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NCS are used to evaluate the ability of the nervous system to conduct electrical impulses.
EMG is used to assess the electrical activity in muscles, and the nerve/muscle function (health of muscles and the nerve cells that control them) to know if a neuromuscular disease is present.
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These test are done together in most cases, and doing both of them will be beneficial and will give your doctor more information.
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Yes in most of these diseases they may be beneficial and this can be to either diagnose the condition or to rule out other conditions. However in some conditions such as encephalitis they are not done.
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For encephalitis imaging studies of the brain with spinal tap (lumbar puncture) may be done.