Nerve conduction velocity (NCV) is a test to see how fast electrical signals move through a nerve. This test is done along with EMG to assess the muscles for abnormalities. Adhesive patches called surface electrodes are placed on the skin over nerves or muscles at different spots. A very mild electrical impulse is applied via other patches or a handheld stimulator to stimulate the nerve. The resulting electrical activity of the nerve is recorded by the electrodes. The distance between electrodes and the time it takes for electrical impulses to travel between electrodes are used to measure the speed of the nerve signals. It is normal for several different nerves to be tested. EMG is the recording from needles placed into the muscles. This is often done during the same visit as NCV.
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