EMG and NCV are important diagnostic tools that help determine the cause of muscle weakness, spasms, paralysis, or pain in the arms, hands, legs, or face. They also help determine if the desease involves the spinal cord, nerves, muscles, or nerve muscle junctions.
This test is performed in the physician's office. Your position during the test will depend upon the area of the body to be tested. For the NCV, two electrodes will be placed in a specific location. They will pick up the electrical signal as it travels along the nerve in that area. A stimulating electrode sends a tiny electrical charge along the nerve. You may feel a tingle or your muscle may twitch. From the EMG, a tiny needle is inserted into the muscle to record the electrical activity of the muscle. The results are typically available within three to five days.