What to Expect during an NCV Test
The particulars of nerve conduction studies can vary, but they follow the same general process:
- You’ll be asked to remove any metal objects you have on, such as jewelry, as it can interfere with the procedure.
- You may need to remove some clothings and wear a hospital gown.
- You’ll sit or lie down for the test
- Your doctor will find the nerve to be tested
- Your doctor will place two electrodes on your skin, one that stimulates the nerve and another that records the stimulation. They may use a jelly or some kind of paste to help the electrode stick to the skin.
- The nerve will be stimulated by a mild and brief electrical shock from the stimulating electrode. One common test, for example, stimulates nerves in the finger and records the stimulus with two or more electrodes near the wrist.
- The entire test takes 20 to 30 minutes on one limb. If all limbs are tested then it’ll be more than one hour. The feeling may be uncomfortable, but it isn’t painful.
Your doctor may want to perform the test in more than one location. The test is usually done along the path of the nerves on an arm or leg, depending on the condition being investigated.
In one study researchers used the NCV test to examine damage to the ulnar nerve, which provides sensation to the hands. Adding a third stimulation site to the two normally used increased the sensitivity of the test from 80 to 90 percent.
Your doctor or specialist who conducts the test will tell you when or if the test will need to be done again.