Ann Clin Neurophysiol.  2018 Jul;20(2):71-78. 10.14253/acn.2018.20.2.71.

Nerve conduction studies: basic principal and clinical usefulness

  • 1Department of Neurology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
  • 2Department of Neurology, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
  • 3Department of Neurology, Seoul Medical Center, Seoul, Korea.
  • 4Department of Neurology, Soonchunhyang University Hospital Cheonan, Soonchunhyang University College of Medicine, Cheonan, Korea.
  • 5Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
  • 6Department of Neurology, Hallym University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
  • 7Department of Neurology, Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea.
  • 8Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.


Nerve conduction study (NCS) is an electrophysiological tool to assess the overall function of cranial and peripheral nervous system, therefore NCS has been diagnostically helpful in the identification and characterization of disorders involving nerve roots, peripheral nerves, muscle and neuromuscular junction, and are frequently accompanied by a needle Electromyography. Furthermore, NCS could provide valuable quantitative and qualitative results into neuromuscular function. Usually, motor, sensory, or mixed nerve studies can be performed with using NCS, stimulating the nerves with the recording electrodes placed over a distal muscle, a cutaneous sensory nerve, or the entire mixed nerve, respectively. And these findings of motor, sensory, and mixed nerve studies often show different and distinct patterns of specific abnormalities indicating the neuromuscular disorders. The purpose of this special article is to review the neurophysiologic usefulness of NCS, to outline the technical factors associated with the performance of NCS, and to demonstrate characteristic NCS changes in the setting of various neuromuscular conditions.


Nerve conduction study; NCS; Peripheral nerve; Electrophysiology; Neuromuscular disorders

MeSH Terms

Neural Conduction*
Neuromuscular Junction
Peripheral Nerves
Peripheral Nervous System
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