Neurological Assessment Nursing Guide 2026

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GCS, cranial nerves, pupil assessment, ICP signs, stroke recognition, and everything else you need for a complete neuro assessment — from NCLEX to the ICU.

1. Level of Consciousness (LOC)

LOC is the most sensitive indicator of neurological change. Assess from highest to lowest:

Alert: Awake, oriented, responds appropriately
Confused: Oriented to person and place; disoriented to time; follows commands
Lethargic: Drowsy; opens eyes with voice; follows commands when aroused
Obtunded: Dull; opens eyes to painful stimuli; minimal verbal response
Stupor: Deep sleep; responds only to vigorous or painful stimuli; not arousable to verbal
Coma: No purposeful response to stimuli

2. Glasgow Coma Scale (GCS)

Objective tool to quantify LOC. Scores 3 (worst) to 15 (normal). GCS ≤8 = comatose = unable to protect airway → intubation typically indicated.

Component	Response	Score
Eyes (E)	Spontaneous	4
	To voice/command	3
	To pain	2
	None	1
Verbal (V)	Oriented	5
	Confused	4
	Inappropriate words	3
	Incomprehensible sounds	2
	None	1
Motor (M)	Obeys commands	6
	Localizes pain	5
	Withdraws from pain	4
	Flexion (Decorticate — arms flex to chest)	3
	Extension (Decerebrate — arms extend outward)	2
	None	1

GCS Motor mnemonic "6 = Go, 5 = Localize, 4 = With, 3 = Flex, 2 = Extend, 1 = None" — Decorticate (3) = arms flex = cortical injury; Decerebrate (2) = arms extend = brainstem injury. Decerebrate is worse.

3. Pupil Assessment

Normal Pupils

PERLA — Pupils Equal, Round, Reactive to Light and Accommodation. Document: size in mm, equality (equal vs unequal), reactivity (brisk/sluggish/fixed), and shape (round vs irregular).

Abnormal Pupil Findings

Pupil Pattern	Size/Reaction	Clinical Meaning
Unilateral fixed dilated ("blown pupil")	One pupil 6–8 mm, non-reactive	HERNIATION — CN III compression by uncal herniation (transtentorial). EMERGENCY — ICP crisis.
Bilateral fixed dilated	Both 6–8 mm, non-reactive	Severe anoxic brain injury, brainstem death, atropine overdose, massive catecholamine surge
Bilateral fixed small (pinpoint)	1–2 mm, non-reactive	Opioid overdose, pontine hemorrhage
Bilateral small, reactive	2–3 mm, reactive	Normal in sleep, opioids (mild), benzodiazepines
Horner's syndrome	Unilateral: small pupil (miosis) + ptosis + anhidrosis (no sweating)	Ipsilateral sympathetic chain disruption: carotid dissection, superior sulcus tumor, neck trauma
Hippus	Rhythmic pupillary oscillation	May be normal variant; can be seen in early herniation

Blown pupil = herniation until proven otherwise. Unilateral fixed dilated pupil in a declining neurologic patient = CN III compression = uncal herniation = EMERGENCY. Notify provider immediately and prepare for ICP management (HOB 30°, hyperventilate, mannitol/hypertonic saline).

