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Electromyography (EMG) measures and records the electrical activity of a muscle. The test can record a muscle's electrical activity at rest or during a muscle contraction.
An EMG is often done with nerve conduction studies . These studies can analyze the electrical activity in your nerves.
EMG of the Shoulder © 2009 Nucleus Medical Media, Inc. |
EMG is most often done to:
- Aid in diagnosing the source of pain, cramping, or weakness in the muscles and nerves
- Differentiate between true muscle weakness and limitations due to pain
- Determine if muscles are working properly
- Distinguish between muscle and nerve disorders
Call Your Doctor
After the test, call your doctor if any of the following occurs:
- Signs of infection, including fever and chills
- Redness, swelling, increasing pain, excessive bleeding, or discharge around the needle sites
