Your health care provider requested an Electrodiagnostic study, which commonly includes two components:
This test helps to determine if your problem affects the nerves and muscles in your body. This test is often requested when there are complaints of numbness and/or tingling, burning pain, and/or weakness.
During the NCS study, the physician tapes small electrodes on the skin and applies a brief electric stimulus to different portions of motor and sensory nerves. Nerve stimulation causes a tingling sensation. The physician evaluates the electrical responses of the tested nerves.
During the EMG study, the physician analyzes the electrical activity in muscles by inserting a fine pin electrode. Electrode insertion may cause mild temporary discomfort. The physician can determine whether the muscle, and the nerve supplying that muscle, is working properly by analyzing the electrical activity of muscle fibers on a video monitor and listening over a loudspeaker.