In addition to nerve conduction studies, your doctor might perform another test to record the electrical activity of your muscles.

Electromyography (EMG) involves inserting a small needle into the muscle, to view and listen to the electrical activity generated within the muscle. You might be asked to move in a certain way to contact the muscle being tested.

The test uses a small needle, so shouldn't be too uncomfortable. You might have some minor bruising, and feel a little sore for a short time after the test.

The activity we record can provide information not only about the muscle but also about the nerve that supplies it and the neuromuscular junction between the two. Depending on your symptoms and a doctor's examination, we might use EMG to test one muscle or several.

Please let us know if you're taking warfarin or might have a problem with bleeding or clotting, as there's a risk that the needle might cause problematic bleeding into the muscle.