Nerve Conduction Studies (NCS)

A Nerve Conduction Study (NCS) is a test that evaluates the motor and sensory nerves of the human body by measuring the speed and strength of electrical activity in a nerve. The test can gather information about the structure and function of both muscle and nerve.

Nerve Conduction Studies are used mainly for evaluation of paresthesias (numbness, tingling, burning) and/or weakness of the arms and legs. The type of study required is dependent in part by the symptoms presented. A physical exam and thorough history also help to direct the investigation. Some of the common disorders which can be diagnosed by nerve conduction studies are:

  • Peripheral neuropathy

  • Carpal tunnel syndrome

  • Facioscapulohumeral muscular dystrophy

 Following are some frequently asked questions about this test.