How is a clinical neurophysiology examination performed?

A physician first takes a medical history and performs a neurological exam. If indicated, EEG, EMG, nerve conduction studies or evoked potentials are scheduled. Each test has a distinct procedure and duration; results are interpreted by the specialist.

Are EEG or EMG painful?

EEG is usually painless. Needle EMG can cause brief discomfort or soreness when small electrodes are used, but most people tolerate it well. Sensitivity varies between individuals.

Do I need to prepare before tests?

Typical preparation includes clean, product-free hair for EEG, and informing the team about medications you take. Some tests may require specific instructions from your clinician, such as temporary adjustment of certain medicines or fasting in rare cases.

When should I go to the emergency department?

Go to emergency services for sudden severe neurological signs like abrupt weakness, slurred speech, sudden vision loss, major changes in consciousness, or prolonged seizures. These require urgent assessment rather than routine outpatient testing.

Health guide

Clinical Neurophysiology

Clinical neurophysiology studies the electrical activity of the brain, spinal cord, peripheral nerves and muscles. This page explains common reasons to consult, the main electrophysiological tests, typical preparation steps and how results are used alongside clinical care.

What is clinical neurophysiology?

This specialty evaluates electrical signals produced by the nervous system and muscles. Common techniques include electroencephalography (EEG), electromyography (EMG), nerve conduction studies and evoked potentials. These tests measure signal transmission and electrical responses to help clarify functional problems and guide clinicians from neurology, neurosurgery and rehabilitation.

When to consult a specialist

Assessment is often recommended for recurrent seizures or unexplained spells, persistent dizziness, new or progressive muscle weakness, numbness or tingling, involuntary muscle activity, or suspected peripheral nerve injury. Sudden severe neurological changes—such as abrupt weakness, loss of speech, sudden vision loss or major changes in consciousness—require immediate emergency evaluation rather than routine outpatient testing.

Common tests and how they are done

EEG records brain electrical activity using electrodes placed on the scalp and is typically painless. EMG measures muscle electrical activity and may use fine needle electrodes, which can cause brief discomfort. Nerve conduction studies use surface electrodes to assess how fast and how well nerves transmit electrical signals. Evoked potentials record responses to visual, auditory or sensory stimuli. Test duration and preparation vary; you may be asked to wash hair, avoid hair products, or discuss medications that affect test results with the clinician.

How test results are used in care

Electrophysiological findings are interpreted together with clinical examination and imaging when needed. Results can help classify nerve or muscle disorders, inform surgical planning, track disease progression, or direct referrals to neurology, physical medicine and rehabilitation, or other specialties. A specialist will discuss next steps based on combined clinical and test information.

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