Electromyography (EMG) and Nerve Conduction Studies Test
EMG and nerve conduction studies check how well your muscles and the nerves that control them are working. They measure electrical signals in muscles and nerves to find damage or disease.
What this test measures
EMG measures the electrical activity of muscles at rest and when used. Nerve conduction studies measure how fast and how well electrical signals travel along nerves.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Frequently asked questions
What do EMG and nerve conduction studies measure?
EMG measures electrical signals from muscles. Nerve conduction studies measure how fast and well electrical signals move along nerves.
Why are these tests done together?
When done together, they help providers tell if symptoms are caused by a muscle or a nerve disorder.
What does an abnormal result mean?
An abnormal result can be a sign of many conditions, such as carpal tunnel syndrome, herniated disk, Guillain-Barré syndrome, or ALS.
Do I need to do anything to prepare?
The source does not mention preparation. Ask your provider for instructions.
How long do the tests take?
The source does not specify how long the tests take.
Related lab tests
Sources
- MedlinePlus: Electromyography (EMG) and Nerve Conduction Studies — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.