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Electromyogram (EMG) is a test that checks the health of the muscles and the nerves that control the muscles.
Nerve conduction velocity (NCV) is a test to see how fast electrical signals move through a nerve.
NCV and EMG are performed together.
How the Test is 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 muscles' ability to respond when the nerves to your muscles are stimulated.
How to Prepare for the Test?
No special preparation is usually necessary. Avoid using any creams or lotions on the day of the test.
Tell the person who is doing the test if you are taking any blood thinners.
Body temperature can affect the results of this test. If it is extremely cold outside, wait in a warm room for a while before the test is performed.
How the Test Will Feel?
You may feel some pain or discomfort when the needles are inserted, but most people are able to complete the test without significant difficulty.
Afterward, the muscle may feel tender or bruised for a few days.
Why the Test is Performed?
EMG is most often used when people have symptoms of weakness, and examination shows impaired muscle strength. It can help to tell the difference between muscle weakness caused by injury of a nerve attached to a muscle and weakness due to neurologic disorders.
Mininmal bruising. You can use icepacks on the area for minor bruising and tyelenol for pain relief if needed.