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Electromyography (EMG) - Nerve Test

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  • Introduction
  • Diagnosis

Introduction

Electromyography (EMG) is an electrodiagnostic test that measures the nerve impulses in muscles during contraction.  Nerves throughout the body exchange information with the brain through nerve impulses. Healthy muscles need nerve input to perform movements.  Doctors use EMG to identify muscle function as related to nerve input. EMGs help doctors diagnose neuromuscular disease, neurological disorders, muscle disease, and nerve abnormalities associated with pain or numbness.  

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Diagnosis

EMGs are usually outpatient electrodiagnostic procedures.  EMGs can take place at a doctor's office or in a hospital.  The nerve test typically lasts 30 to 60 minutes.
 
To begin, your doctor will place fine needle electrodes through the skin and into the muscles that a nerve controls.  The electrodes transmit information about the nerve/muscle electrical activity.  A computer records nerve impulses while the muscle is at rest and during muscle movement. 
 
The examiner may reposition the electrodes throughout the test. More than one muscle is typically tested.  Your doctor will share the results with you.
 
An EMG may be uncomfortable during the test.  Your muscles may remain a bit sore following the procedure. 
 
It is common for an EMG and another type of nerve test, nerve conduction velocity (NCV), to take place at the same time. The NVC usually precedes the EMG.
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This information is intended for educational and informational purposes only. It should not be used in place of an individual consultation or examination or replace the advice of your health care professional and should not be relied upon to determine diagnosis or course of treatment.

The iHealthSpot patient education library was written collaboratively by the iHealthSpot editorial team which includes Senior Medical Authors Dr. Mary Car-Blanchard, OTD/OTR/L and Valerie K. Clark, and the following editorial advisors: Steve Meadows, MD, Ernie F. Soto, DDS, Ronald J. Glatzer, MD, Jonathan Rosenberg, MD, Christopher M. Nolte, MD, David Applebaum, MD, Jonathan M. Tarrash, MD, and Paula Soto, RN/BSN. This content complies with the HONcode standard for trustworthy health information. The library commenced development on September 1, 2005 with the latest update/addition on April 13th, 2016. For information on iHealthSpot’s other services including medical website design, visit www.iHealthSpot.com.

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  • Meet the Doctors
    • Raymond Candage, MD
    • Steven Coss, MD
    • Jeffrey Dulik, DO
    • Ericka Glass, MD
    • Michael Lykins, DO
    • Dean Marshall, DO
    • Ajay K. Seth, MD
    • Mark J. Shepard, MD
    • Jared J. Stefanko, DO, MS
    • Ryan L. Eschbaugh, DO
    • Jana Glick
    • Katy Kerkian-Winton
    • Marcia Grossman
    • Patrick Robbins
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  • Conditions We Treat
    • Sports Medicine Injuries
    • Sprains
    • Ligament Disruptions
    • Cartilage Tears
    • Repetitive Stress Disorders
    • Overuse Syndromes
    • Tendonitis
    • Arthritis and Bursitis
    • Fractures and Dislocations
    • Work-Related Injuries
    • Neck and Back Injuries
    • Foot and Ankle Injuries
    • Shoulder and Elbow Injuries
    • Hand and Wrist Injuries
    • Hip and Knee Injuries
    • Back
  • Orthopaedic Surgery
    • Arthroscopy
    • Total Joint Replacement
    • Fractures & Dislocations
    • Shoulder Surgery
    • Foot Surgery
    • Hand Surgery
    • Spine Surgery
    • Robotic Surgery
    • Outpatient Total Joint Replacement Surgery
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