What to Expect from an EMG and Nerve Conduction Study

An electromyography (EMG) and nerve conduction study (NCS) are two tests, usually done together, that show how well your nerves and muscles are working. They are among the most useful tools a neurologist has for finding the source of numbness, tingling, weakness, or pain — and Dr. Varela performs and interprets them as a subspecialty.

What the tests measure

The nerve conduction study sends tiny, brief electrical pulses along a nerve and records how fast and how strongly the signal travels. The EMG uses a very thin needle electrode to listen to the electrical activity of a muscle, both at rest and while you gently contract it. Together they tell your neurologist whether a problem is coming from the nerve, the muscle, or the junction between them.

Why your neurologist may recommend one

An EMG/NCS is often ordered when symptoms point to a nerve or muscle. Common reasons include:

• Carpal tunnel syndrome and other pinched nerves
• Numbness or tingling in the hands or feet (peripheral neuropathy)
• Weakness without an obvious cause
• Radiating pain from the neck or lower back (radiculopathy)
• Following up on abnormal reflexes or muscle changes

How to prepare

Preparation is simple. On the day of the test, shower normally but skip lotions, oils, or creams on your skin, since they interfere with the recording. Wear loose clothing that lets the technician reach your arms and legs. Let the office know beforehand if you take blood thinners or have a pacemaker or other implanted device — the study can still be done safely, but your neurologist will adjust the approach.

What it feels like

Most people tolerate the study well. During the nerve conduction portion you will feel brief pulses, like a quick tap or a small static shock. The needle EMG feels like a fine pinprick, with mild aching as the muscle is tested. The whole appointment usually takes 30 to 60 minutes, and you can drive yourself home and return to normal activity right away.

Getting your results

Because the same neurologist runs and reads the study, results are interpreted in the context of your full history — not just a number on a page. Your neurologist will explain what the findings mean and the next step, whether that is a treatment plan, imaging, or simple reassurance.