🧠 Glasgow Coma Scale
The complete breakdown of GCS scoring, clinical traps, pearls, and an interactive calculator — everything you need for the trauma bay and the exam hall.
The Glasgow Coma Scale
Developed at the University of Glasgow in 1974 by Teasdale and Jennett, the GCS is the universal language for describing level of consciousness. It gives clinicians a reproducible, objective number that allows serial comparison over time — an 11 that becomes an 8 is an emergency, regardless of who is doing the assessment. Its power lies in its simplicity and speed.
Spontaneous
Eyes are already open when you approach the patient. No stimulus needed. The patient may or may not be aware of their surroundings — eyes open does not mean conscious.
To Speech
Eyes open in response to a verbal command or your voice. This includes calling their name loudly or saying “open your eyes!” Does not need to be a shout — any verbal stimulus.
To Pain
Eyes open only when a peripheral painful stimulus is applied — supraorbital ridge pressure, nail-bed pressure, or trapezius pinch. Do NOT use sternal rub for eye opening (it is too close to the eyes and confounds the response).
None
No eye opening to any stimulus. If eyes are physically swollen shut from periorbital oedema (e.g., after facial trauma or “raccoon eyes” from a basal skull fracture) — document as E-NT (Not Testable), never as E1. A false “1” artificially lowers the GCS and may trigger inappropriate management decisions.
Oriented
The patient knows: Who they are (name), Where they are (in a hospital), and When it is (approximate date/year/month). All three must be correct for a full V5. A patient who knows their name but not where they are = V4.
Confused
Speaks in full, coherent sentences but gives incorrect or disoriented answers. For example: “I’m at my house” when they are in the emergency department, or “I don’t know where I am but I feel fine.” The sentences work grammatically — the content is wrong.
Inappropriate Words
Random words, expletives, shouting, or “word salad.” No conversational structure — just individual words thrown out with no meaningful context. No sentences. Often associated with agitation. Classic example: a patient who shouts “No! Water! Stop!” continuously in response to any stimulus.
Incomprehensible Sounds
Moans, grunts, groans. No recognisable words whatsoever. The patient is making noise — they are not completely silent — but it is purely vocalisation without linguistic content.
None
Absolute silence. If the patient is intubated, they physically cannot speak. Document as V-T (Verbal-Tube) or V-NT. Record the overall score as e.g. “E1 V-T M2”. Never score an intubated patient as V1 — the tube is causing the silence, not necessarily the brain injury. This becomes critical when prognosticating or discussing withdrawal of care.
The “Not Testable” Rule — One of the Most Important Rules in GCS
The GCS is a measure of neurological function — not mechanical obstruction. You must not penalise a patient for a physical barrier preventing them from responding:
👁️ Swollen eyes from orbital oedema or basal skull fracture → Document E-NT, not E1
🗣️ Intubated / tracheostomy patient → Document V-T, not V1
✋ Paralysed limb, cast, or peripheral nerve injury → Document which limb is untestable and score only testable limbs
Giving a false “1” has real consequences — an artificially low total GCS may trigger a mandatory intubation in an otherwise appropriate patient, or create a misleadingly grim prognosis for family discussions.