Nerve Conduction Velocity (NCV) Study

What Is a Nerve Conduction Velocity Test?

A nerve conduction velocity (NCV) test involves placing small electrodes on your skin to detect electrical signals as they travel through nerves in your arms or legs. A mild electric shock is used to stimulate the nerves, and a machine records the speed of the signal’s travel. This helps doctors evaluate nerve health and diagnose conditions like peripheral neuropathy, carpal tunnel syndrome, or other neuromuscular disorders.

When Might You Need This Test?

Your doctor may recommend an NCV test if you have symptoms like tingling, numbness, weakness, or pain in your hands, feet, or other body parts. It’s also used to monitor nerve function before or after treatments for conditions like diabetes, nerve injuries, or autoimmune diseases.

Preparation for the Test

No special preparation is needed, but you may be asked to avoid certain medications (like pain relievers) that could affect nerve signals. Wear loose clothing, and bring any devices (like a pacemaker) that need to be checked during the test.

What Happens During the Test?

You’ll lie down while electrodes are placed on your skin along the nerves being tested. A mild electric shock is briefly applied to stimulate the nerve, and the response is recorded on a graph. The test usually takes 30 to 60 minutes and is generally painless but may cause a slight tingling sensation.