01Purpose and principlesWhat the assessment is for and the core concepts behind it.
A complete neurological examination is not every possible manoeuvre. It is a consistent screening core plus targeted depth derived from the history. A patient with transient monocular visual loss needs acuity, pupils, fields, fundoscopy and vascular assessment; someone with foot drop needs gait, root and named-nerve power, reflexes and mapped sensation. The examiner should nevertheless sample distant regions so that multifocal disease is not missed.
Reliability depends on technique and context. Pain, arthritis, language barriers, deafness, visual impairment, fatigue, sedatives and delirium can alter performance. Position the joint, demonstrate the task, stabilise proximal segments and compare like with like. When cooperation is limited, spontaneous movement, withdrawal, tone, reflexes and collateral observations still provide useful information, but inferred findings must not be recorded as formally tested.
The examination is dynamic. In acute stroke, seizure recovery, intoxication, raised intracranial pressure, neuromuscular respiratory disease and evolving cord compression, serial examinations using the same landmarks are more informative than a single exhaustive assessment. Time-stamp the findings and document glucose, oxygenation, sedation, analgesia and other physiological factors that may explain change.
Communication is part of examination quality. A useful conclusion might state that there is right face-and-arm pyramidal weakness with expressive language disturbance, no meningism and no evident sensory level, supporting a left hemispheric syndrome. This helps colleagues choose urgency and imaging; an unstructured catalogue of normal tests does not.
Key points
- Begin before touch: note alertness, interaction, speech, posture, spontaneous movement, asymmetry, involuntary movements, respiratory effort, walking aids and how the patient transfers.
- Confirm identity, explain the purpose, seek consent, offer a chaperone where appropriate, expose only what is necessary and adapt positioning, hearing, vision and communication support to the patient.
- Use a fixed core sequence—mental status, cranial nerves, upper limbs, lower limbs, coordination, gait and relevant special tests—but expand or reorder it when physiology or the presenting problem demands.
- Compare sides and test from an expected normal area toward abnormal. Recheck surprising findings and distinguish 'not tested', 'unable because of pain' and a genuine neurological deficit.
- For each limb record inspection, tone, power by named movement, reflexes, plantar responses and sensation by modality; the phrase 'neurology normal' is not a defensible examination record.
- Power grading requires maximal voluntary effort, good positioning and pain control. Look for drift, fatigability, pyramidal distribution and functional inconsistency rather than relying on a single MRC number.
- Reflexes are interpreted as a pattern. Reinforcement can reveal a present reflex; clonus and an extensor plantar response add central evidence, while absent reflexes require intact technique and relaxation.
- Cranial assessment should include fields, pupils and eye movements as well as face, hearing, palate, tongue and speech; visual acuity and fundoscopy are added when symptoms or raised-pressure risk justify them.
- Never omit gait merely because limb testing on the couch is normal. Observe initiation, base, stride, arm swing, turning and tandem or heel-toe tasks only when safe.
- Finish by summarising positive and important negative findings, localising them, stating limitations and arranging repeat examination or escalation rather than simply listing every manoeuvre.
02Indications, selection and cautionsWhen it is useful, when urgency changes and important limitations.
Impaired attention, orientation, language, memory, praxis, visuospatial awareness or behaviour can be diffuse or focal. Establish whether the patient can engage before interpreting complex commands, cortical sensation or apparent limb weakness.
Pronator drift, weakness following a pyramidal distribution, velocity-dependent increased tone, brisk reflexes, clonus and an extensor plantar response support corticospinal dysfunction, although not every component is present early.
Focal or segmental weakness with wasting, fasciculation, low tone and reduced reflexes suggests anterior horn, root, plexus or peripheral nerve disease; sensory territory and pain help separate these locations.
Gaze-evoked nystagmus, scanning dysarthria, dysmetria, intention tremor, dysdiadochokinesia and a broad-based gait support cerebellar dysfunction, but weakness, sensory loss, vestibular disease and medicines can impair the same tasks.
Headache, photophobia, fever and neck stiffness raise meningitis or subarachnoid haemorrhage concern. Absence of classic meningism, especially in older, immunocompromised or obtunded patients, does not safely exclude either emergency.
Wet or nasal voice, weak palatal movement, poor cough, pooling secretions, fatigable counting, neck flexion weakness or paradoxical breathing can precede gas-exchange abnormalities and needs urgent respiratory assessment.
03Method and interpretationA systematic approach to the test and its findings.
Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.
- 01
Structured conscious-level and cognitive screeningFirst step - Why
- Quantify arousal, attention and focal higher-function abnormalities before interpreting the remainder of the examination.
- Interpretation and limitations
- GCS describes responsiveness rather than cause and can hide focal deficits. Use a delirium tool such as 4AT in the appropriate context and add targeted language, neglect and memory testing instead of substituting one total score.
- 02
Visual acuity, fields, pupils and fundoscopy - Why
- Assess afferent visual pathways, ocular motor function and signs of optic-nerve or raised-pressure disease.
- Interpretation and limitations
- Corrected acuity should be recorded for each eye. Confrontation fields are screening tests; an afferent pupillary defect localises asymmetrical afferent dysfunction, while suspected papilloedema requires competent review and urgent clinical context.
- 03
Standardised motor examination - Why
- Map muscle groups, tone and reflex arcs so central and peripheral patterns can be distinguished and trended.
- Interpretation and limitations
- Record named movements and modifiers such as pain, fatigue or poor comprehension. MRC grades are ordinal and examiner-dependent; a one-grade change is meaningful only when technique and patient state are comparable.
- 04
Mapped primary and cortical sensation - Why
- Define territory and modality across peripheral nerve, root, cord, brainstem, thalamic and cortical levels.
