A PATIENT GUIDE TO NERVE CONDUCTION AND EMG TESTING

What is a Nerve Conduction test?

A nerve conduction test is an electrical test used to detect abnormalities in nerve function.  An electrical stimulator placed over a nerve supplies a small electrical impulse, which travels down the nerve and is recorded by electrodes placed on the skin at a distant site.  A tingling sensation, or at times mild discomfort, is experienced with the electrical impulse.  The distance between the stimulator and the recording electrode, along with the time is takes for the signal to travel down the nerve, is used to calculate the speed of the nerve impulse.  The speed of the nerve conduction and the size of the recorded response indicate the health of the nerve.

What is an EMG Test?

An EMG (electromyogram) is a test that uses a thin needle to record electrical sounds from various muscles.  The needle acts like an antenna to detect and transmit signals in the muscle and provide information about the health of the muscle and the nerve which connects to it.  The needles are not hollow and are thinner than the needles used to draw blood.  Most patients find this test only mildly uncomfortable.

Who will perform the test?

The EMG test is performed by a specialized physician, the Electromyographer, who has completed extensive training in NCV/EMG testing.  At some offices, parts of the test (the nerve conduction testing) are performed by a nurse or a technician.  At the Neurology and Electromyography Clinic, P.A., the entire test is performed by Dr. Bryan Atkinson.  Dr. Atkinson has performed thousands of tests and can accurately complete your study with the minimum possible discomfort.

How long does the test take to complete?

A combined NCV/EMG study usually takes from 40 minutes to one hour to complete.

What is needed to prepare for the test?

Few preparations are needed on the day you have your test.  Generally, keeping the area to be tested warm and free of lotions provides the best results.  You do not need to fast, and you can plan on resuming your usual activities after the test.  You can drive yourself to and from the test, so it is not necessary that you bring a relative or friend along.

Do medications interfere with the test?

Medications prescribed by your physician may be continued as directed without interfering with the test.  You should inform Dr. Atkinson if you are taking a blood thinner when needle EMG is performed.  There are no specific medication precautions for nerve conduction studies.  Pain medication is not needed or recommended for the test, but may be continued if routinely taken.

Is the test safe?

The test is considered safe, and minimal to no risk is incurred.  The small amount of electrical current derived is always at a very safe level and will no interfere with pacemakers or other implanted devices.

How soon do I find out the results?

Although Dr. Atkinson has a general idea of what the findings are during the test, the final results are arrived at only after additional review following the completion of the study.  The results are usually available later in the day of the test or the next day.  Your results will be provided to the referring physician or other specialists after this final review is complete.

What if I have other questions before the test?

Any additional questions can be answered by Dr. Atkinson when you are seen in the office or can be answered by phone before you arrive.