![]() A NCS detects a problem with conduction in nerves, whereas an EMG detects whether the muscle is working properly. Nerve conduction studies are performed to find the cause of symptoms such as weakness, numbness, tingling and pain. Both tests help find the presence, location and extent of diseases that damage the nerves and muscles. It is usually done at the same time as a NCS. This uses a fine recording needle to measure the electrical activity in your muscles. ![]() This is repeated for each nerve being tested.Ī related test that may be done is an electromyogram (EMG). Two sets of electrodes are placed on the skin over the nerve (or muscle) being studied - one set stimulates the nerve with a very mild electrical impulse and the other records the resulting electrical activity which is then recorded by a computer. A nerve conduction study (NCS) measures electrical impulses as they move through your nerves.
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