A nerve conduction study (NCS) is a test that measures the speed and strength of electrical activity in a nerve. The test can gather information about the structure and function of both muscle and nerve.
Electromyogram of Shoulder—Used in Conjunction with Nerve Conduction Study
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A NCS is most often done to:
Before your procedure:
Your skin will be cleaned. Electrodes will be taped to the skin along the nerves that are being studied. A small stimulus will be used to apply an electric current that causes the nerves to activate. The electrodes will measure the current that travels down the nerve pathway. The current will be slower and weaker if your nerve is damaged. Your doctor will use the stimulus at different places to determine the specific site of the damage.
Nerve conduction studies are often done along with electromyography (EMG).
You will be able to resume your daily activities after the test is complete.
About 30-90 minutes
You will feel mild discomfort from the shocks. It should not be very painful.
Your doctor will study the information from the test. A report should be ready within a few days.
Call your doctor if you have any questions or concerns following the test.
In case of an emergency, call for medical help right away.
American Chronic Pain Association
National Institute of Neurological Disorders and Stroke
Canadian Neurological Sciences Federation
Chronic Pain Association of Canada
Electrodiagnostic testing. American Academy of Orthopaedic Surgeons website. Available at: http://orthoinfo.aaos.org/topic.cfm?topic=A00270. Updated October 2007. Accessed August 6, 2013.
Specialized nerve tests: EMG, NCV, and SSEP. North American Spine Society website. Available at: http://www.knowyou.... Updated June 16, 2011. Accessed August 6, 2013.
Spinal diagnostics: nerve conduction studies. Cedars-Sinai website. Available at: http://www.cedars-.... Accessed August 6, 2013.
Last reviewed August 2013 by Rimas Lukas, MD; Michael Woods, MD
Last Updated: 5/11/2013