Electrodiagnostic Medicine/EMG information for patients

How do I prepare for the test?

  • Continue all of your usual medicines. Bring your medicine list or bottles with you.
  • Eat and drink normally. If you are diabetic or have “low blood sugar,” bring a snack.
  • Wash with soap and water.
  • Wear shorts, short sleeves and/or any clothing that will allow for easy access to most body areas, including your arms, legs, back and neck.
  • DO NOT use skin lotions, skin creams, moisturizers, or sun block. It will interfere with the test.
  • Feel free to bring a relative or friend with you.


Who performs the test?
Dr. Chester personally performs all of the testing, and interprets the results. He does not use a technician.


What is the test like and how long does it take?

  • All testing is done in a private room while you are sitting or lying down.
  • Most testing can be completed within one hour.
  • Small breaks of 4 to 5 minutes are not usually required, but are possible during the test.
  • There are usually two parts to the test:
    1. Nerve flow testing – a small amount of electrical current to “stimulate” the nerves.
    2. Muscle testing – a very thin needle into certain muscles to record nerve and muscle interaction.


What are the risks?
PROBLEMS ARE VERY RARE AND THE RISKS ARE VERY SMALL. A thin needle for the muscle testing is usually needed, so the risk of bleeding and infection is possible. If there are any other risks, Dr. Chester will tell you before he begins.


What do I do after the test?
You may go about your normal life after your appointment. Take all your medicines as prescribed. A detailed note regarding the test will be sent to your doctor. If you feel any discomfort, have any questions or concerns during normal business hours, please call our office at 808 249 8887. If you are unable to reach us, and it is a medical emergency, dial 911.