4. Cranial Nerve Assessment

CN	Name	Function	Bedside Test
I	Olfactory	Smell	Identify familiar odors (coffee, vanilla) — each nostril separately
II	Optic	Vision	Visual acuity, visual fields (confrontation testing), fundoscopy (papilledema = ICP)
III	Oculomotor	Eye movement (up/down/in), pupil constriction, eyelid elevation	Pupil reactivity + "follow my finger" in H-pattern; ptosis assessment
IV	Trochlear	Eye movement (downward + inward)	Ask patient to look down and in; diplopia on downgaze = CN IV palsy
V	Trigeminal	Facial sensation + chewing muscles	Light touch and pin-prick in forehead/cheek/chin (3 branches); corneal reflex; jaw clench
VI	Abducens	Lateral eye movement (abduction)	Ask patient to look far to each side; inability to abduct = CN VI palsy (false localizing sign with ICP)
VII	Facial	Facial expression, taste (anterior 2/3 tongue), lacrimation	Smile/raise eyebrows/close eyes tight; asymmetric smile. Upper vs lower facial weakness distinguishes central (stroke) vs peripheral (Bell's palsy)
VIII	Vestibulocochlear	Hearing and balance	Whisper test each ear; Weber/Rinne tests; oculocephalic reflex (doll's eyes) in comatose
IX	Glossopharyngeal	Taste posterior 1/3 tongue, gag, swallowing, carotid sinus reflex	Gag reflex; assess symmetrical palate rise with "ahh"
X	Vagus	Swallowing, phonation, autonomic (HR, GI)	Swallow assessment; voice quality (hoarse = vagal issue); uvula deviation (pulls away from lesion)
XI	Accessory	Sternocleidomastoid + trapezius movement	Shrug shoulders against resistance; turn head against resistance
XII	Hypoglossal	Tongue movement	Stick out tongue — deviates TOWARD side of lesion in lower motor neuron; atrophy and fasciculations in LMN

Mnemonic for CN names: "Oh Oh Oh To Touch And Feel Very Good Velvet And Heaven" = Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Vestibulocochlear, Glossopharyngeal, Vagus, Accessory, Hypoglossal

5. Increased Intracranial Pressure (ICP)

Normal ICP and Cerebral Perfusion Pressure (CPP)

Normal ICP: 5–15 mmHg (7–20 in some sources)
Sustained ICP >20 mmHg = abnormal; >40 mmHg = severe
CPP = MAP − ICP (goal CPP 60–70 mmHg in TBI)
Monroe-Kellie doctrine: Brain + blood + CSF = constant volume in rigid skull. Increase one → compress another → ICP rises

Signs of Increased ICP (Early vs Late)

Early Signs (subtle — catch these)	Late Signs (ominous)
Restlessness, irritability, subtle personality change	Cushing's Triad (see below)
Headache (worse in morning, worse with Valsalva)	Blown (unilateral fixed dilated) pupil — herniation
Vomiting (often projectile, without nausea)	Decorticate or decerebrate posturing
Papilledema (on fundoscopy)	Falling GCS, coma
Subtle LOC changes — decreased alertness	Respiratory pattern changes (Cheyne-Stokes, central neurogenic hyperventilation, ataxic)
Blurred vision, diplopia (CN VI is first to be stretched)	Loss of brainstem reflexes

Cushing's Triad (Late, Severe ICP)

Cushing's Triad = hypertension (widening pulse pressure) + bradycardia + irregular respirations
This is a late compensatory response to prevent brainstem ischemia. It signals imminent herniation. Do NOT wait for all three — act on two findings.

ICP Management Nursing Interventions

HOB 30–45° (neutral head position — avoid neck flexion/rotation)
Avoid Valsalva: stool softeners, no nasotracheal suctioning, minimize coughing
Maintain CPP 60–70 mmHg: vasopressors to raise MAP if ICP is elevated
Avoid hypoxia (SpO2 >95%) and hypercapnia (target PaCO2 35–40; brief hyperventilation to 30–35 for herniation)
Avoid hyperthermia — fever increases cerebral metabolic demand (tylenol, cooling blankets)
Osmotherapy: mannitol 0.25–1 g/kg IV or 3% hypertonic saline bolus (draws fluid out of brain cells)
Seizure prophylaxis (levetiracetam) in TBI
Sedation/analgesia: fentanyl + propofol or midazolam (reduces metabolic demand)
Maintain normoglycemia
Neurosurgical consult for surgical decompression if indicated (hematoma, herniation)

6. Stroke Recognition

FAST and BE-FAST Assessment

BE-FAST:

Balance — sudden loss of balance or coordination
Eyes — sudden vision loss or double vision
Face — facial drooping; ask to smile (asymmetric = positive)
Arm — arm weakness; ask to raise both arms (drift = positive)
Speech — slurred, wrong words, aphasia
Time — call 911/activate stroke code IMMEDIATELY; note exact time of onset

NIHSS — NIH Stroke Scale

11-item neurological exam (scored 0–42). Assess: consciousness, gaze, visual fields, facial palsy, arm/leg motor, limb ataxia, sensory, best language, dysarthria, extinction. Score guides treatment decisions and prognosis. <5 = minor; >16 = major stroke.

