Nerve Testing – EMG and NCV Test

Results May vary from person to person. No individual result should be seen as typical. These statements have not been evaluated by the Food and Drug Administration. Below are merely personal stories and do not guarantee success.

What is nerve testing?

Nerve testing includes medical diagnostic tests to evaluate the electrical conduction and function of sensory and motor nerves of the body. Mainly, nerve testing involve two diagnostic tests i.e. Nerve Conduction Velocity (NCV) and Electromyography (EMG)

What is NCV test?

NCV test is used to detect abnormal conditions in nerves. NCV is an electrical nerve test. NCV determine nerve injuries in a person who may experience numbness or weakness in legs or arms. This test helps to discover the response of the nerve to injury or treatment and severity of the condition. Usually, this nerve testing takes around 30 minutes otherwise depends on the number of tested nerves. Basically, NCV is performed to measure the conduction speed of an electrical impulse in a nerve and to determine the nerve destruction or damage.

How is NCV performed?

During the NCV test, surface electrodes are placed on the skin to stimulate the nerve. These surface electrodes are kept over the nerves. Then a mild electrical impulse is delivered to electrodes for stimulation of the nerve. One electrode stimulates the nerve and other records it. In this way, the electrode records the resulting electrical activity. This procedure is repeated for each nerve that requires testing.

Conditions that can be evaluated by NCV

  • Carpel tunnel syndrome
  • Herniated disc disease
  • Chronic inflammatory neuropathy or polyneuropathy
  • Guillain-Barre Syndrome
  • Pinched nerves
  • Sciatic nerve problems
  • Peripheral nerve injuries

What is Electromyography?

In EMG test electrodes are used to transmit electrical signals. Active muscles of the body produce an electrical current which is proportional to the muscle activity. EMG is used to measure the electrical activity of muscles. EMG test results can reveal muscle dysfunction, nerve dysfunction or signal transmission issues with the nerve to muscle. During the test, needle electrodes are directly inserted into the muscle to record the electrical activity of the muscle.

Which conditions can be detected by EMG?

EMG can detect the irregular electrical activity of muscles that occur in conditions including muscle inflammation, peripheral nerve damage, muscular dystrophy, pinched nerves, disc herniation, myasthenia gravis and amyotrophic lateral sclerosis.