We look forward to seeing you for your nerve and muscle test at Sweetwater Pain & Spine. This appointment involves two complementary tests — Nerve Conduction Studies (NCS) and Electromyography (EMG) — that together give your physician a detailed picture of how your nerves and muscles are functioning. This guide will help you understand what to expect and how to prepare.
Nerve Conduction Study (NCS)
Small electrodes are placed on your skin and a mild electrical stimulus is used to activate specific nerves. The test measures how quickly and how strongly electrical signals travel along the nerve. This helps identify nerve damage, compression, or entrapment — such as in carpal tunnel syndrome or peripheral neuropathy. The pulses feel like a brief flick or mild zap and are not dangerous.
Electromyography (EMG)
A small, thin needle electrode is inserted into specific muscles to measure the electrical signals they produce at rest and during gentle contraction. EMG detects whether muscle abnormalities are caused by a nerve problem, a muscle disease, or a neuromuscular junction disorder. Most patients describe the sensation as similar to acupuncture or a brief injection. Soreness is normal and temporary.
Our EMG equipment — physician-performed nerve and muscle testing at Sweetwater Pain & Spine
What we’re looking for — abnormal electrical activity in nerves or muscles reveals the cause of your pain
How to Prepare for Your Test
Wear loose-fitting, comfortable clothing that allows easy access to the limbs being tested. If your legs are being tested, wear shorts or loose pants that can be rolled up above the knee. For upper extremity testing, short sleeves or a sleeveless shirt works best.
On the day of your test, avoid applying any lotion, cream, oil, or moisturizer to the skin of the areas being tested. These products interfere with electrode contact and can reduce the accuracy of the nerve conduction results. Wash your skin with soap and water before your appointment.
There are no dietary restrictions for this test. Eat and drink as you normally would before your appointment. Staying well-hydrated is a good idea, as it can improve the quality of the nerve signals recorded.
Take all your regular medications as prescribed on the day of your test. Unlike some procedures, EMG and NCS do not require you to stop blood thinners, pain medications, or other routine medications. If you have specific questions about a medication, call our office before your appointment.
Cold skin significantly slows nerve conduction and can affect the accuracy of your test results. Avoid spending time in cold temperatures immediately before your appointment. If your hands or feet tend to run cold, let our staff know when you arrive — we can warm the area before testing begins.
No sedation or numbing medications are used for this test. You are completely awake throughout and may drive yourself to and from the appointment.
Day-of Quick Reference
✅ Please DO
- Wear loose, comfortable clothing
- Bring shorts if legs are being tested
- Eat and drink normally beforehand
- Take all regular medications as prescribed
- Arrive 10–15 minutes early to complete any paperwork
- Bring a list of your current medications
- Let staff know if you have a pacemaker or implanted device
- Tell us if you have a bleeding disorder or are on blood thinners
❌ Please DO NOT
- Apply lotion, oil, or cream to the skin being tested
- Wear compression stockings or tight-fitting sleeves
- Expose yourself to cold temperatures right before the test
- Apply nail polish if fingertip electrodes are needed
- Smoke for at least 3 hours before the test (nicotine affects circulation)
- Engage in strenuous exercise immediately beforehand
What to Expect During the Test
You will be positioned comfortably on the exam table. Your physician will review your symptoms and the reason for the test. The areas to be tested will be exposed and, if needed, warmed to ensure accurate results.
Small electrode stickers are placed on your skin over specific nerves. A handheld stimulator delivers a brief, mild electrical pulse to activate the nerve. You will feel a quick zap or flick with each stimulus. Your physician will stimulate multiple nerves and record the speed and strength of each signal. This part typically takes 10–20 minutes.
After the NCS, a small, thin needle electrode is inserted into specific muscles. You will be asked to relax completely, then gently contract the muscle. The needle records the electrical patterns your muscle produces during each phase. You may feel brief discomfort with each insertion — most patients describe it as a quick pinch or pressure. The needle is moved to different muscles based on your clinical findings.
Your physician will explain findings as the test progresses and answer any questions you have in real time. This is a physician-performed test, not a technician-run study — your doctor is interpreting results as they are being collected.
Preliminary results are often available immediately. Your physician will discuss the findings with you, explain what they mean, and outline how the results will shape your diagnosis and treatment plan going forward.
After Your Test
There are no restrictions after this test. You may drive, return to work, exercise, and eat and drink normally right away. No recovery time is needed.
Some patients experience mild muscle aching or tenderness at the needle insertion sites from the EMG portion of the test. This is normal and typically resolves within 24 to 48 hours. Occasional minor bruising can also occur. Over-the-counter pain relievers such as acetaminophen or ibuprofen can help if needed.
You may notice small red marks on the skin from electrode placement or needle insertions. These fade quickly. Keep the areas clean and dry. No bandages are needed in most cases.
A complete written report will be generated after your visit. If your test was performed as part of a consultation, your physician will integrate the findings into your overall assessment. If additional testing or treatment is recommended, our office will coordinate next steps with you.
Frequently Asked Questions
Have questions about your upcoming appointment? Our team is happy to help you feel prepared and confident before you arrive.