What is an EMG?
Electromyography (EMG) is a diagnostic procedure to assess the health of muscles and the nerve cells that control them (motor neurons). EMG results can reveal nerve dysfunction, muscle dysfunction, or problems with nerve-to-muscle signal transmission.
Why is EMG Performed?
EMG tests are used to help diagnose a variety of conditions that affect muscle health and nerve function, such as:
- Muscle disorders, like muscular dystrophy or polymyositis
- Diseases affecting the connection between the nerve and the muscle, such as myasthenia gravis
- Disorders of nerves outside the spinal cord (peripheral nerves), such as carpal tunnel syndrome or peripheral neuropathies
- Disorders that affect the motor neurons in the brain or spinal cord, such as amyotrophic lateral sclerosis or polio
- Disorders affecting the nerve root, such as a herniated disk in the spine
The EMG Procedure: What to Expect
- Preparation: We’ll guide you on how to prepare, including any changes to medication. View EMG Patient Instructions PDF
- During the Test: Small needles are inserted into your muscles to record electrical activity. You may be asked to contract the muscle.
- Duration: The test usually takes 30 to 60 minutes.
- Comfort and Safety: Your comfort is our priority. The test is safe, and our experienced staff will be there to guide you throughout the procedure.
After the Test
You may resume your normal activities after the EMG. Some muscle soreness may be experienced but it typically resolves within a few days.