Updated July 2026 · 10 min read
Part of the ICU Emergencies Hub — browse every related guide in one place.
The neuro check is the ICU's early-warning radar for the brain. A rising ICP, an expanding bleed, a new stroke — they rarely announce themselves with an alarm. They show up as a subtle drop in the exam that the nurse doing serial checks is positioned to catch before the CT does. The value isn't any single score; it's the trend across your checks.
Score each category by the patient's best response, using the minimum stimulus needed. Start with voice; escalate to a peripheral then central painful stimulus only if there's no response.
| Eye opening (E) | Verbal (V) | Motor (M) — best response |
|---|---|---|
| 4 – Spontaneous | 5 – Oriented | 6 – Obeys commands |
| 3 – To voice | 4 – Confused | 5 – Localizes to pain |
| 2 – To pain | 3 – Inappropriate words | 4 – Withdraws from pain |
| 1 – None | 2 – Incomprehensible sounds | 3 – Abnormal flexion (decorticate) |
| 1 – None | 2 – Abnormal extension (decerebrate) | |
| 1 – None |
Report it as its parts: "GCS 10, E3 V3 M4." An intubated patient can't be scored verbally — document the verbal component as "T" (e.g., E3 VT M5), never a guessed number.
Abnormal posturing localizes injury and trends badly:
| Posture | What it looks like | Significance |
|---|---|---|
| Decorticate (M3, flexion) | Arms flexed, drawn in toward the core; legs extended | Lesion above the brainstem — serious |
| Decerebrate (M2, extension) | Arms extended and internally rotated, rigid | Deeper brainstem involvement — more ominous |
A patient who moves from decorticate to decerebrate is deteriorating — the injury is progressing downward through the brainstem. That is an urgent finding.
The GCS is the headline, but a complete serial neuro assessment covers more:
A new fixed and dilated pupil — the "blown pupil" — is a neurologic emergency, classically from uncal herniation compressing the third cranial nerve on that side. New asymmetry (anisocoria), a sluggish reaction where there was a brisk one, or bilateral fixed pupils all demand immediate escalation. Document actual measurements in millimeters, not just "equal," so the next nurse can see a trend.
Serial checks only help if you act on the delta. Escalate promptly for:
| Change | Why it matters |
|---|---|
| GCS drop of 2 or more points | Meaningful decline; commonly the threshold to notify and re-image |
| New pupil asymmetry or a newly fixed pupil | Possible herniation / third-nerve compression |
| New focal weakness or asymmetry | Possible new stroke or expanding lesion |
| New or worsening posturing | Progressing brainstem involvement |
| Cushing's pattern on vitals | Rising ICP, late sign |
The point of a serial exam is comparison, so remove the variables you can. Use the same stimulus, the same order, and document specifically enough that the oncoming nurse can reproduce your exam. "Confused, not following commands consistently" the next shift can act on; "neuro intact" they cannot. And account for confounders — sedation, paralytics, and metabolic derangements all blunt the exam, so interpret the score in that context rather than in isolation.
Score the GCS by best response, report the three components, and weight the motor score. Then look past the number: pupils, focal strength, posturing, and the Cushing pattern round out the picture. The single most useful thing a nurse does here is notice the change early — a 2-point drop, a new asymmetric pupil, a new drift — and escalate before the deterioration becomes a code. The brain rarely gets suddenly worse without first getting a little worse first.
This article is general educational information for licensed clinicians and students, not medical advice or a substitute for your institution's protocols or a provider's orders. Always follow facility policy.
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