It causes weakness of the foot and lower leg muscles. An inherited neurological condition that affects both the motor and sensory nerves. This causes pain and numbness in the fingers.Ĭharcot-Marie-Tooth disease. A health problem in which the median nerve, which runs from the forearm into the hand, becomes pressed or squeezed at the wrist by enlarged tendons or ligaments.

The first symptoms may include weakness or a tingling sensation in the legs.Ĭarpal tunnel syndrome. A condition in which the body's immune system attacks part of the peripheral nervous system. NCV detects a problem with the nerve, whereas an EMG detects whether the muscle is working the right way in response to the nerve's stimulus.ĭiseases or health problems that may be checked with NCV include: NCV is often used along with an EMG to tell the difference between a nerve disorder and a muscle disorder. Why might I need a nerve conduction velocity test? Both tests help find the presence, location, and extent of diseases that damage the nerves and muscles. It should usually be done during the same visit as an NCV. This measures the electrical activity in your muscles. The speed is then calculated by measuring the distance between electrodes and the time it takes for electrical impulses to travel between electrodes.Ī related test that may be done is electromyography (EMG). This is repeated for each nerve being tested. The resulting electrical activity is recorded by another electrode. One electrode stimulates your nerve with a very mild electrical impulse. Two electrodes are placed on the skin over your nerve or over a muscle. This test is also called a nerve conduction study (NCS).ĭuring the test, your nerve is stimulated, often with electrode patches put on your skin. What is a nerve conduction velocity test?Ī nerve conduction velocity (NCV) test measures how fast an electrical impulse moves through your nerve.

Ncv test painful