EMG / NCV Testing

“EMG (electromyography) and NCV (nerve conduction velocity) testing are diagnostic studies used to evaluate how well nerves and muscles are functioning. These tests help identify nerve compression, nerve damage, or muscle disorders that may be contributing to symptoms such as pain, numbness, tingling, or weakness. As part of a PM&R evaluation, EMG/NCV testing provides valuable information to guide diagnosis and treatment planning.”

-Dr. Anatoly Pisman, MD

What is EMG / NCV Testing?

EMG and NCV testing are complementary diagnostic procedures used to assess the electrical activity of muscles and the speed of nerve signal transmission. Together, they help determine whether symptoms are caused by nerve dysfunction, muscle disorders, or both.

These tests are commonly performed in an outpatient setting and are an important part of evaluating patients with suspected nerve-related conditions.

Conditions Evaluated

How the Tests Work

NCV testing measures how quickly electrical signals travel through a nerve, helping identify areas where nerve conduction may be slowed or blocked. EMG testing measures the electrical activity of muscles both at rest and during contraction to assess muscle and nerve health.

During NCV testing, small surface electrodes are placed on the skin, and mild electrical impulses are used to stimulate the nerves. For EMG, a thin needle electrode is inserted into specific muscles to record electrical activity.

When EMG / NCV Testing Is Recommended

These tests are typically recommended when patients present with symptoms such as persistent numbness, tingling, weakness, or unexplained pain that may be related to nerve or muscle dysfunction.

They are often used when a physical examination alone is not sufficient to determine the exact cause of symptoms or to confirm a suspected diagnosis.

What to Expect During the Procedure

EMG and NCV testing are usually performed during the same visit and may take between 30 to 60 minutes depending on the number of areas being evaluated.

NCV testing involves surface electrodes and mild stimulation, while EMG involves a small needle electrode to assess muscle activity. Some discomfort may be felt during the procedure, but it is generally well tolerated.

Benefits of EMG / NCV Testing

These diagnostic tests provide detailed information that helps guide treatment decisions:

What to Expect at Your Visit

During your visit, your symptoms and medical history will be reviewed to determine the appropriate areas for testing. EMG and NCV studies will be performed based on your clinical presentation, and results will be used to develop a targeted diagnosis and treatment plan tailored to your condition.

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