Ischemic vs Hemorrhagic Stroke

Feature	Ischemic (87%)	Hemorrhagic (13%)
Onset	Often on awakening; gradual to sudden	Often sudden; activity-related
Headache	Mild or absent	Severe, "thunderclap" (SAH)
LOC	Preserved early	Often decreased from onset
CT findings	Normal early (<6 hr); dark area later	Bright (white) area immediately
Treatment	tPA (within 4.5 hr if eligible), thrombectomy	BP control, neurosurgery if indicated; NO tPA

CT scan is done BEFORE tPA: Must rule out hemorrhagic stroke before giving thrombolytics. If CT shows blood → hemorrhagic → NO tPA ever. Time is brain — every minute = ~1.9 million neurons lost.

7. Motor and Sensory Assessment

Grading Muscle Strength

Grade	Description
5/5	Normal strength against full resistance
4/5	Movement against some resistance
3/5	Movement against gravity only (no resistance)
2/5	Movement with gravity eliminated (horizontal plane)
1/5	Visible muscle twitch/flicker, no movement
0/5	No movement, no twitch

Upper vs Lower Motor Neuron Lesions

Feature	Upper Motor Neuron (UMN)	Lower Motor Neuron (LMN)
Location	Brain or spinal cord above anterior horn	Anterior horn cell, nerve root, peripheral nerve
Tone	Spastic (increased)	Flaccid (decreased)
Reflexes	Hyperreflexia	Hyporeflexia or areflexia
Babinski	Positive (upgoing toe — ABNORMAL in adults)	Negative
Atrophy	Mild (disuse)	Significant (denervation)
Fasciculations	Absent	Present (denervation potentials)
Examples	Stroke, MS, spinal cord injury above T1	Guillain-Barré, ALS (anterior horn), herniated disc, Bell's palsy

NCLEX High-Yield Neuro Assessment Points

GCS ≤8 = coma = unable to protect airway → intubation indicated
Decorticate (GCS motor 3) = arms flex to chest = cortical injury; Decerebrate (GCS motor 2) = arms extend outward = brainstem injury (worse prognosis)
Blown pupil (unilateral fixed dilated) = uncal herniation + CN III compression = EMERGENCY
Cushing's Triad = hypertension + bradycardia + irregular respirations = late ICP sign = imminent herniation
HOB position in ICP: 30–45 degrees with neutral head alignment
Avoid Valsalva in ICP patient: stool softeners, avoid nasotracheal suction, elevate HOB
Most sensitive early ICP sign: subtle change in LOC/personality
tPA for ischemic stroke: must get CT scan first to rule out hemorrhagic stroke
Tongue deviates TOWARD lesion side in LMN hypoglossal (CN XII) injury
Babinski sign positive (toe extends upward) in adults = upper motor neuron lesion (stroke, spinal cord injury)

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Neurological Assessment Nursing Guide 2026

1. Level of Consciousness (LOC)

2. Glasgow Coma Scale (GCS)

3. Pupil Assessment

Normal Pupils

Abnormal Pupil Findings

4. Cranial Nerve Assessment

5. Increased Intracranial Pressure (ICP)

Normal ICP and Cerebral Perfusion Pressure (CPP)

Signs of Increased ICP (Early vs Late)

Cushing's Triad (Late, Severe ICP)

ICP Management Nursing Interventions

6. Stroke Recognition

FAST and BE-FAST Assessment

NIHSS — NIH Stroke Scale

Ischemic vs Hemorrhagic Stroke

7. Motor and Sensory Assessment

Grading Muscle Strength

Upper vs Lower Motor Neuron Lesions

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