Electromyography (EMG) Electromyography (EMG) is a technique for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed using an instrument called an electromyograph, to produce a record called an electromyogram. An electromyograph detects the electrical potential generated by muscle cells when these cells are electrically or neurologically activated. The signals can be analyzed to detect medical abnormalities, activation level, and recruitment order or to analyze the biomechanics of human or animal movement.
Electrophysiologic Testing–Electromyography (EMG) and Nerve Conductions Studies (NCS)
- These tests are done to help diagnose nerve and muscle problems that might cause symptoms of numbness, tingling, pain, weakness, and/or cramping.
- NCSs show how the body’s nerves are working. The testing physician will apply small electrical shocks and record from surface electrodes touching the skin. No needles are involved, but there may be some discomfort from the shocks.
- EMG studies are done on some patients to examine the muscle for signs of weakness and other abnormalities. The EMG test consists of a thin needle inserted into a muscle and recording how it works. Shocks are not administered during EMG testing. The EMG needles are much thinner than the needles that would be used to draw your blood. A new sterile needle is used for each patient and is discarded after the test. There may some discomfort when the needle is inserted.
- How to Prepare for the Test:
- Take a bath or shower to remove oil from your skin.
- Do not use body lotion or powder on your arms or legs on the day of the test
- Provide a list of all your medications, especially if you are taking aspirin, blood thinners (like Coumadin), or have a bleeding disorder (such as hemophilia). Tell the physician if you are taking Coumadin or aspirin.
- Medications can be taken the day of the testing unless your referring physician tells you differently. If you have myasthenia gravis, it is especially important that you ask your referring physician if you should take your medication on the day of the test.
We can perform electomyography (EMG) procedures on site for your convenience. Please schedule your appointment today.