Certain factors or conditions may interfere with the results of NCV tests. This includes damage to the spinal cord, severe pain before the test, and body temperature. Tell your healthcare provider if you have a cardiac defibrillator or pacemaker, as precautions may need to be taken.
You will be asked to sign a consent form that gives your permission to do the procedure. Read the form carefully and ask questions if something is not clear. Normal body temperature must be maintained before and during the procedure, as low body temperature slows nerve conduction. Tell your healthcare provider of all medicines prescription and over-the-counter and herbal supplements that you take.
Based on your medical condition, your healthcare provider may request other preparation. An NCV procedure may be done on an outpatient basis, or as part of your stay in a hospital. Procedures may vary depending on your condition and your doctor's practices. The NCV is done by a neurologist.
This is a doctor who specializes in brain and nerve disorders. A technologist may also do some parts of the test. You will be asked to remove any clothing, jewelry, hairpins, eyeglasses, hearing aids, or other metal objects that may interfere with the procedure.
A healthcare provider will attach a recording electrode to the skin over your nerve, using a special paste. He or she will then place a stimulating electrode away from the recording electrode, at a known distance. A mild and brief electrical shock, given through the stimulating electrode, will stimulate your nerve. After the test, you may return to your previous activities, unless your healthcare provider advises you differently.
Your healthcare provider may instruct you to avoid strenuous activities for the rest of the day. Your healthcare provider may give you other instructions after the procedure, depending on your situation. Health Home Treatments, Tests and Therapies. A nerve conduction velocity NCV test — also called a nerve conduction study NCS — measures how fast an electrical impulse moves through your nerve.
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Understanding your results. Read this next. Medically reviewed by Judith Marcin, M. What Is Paresthesia? This can pick up electrical signals in the muscle either in its resting state or with activation of the muscle.
As mentioned earlier, it is useful for looking at both the nerve and the muscle but this portion of the test, being invasive, is not always employed. You will be given instructions on how to prepare for the test. You should not use creams or emollients on your hands and feet the most common sites of your nerve tests on the day of the test, and preferably since your last shower or bath. Generally speaking, there are no other preparations of note. Please advise the neurologist performing the test if you have a pacemaker or other similar devices.
If you are taking warfarin, heparin or some other medication to thin your blood, and if you are having a needle EMG test, you should advise both your GP and the neurologist.
A measurement of how thin your blood is may be important before that test can be performed. The NCS procedure is usually very safe and is non-invasive. Firstly, you will be told how to position yourself and the skin area will be prepared. Then some electrodes will be attached to your skin and you will be forewarned when to expect the stimulation. Many people are understandably anxious about the intensities of the small safe electrical pulses that are passed via the skin, but usually relax quickly when they know what to expect.
Here, a small needle is inserted through the skin into a muscle belly. Sterilisation of the skin and a local anaesthetic is not generally required.
Usually the consultation and procedure takes about minutes in all. More complicated assessments may demand more time. Following the test, you will be allowed to put on your garments and shoes. It should be noted that the final interpretation of the clinical meaning of the test rests with the clinician who ordered the test. This is because they can put together the whole picture. For this reason, the neurologist performing the test can only give you limited information about the meaning of the results, and may not even be able to provide any information on the next step or any possible treatments because they are unaware of all the other clinical information.
There are rarely any side effects from the NCS procedure. Although some discomfort for some appreciable is experienced during the test, there are often no complications thereafter. The doctor may avoid stimulating too close to the torso if you have a pacemaker or similar device.
Needle EMG may produce some minor bruising at the skin and muscle. Usually this is of no consequence.
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