Electroneurography, or nerve conduction study (NCS) is a test commonly used to evaluate the function,
especially the ability of electrical conduction, of the motor and sensory nerves of the human body.
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,
• Ulnar neuropathy,
• Guillain-Barré syndrome,
• Facioscapulohumeral muscular dystrophy,
• Spinal disc herniation.
The nerve conduction study consists of the following components:
• Sensory NCS,
• Motor NCS,
• F-wave study,
• H-reflex study.