Nerve Conduction Study (NCS)
A nerve conduction study is used for the diagnosis of a variety of peripheral nerve problems. This study can give an overall impression of nerve function, but it can also be used for diagnosing localised nerve entrapments. NCS is typically performed by using an externally generated electrical pulse to cause a nearby nerve to discharge, resulting in propagation of a signal proximally or distally along the nerve in question. These signals are then recorded by skin or muscle electrodes which are placed further along the nerve being tested. NCS is typically performed for symptoms such as tingling and numbness, weakness and muscle wasting, in conjunction with EMG studies.