NEXUS) — LOC, vomiting, seizure, anticoagulant use, suspected basilar skull fracture, etc.
References
- Teasdale G, Jennett B. Assessment of coma and impaired consciousness. Lancet 1974;2(7872):81-4
- Brain Trauma Foundation Guidelines for the Management of Severe Traumatic Brain Injury (4th Ed)
- NICE Guideline NG232: Head injury — assessment and early management
Standardise neuro assessments across your team
EasyClinic includes GCS, NIHSS, qSOFA, NEWS2, Wells Score, and Aldrete scores integrated into vitals — every nurse and doctor scores the same way, every time.