Electrodiagnostic testing, which includes electromyography (EMG) and nerve conduction studies (NCS), is a clinical tool used to evaluate the health and function of peripheral nerves and muscles. These studies help pinpoint the location and severity of nerve damage, distinguish between nerve and muscle disorders, and guide treatment decisions.
Dr. Lemberikman performs and interprets electrodiagnostic studies in the office. Common indications for testing include numbness or tingling in the hands or feet, suspected carpal tunnel syndrome, cervical or lumbar radiculopathy, peripheral neuropathy, and unexplained muscle weakness. The results provide objective data that complements the clinical examination and imaging findings.
The testing process involves placing small electrodes on the skin to measure nerve conduction velocity and inserting a thin needle electrode into specific muscles to assess electrical activity. While patients may experience mild discomfort, the procedures are generally well tolerated. Results are typically available the same day and are discussed with the patient as part of an integrated treatment plan.
What to Expect
The electrodiagnostic evaluation begins with a brief clinical interview covering your symptoms, their onset, and any prior relevant diagnoses or imaging. Dr. Lemberikman then conducts the nerve conduction study (NCS) first. During this portion, small surface electrodes are placed on the skin along the path of specific nerves. A low-level electrical pulse is applied to stimulate the nerve, and the speed and strength of the resulting signal are recorded. This part of the test is generally brief and well tolerated.
The electromyography (EMG) portion involves a thin needle electrode inserted into selected muscles. Dr. Lemberikman listens to and analyzes the electrical signals produced by the muscle at rest and during gentle contraction. This information reveals whether the muscle itself or its nerve supply is affected. The entire session typically takes 30 to 60 minutes depending on the clinical question. Results are reviewed and discussed with you the same day.
Who Can Benefit
Electrodiagnostic studies are appropriate for patients presenting with symptoms that suggest nerve or muscle involvement. Common scenarios include:
- Numbness, tingling, or burning sensations in the hands, arms, legs, or feet
- Suspected carpal tunnel syndrome or cubital tunnel syndrome
- Neck or back pain radiating into the limbs, consistent with radiculopathy
- Peripheral neuropathy, including diabetic neuropathy
- Unexplained muscle weakness or wasting
- Patients with inconclusive MRI findings who need functional nerve assessment
Frequently Asked Questions
Is the EMG test painful?
Most patients tolerate the test without significant difficulty. The nerve conduction portion produces a brief, mild electrical sensation. The needle portion of the EMG may cause momentary discomfort when the electrode is inserted, but the needle is very thin and the discomfort is typically short-lived. Dr. Lemberikman explains each step in advance so you know what to expect.
How should I prepare for electrodiagnostic testing?
No special preparation is required in most cases. You should avoid applying lotions or oils to your skin on the day of testing, as these can interfere with electrode contact. Wear or bring comfortable, loose-fitting clothing that allows access to the areas being tested. Continue taking your regular medications unless otherwise directed.
How long does it take to get results?
Results are available the same day. Dr. Lemberikman reviews the findings with you directly after the study and incorporates them into your overall treatment discussion. A written report is also generated for your records and for coordination with referring physicians.