Electromyography

Electromyography (EMG) measures and records the electrical activity of a muscle. The test can record a muscle's electrical activity at rest or during a muscle contraction. An EMG is often done with nerve conduction studies . These studies can analyze the electrical activity in your nerves.

  • Call Your Doctor

    After the test, call your doctor if any of the following occur:

    • Signs of infection, including fever and chills
    • Redness, swelling, increasing pain, excessive bleeding, or discharge around the needle sites

  • Definition

    Electromyography (EMG) measures and records the electrical activity of a muscle. The test can record a muscle's electrical activity at rest or during a muscle contraction.


    An EMG is often done with
    nerve conduction studies
    . These studies can analyze the electrical activity in your nerves.

    EMG of the Shoulder
    EMG shoulder 2
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  • What to Expect

  • Reasons for Test

    EMG is most often done to:

    • Aid in diagnosing the source of pain, cramping, or weakness
    • Differentiate between true muscle weakness and limitations due to pain
    • Determine if muscles

      and nerves

      are working properly
    • Distinguish between muscle and nerve disorders

  • Possible Complications

    Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like:

    • Bleeding
    • Pain or bruising at the needle insertion site
    • Infection at the needs insertion site