When a nerve going to a muscle is injured or if the muscle itself is diseased, the electrical firing pattern of that muscle changes. The number of needle insertions depends on the number of muscles that need to be examined. The test involves inserting small, fine needle electrodes into various muscles to record their electrical firing patters. PART II: Electromyography: This part of the study analyzes the electrical firing patters of various muscles which will be displayed on a computer screen. The health of the nerve is evaluated by recording how fast the electrical impulse travels through it. Recording electrodes are taped to the skin to detect the electrical signal. A stimulator is held against the skin on the arm or leg and sends a small, brief, harmless electrical shock along a nerve. PART I: Nerve conduction study: This part of the study is performed with the patient resting comfortably on an exam table. Please arrive 15 minutes early for in-office preparation for the test. The procedure takes approximately 30 to 90 minutes to complete depending on how many limbs are tested. ![]() Typically, the study is ordered for symptoms of neck pain, back pain, limb weakness, numbness, tingling, or muscle aches. ![]() MG/NCS studies are used to diagnose disorders of nerves, nerve roots, neuromuscular junction, and muscles.
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