EMG and NCS
(Electromyography and Nerve Conduction Study)

Electromyography (EMG or myogram) and Nerve conduction Study (NCS) are neurodiagnostic tests used to assess the health and function of the muscles and the nerves that control the muscles. It can be used to determine whether muscle weakness and loss of muscle strength are caused by a muscle injury or by an underlying neurological disorder.

EMG/NCS can be used to detect many disorders and conditions, including the following:

  • Carpal tunnel syndrome
  • Guillain-Barre syndrome
  • Muscular dystrophy
  • Myasthenia gravis
  • Neuropathy
  • Sciatic nerve dysfunction

TEST DURATION:

30-60 minutes

HOW TO PREPARE

  • Please inform Comprehensive Neurology Clinic several days prior to your test date if you are taking aspirin, blood thinners (such as Coumadin®), have a pacemaker, or have hemophilia.
  • Take a bath or shower to remove oils from your skin.
  • Do not use body lotion or oils on the day of the test.
  • In cold weather, wear gloves, pants, and closed toe shoes to keep your hands and feet warm before the test.

THE TEST

NERVE CONDUCTION STUDY (NCS): The nerve conduction study shows how the body’s electrical signals are traveling in the nerves. This is done by applying small electrical shocks to one point on the nerve and recording from another. These shocks cause a quick, mild tingling feeling that goes away quickly. The doctor or technologist may have to test several nerves.

EMG (Electromyography): A small, thin needle is inserted into the muscle. The electrical activity of the muscle is then recorded. You may be asked to contract the muscle to see how the contraction changes the activity. There may be a small amount of discomfort when the needed is inserted. The doctor will only examine the muscles necessary to diagnose your problem. A new needle is used for each patient, and it is discarded after the test.

AFTER THE TEST

You may resume your normal activities.