What are EMG and NCS?
Nerve conduction studies (NCS) measure how fast electrical signals travel through nerves. Electromyography (EMG) measures electrical activity in muscles. Together they evaluate neuropathy, entrapment and neuromuscular disorders.
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When they're indicated
Peripheral neuropathy evaluation, carpal tunnel syndrome, radiculopathy, motor neuron disease, myopathy, neuromuscular junction disorders. Not routine for all tingling — examination and labs come first.
What to expect
NCS involves brief electrical stimulation of nerves — may cause mild discomfort. EMG involves a fine needle in muscles — brief discomfort. Results guide diagnosis and treatment.