Book an Appointment
Emergency: 022-61305005
I want to find
My Health Records
Management Team

Electromyography (EMG)

Overview

Electromyography (EMG) is the other component of NCV, which is used to measure the electrical activity of muscles and the nerves controlling them.

It helps doctors understand whether muscle weakness or movement problems are due to issues in the muscle itself, the nerve supplying the muscle, the spinal cord, or the connection between the nerve and muscle (neuromuscular junction).

EMG is useful in diagnosing or evaluating:

  • Diagnosis of muscle dystrophy and other muscle diseases
  • Evaluation of muscle weakness or paralysis
  • Single fibre EMG for neuromuscular diseases
  • Evaluation of peripheral neuropathy, radiculopathy, nerve compression, or entrapment
  • Establishing diagnosis of anterior horn cell disorders (e.g., motor neuron diseases such as ALS)
  • Evaluation of cramps, spasms, or tremors

The following steps are involved:

  • A thin needle electrode is gently inserted in the muscles.
  • The muscle’s electrical activity is recorded at rest and during contraction.
  • Sometimes, a single fibre EMG may be done for very detailed study of neuromuscular disorders.

The test usually takes 30 to 60 minutes, depending on how many muscles and nerves need to be studied.

  • You may feel slight soreness in the muscles tested, which usually goes away within a day or two.
  • Apply a warm compress to ease discomfort if needed.
  • You can resume normal activities immediately unless advised otherwise.

Disclaimer:

The information in this Health Library is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional with any questions about a medical condition or before starting any treatment. Use of this site and its content does not establish a doctor–patient relationship. In case of a medical emergency, call your local emergency number or visit the nearest emergency facility immediately.