Electromyography (EMG) - Nuffield Health

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1. Home
2. Tests and Scans
3. Electromyography (EMG)

Electromyography (EMG)

• Overview

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An electromyography is a test to measure your muscle activity at rest and during use.

It may be performed after anerve conduction studyto diagnose and treat conditions such ascarpal tunnel syndrome, nerve injury orsciatica.

What happens during an electromyography?

An electromyography takes 30-60 minutes. It is usually performed as an outpatient meaning you can go home the day of the test.

Be sure and wear loose clothing so that you can move and engage any muscles that are being tested.

You will lie down or sit in a chair, depending on the area being tested. It is important to relax any muscles so that the activity levels can be measured both in a relaxed state and when the muscle is engaged.

A thin electrode needle will be inserted into the muscle. The electrode is attached by a wire to a machine. The technician will ask you to engage (contract or tighten) the muscle. The electrical activity is recorded by the machine.

They may need to move the electrode several times to ensure the activity is accurately recorded.

When the test is done, any electrodes are removed and the area will be cleaned. The insertion area may be slightly sore. You may feel a numbness or slight tingling in your muscles for 1-2 hours after the test. Be sure and let us know if you have any swelling or increased pain.

The technician may be able to tell you the results of the test before you leave. A complete report on your EMG will be sent to the consultant that ordered the test.

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