NCV (Nerve Conduction Velocity test) is used for diagnosis when the primary symptoms involve sensations such as pain, tingling and numbness rather than weakness. Some examples include alcoholic neuropathy, carpel tunnel syndrome, brachial plexopathy, cervical spondylosis, muscular dystrophy, myasthenia gravis, peripheral neauropathy, polymyositis, etc.
EEG (Electro-Encephalogram) helps measuring and recording brain’s electrical activity. It’s used to diagnose epilepsy, problems of consciousness or dementia, sleep disorders such as narcolepsy, etc. It aids in recording the brain’s electrical activity on paper in the form of wavy lines or over the screen.
EMG (Electromyography) is for patients with symptoms of muscle weakness, stiffness, or atrophy. Often, this testing is done for diagnosing muscle and nerve disorders such as myasthenia gravis, muscular dystrophy, myotonia, neuropathies, and myopathies.