EMG/NCS – FREQUENTLY ASKED QUESTIONS

What does the EMG/NCS test?
The EMG/NCS study examines the integrity of the peripheral nerves and muscles of the
body. The study does NOT examine the brain or spinal cord. It is important to realize
that you can have a nerve or muscle problem, even though you may not “think” you have
any nerve or muscle problems. This test does NOT measure pain. You may have a
normal EMG-NCS study, even though you have severe pain.
What are the different parts of the study?
The study is usually done in two parts: (1) NCS, and (2) EMG (i.e. “needle” exam).
How long is the study?
Each EMG/NCS study varies from patient to patient, depending on what results are
obtained. As such, the study may take as little as 20 minutes, or as much as 2 hours.
What is the Nerve Conduction Study or NCS?

The NCS involves examining the nerves in your arms or legs. This consists of attaching
wires to the surface of your skin, and administering a small “shock” to see how well the
nerves react and function. These results are monitored on a computer.
What is the Electromyography or EMG?
The EMG examines the muscle activity in your body. This study consists of inserting a
sterile, individually wrapped, needle into your various muscles and monitoring their
activity. These results are monitored on a computer. You will probably be stuck 5-7
times per arm or leg. There is NO shocking during the EMG.
Is the EMG or NCS painful?
The “shocks” during the NCS are not painful, although they may feel slightly
uncomfortable. The needle “sticks” during the EMG feels like a small ant bite, and can
sometimes be uncomfortable, but not painful.
Do I have to tell the Doctor about any specific medical conditions?
Yes, Please notify the physician prior to the study if:
1) you think you may have AIDS or hepatitis, or
2) if you are taking any blood thinners, such as Coumadin or Aspirin
What type of clothing should I wear?
Men: If possible, wear shorts and T-shirt.
Women: If possible, wear a loose dress and T-shirt.
****Please remove any watches or rings you might be wearing on BOTH your
hands/fingers****
Can I wear lotion on my arms or legs on the day of the study?
Please DO NOT use any Lotion or Cream on the day of the test. Such Lotions or Creams
will make it difficult to perform the study.
What do I need to do before I enter the exam room?
If you have accidentally used any type of lotion or cream on your hands or feet, PLEASE
wash BOTH your hands and feet with soap and water in the office restroom, BEFORE
entering the exam room.
When will I have the results?
The physician who ordered the test should have the results within the next seven working
days.