- Interpretation and limitations
- Test light touch plus a modality suited to the question, such as pinprick, vibration or joint position. Extinction, stereognosis and graphesthesia require preserved primary sensation and sufficient attention.
- 05
Coordination, stance and gait observation - Why
- Integrate cerebellar, vestibular, sensory, motor and extrapyramidal function in a real task.
- Interpretation and limitations
- Dysmetria is not interpretable when weakness or severe visual loss explains target error. Guard against falls and omit unsafe tandem, heel or toe walking while documenting the reason.
- 06
Focused bedside respiratory assessment - Why
- Detect neuromuscular ventilatory risk in bulbar, neck or rapidly progressive limb weakness.
- Interpretation and limitations
- Speech, cough and respiratory pattern provide warnings, but use locally specified serial spirometric measures and critical-care thresholds. Normal oxygen saturation does not rule out early hypoventilation.
04Clinical next stepsHow the result changes management or prompts escalation.
01Acute focal presentationExamine without delaying reperfusion decisionsFirst stepNew face, arm, leg, speech, visual, neglect, gaze, balance or brainstem dysfunction of sudden or uncertain onset.+
- 1Perform ABCDE and glucose, document last known well and rapidly test conscious level, language, gaze, fields, face, all limbs, sensation, coordination and neglect using a stroke-pathway framework.
- 2Activate local stroke imaging and specialist review immediately; do not extend the bedside examination with low-yield manoeuvres when this would delay CT, angiography or transfer.
- 3Time-stamp and repeat the core deficit after imaging, treatment or deterioration, including swallow safety and any posterior-circulation features that a brief screen may miss.
02Progressive general neurologyUse a complete core with targeted expansionSubacute or chronic weakness, numbness, gait change, tremor, cognitive symptom or episodic neurological complaint without current instability.+
- 1Convert the history into two or three localisation hypotheses, then examine higher function, cranial nerves, all limbs, coordination and gait sufficiently to test each while screening for distant abnormalities.
- 2Repeat inconsistent findings after repositioning, demonstration and rest; record pain, fatigue, comprehension and positive functional signs without declaring intentional production.
- 3Summarise syndrome and anatomical level, choose targeted investigations or referral from that conclusion, and give a specific safety net for rapid progression or new emergency features.
03Reduced cooperationExtract valid signs and state limitsDelirium, aphasia, reduced consciousness, severe pain, communication disability or distress prevents a conventional examination.+
- 1Correct immediate physiological threats and optimise hearing, vision, interpreter support, analgesia and positioning; seek collateral observations of baseline function and symptom onset.
- 2Observe arousal, gaze, pupils, facial symmetry, spontaneous limb movement and response to appropriately applied stimulus, then test tone, reflexes and plantar responses without repeatedly causing distress.
- 3EscalationDocument precisely which elements were observed, elicited or not possible, escalate any asymmetry or deterioration and arrange reassessment when the limiting factor improves.
05Risks, monitoring and follow-upComplications, safety checks and further assessment.
- Use the same named muscle movements, sensory landmarks and conscious-level descriptors on serial reviews so genuine change can be separated from inter-examiner variation.
- Trend speech, swallowing, cough, respiratory pattern and locally approved ventilatory measurements when bulbar or neuromuscular weakness is present.
- Recheck pupils, eye movements, limb asymmetry and consciousness urgently after headache progression, vomiting, seizure, trauma or any clinical deterioration.
- Record gait aid, assistance required and falls risk on every relevant reassessment; apparent gait improvement may simply reflect different support.
- Document examination limitations and a plan to complete missing components, particularly fundoscopy, gait or cortical function that was unsafe or impossible initially.
- After handover or transfer, communicate the exact baseline and timing rather than only a diagnostic label, enabling the next clinician to recognise evolution.
06Special situationsVariants, exceptions and circumstances that change the usual approach.
Inspection is already examination
The way a patient reaches for belongings, turns, speaks and walks into the room may reveal neglect, bradykinesia, ataxia, pain-limited movement or inconsistency before formal testing begins.
Drift adds information
Pronator drift can reveal subtle corticospinal weakness, while downward drift without pronation, erratic movement or improvement with distraction has a different interpretation and requires the complete context.
Tone depends on speed
Spasticity is velocity-dependent and may show a catch; rigidity is more uniform through range. Pain, inability to relax and paratonia can mimic abnormal tone.
The plantar response is technical
Use a firm stimulus along the lateral sole and distinguish great-toe extension from withdrawal of the entire limb. Equivocal responses should be recorded as such, not forced into normal or abnormal.
Romberg is not cerebellar
Marked worsening only after closing the eyes supports impaired proprioceptive or vestibular input. A patient with substantial cerebellar truncal ataxia is usually unsteady with eyes open as well.
Negative findings need purpose
Absence of neglect, aphasia or a sensory level is valuable when it tests a competing localisation. Long lists of unrelated normal signs obscure rather than strengthen clinical reasoning.
07Common pitfallsFrequent interpretation and management errors.
- 01
Completing a memorised sequence despite a time-critical stroke, airway problem or falling conscious level.
- 02
Recording power as globally normal after testing only hand grip and ankle movement.
- 03
Interpreting poor task performance as weakness without accounting for pain, comprehension, neglect or apraxia.
- 04
Calling coordination abnormal when target error is fully explained by paresis or visual loss.
- 05
Skipping gait and stance in a mobile patient whose main symptom is imbalance or falls.
- 06
Documenting pupils as reactive without size, symmetry or the lighting and visual context when these matter.
- 07
Using 'unable to assess' without explaining the barrier or arranging a repeat examination.