About This Test
The electromyography (EMG) and nerve conduction study (NCS) services at Franciscan Health can detect problems with muscles during rest or activity. A person suffering from numbness, tingling, pain, loss of sensation or specific types of neurological disorders may have nerve or muscle damage.
We may recommend EMG or NCS for people with the following conditions:
- Amyotrophic lateral sclerosis (ALS)
- Carpal tunnel syndrome
- Herniated discs
- Muscular dystrophy
- Pinched nerves
What to expect during electromyography (EMG)
Electromyography (EMG) assesses the health of your muscles and the nerves that control your muscles. We may order an EMG to determine if muscle weakness is due to a neurological disorder.
During the test, a specialist inserts 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.
Some patients may feel discomfort during an EMG, but most people have no trouble completing the test. The area where electrodes are inserted may be bruised or feel tender for a few days afterward.
What to expect during nerve conduction studies (NCS)
Nerve conduction studies (NCS) are usually done with electromyography. NCS give physicians important information about nerve and muscle function. For example, the test can help identify whether a patient's problem is in the spinal cord, muscles or nerves.
During the test, small discs or electrodes are placed on the patient's limbs. Each electrode gives off a mild electrical impulse to stimulate the nerves underneath. The electrodes also record how long it takes impulses to travel along the nerves.
Looking at these measurements, your healthcare provider can determine the speed of the nerve's signals and ultimately identify problems that cause muscle weakness, spasms, paralysis or pain.
Our Locations
Loading Map...