What is “Electromyography?” (EMG)
Electromyography (EMG) is a test that checks the health of the muscles and the nerves that control the muscles.
How is this test performed?
The health care provider will insert a very thin needle electrode through the skin into the muscle. The electrode on the needle picks up the electrical activity given off by your muscles. This activity appears on a nearby monitor, and may be heard through a speaker.
After placement of the electrodes, you may be asked to contract the muscle. For example, bending your arm. The electrical activity seen on the monitor provides information about your muscle’s ability to respond when the nerves to your muscles are stimulated.
How should you prepare for the tests?
- Please inform the physician if you are taking any blood thinners (Plavix, Coumadin, aspirin, etc.), or if you have a pace-maker implanted or have been diagnosed with a bleeding disorder
- Bathe or shower before the test to remove extra oil from the skin
- Avoid applying body lotions or skin oils on the day of the test
How long do the tests take?
- Between 20 and 90 minutes depending on whether you are getting an EMG alone or an EMG combined with NCV.
- You can do any of your normal activities like eating, driving and/or exercising before and immediately after the tests.
- There are no lasting side effects of any of these tests.
