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: Help diagnose the cause of pain, cramping, numbness, or weaknessDetermine if nerves are working properlyIdentify the difference between muscle and nerve disordersMonitor if a nerve is recovering from injury
There are no major complications associated with this test.
Before your procedure: Make sure you talk to your doctor about the medications you are taking.
If you have
myasthenia gravis, ask if you should take any medication before the test.
If directed to, avoid cigarettes, coffee, tea, and soft drinks for 2-3 hours before the test.Shower the day of your test. Do not use any creams, moisturizers, or powders on your skin.
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. Stimulus will be used at different places to determine the specific site of the damage.
Nerve conduction studies are often done along with
You will be able to resume your daily activities after the test is complete.
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 emergency medical services right away.
Electrodiagnostic testing. American Academy of Orthopaedic Surgeons website. Available at:
Updated October 2007. Accessed June 23, 2015.
Specialized nerve tests: EMG, NCV, and SSEP. North American Spine Society website. Available at:
Updated June 16, 2011. Accessed June 23, 2015.
Spinal diagnostics: nerve conduction studies. Cedars-Sinai website. Available at:
http://www.cedars-sinai.edu/Patients/Programs-and-Services/Spine-Center/Conditions-and-Treatments/Diagnostic-Studies/Spinal-Diagnostics-Nerve-Conduction-Studies.aspx. Accessed June 23, 2015.
Last reviewed June 2015 by Rimas Lukas, MD; Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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