CaRi-heart technology
Revolutionary new technology to assess the risk of a serious heart condition or heart attack – many years before anything happens.
Neurophysiology
Electromyogram (EMG)
Find out how EMG can be used to test the function of your peripheral muscles by monitoring their electrical activity.
Our EMG locations
Devonshire Diagnostic Centre
13-19 Devonshire Street Marylebone W1G 7AF London
Chelsea Outpatients
280 King's Road SW3 5AW London
Chiswick Outpatients
Bond House 347-353 Chiswick High Road W4 4HS London
London Bridge Hospital
27 Tooley Street SE1 2PR London
The Christie Private Care
Wilmslow Road M20 4BX Manchester
The Harley Street Clinic
35 Weymouth Street W1G 8BJ London
The Lister Hospital
Chelsea Bridge Road SW1W 8RH London
The Princess Grace Hospital
42-52 Nottingham Place W1U 5NY London
The Shard Outpatients
The Shard 32 St Thomas Street SE1 9BS London
The Wellington Hospital
8A Wellington Place St John's Wood NW8 9LE London
The Wellington Hospital Outpatients
15 - 17 Lodge Road NW8 7JA London
The Wilmslow Hospital
52-54 Alderley Road Wilmslow SK9 1NY Cheshire
What is an EMG test?
Electromyography (EMG) is a neurophysiology test used to measure and record electrical activity in the muscle when both relaxed and contracted. It can be used to detect symptoms of the following:
- carpal tunnel syndrome
- ulnar neuropathy
- nerve injuries
- peripheral neuropathy
- Guillain-Barre syndrome
- evidence of nerve root lesions (cervical and lumbar radiculopathy)
- muscle disorders
Need to know
You will be asked to lie down or sit on a chair, depending on the area being tested. A thin, one-use electrode needle is inserted into the muscle. The needle contains a wire that is attached to a measuring monitor. You'll be asked to tighten then relax the muscle. The electrical activity is recorded on the monitor.
The electrode may be moved several times to ensure the activity is accurately recorded. The test lasts for about an hour and you may feel a repetitive tapping or tingling sensation. When the test is done, any electrodes are removed and the area will be cleaned.
For the test you should remove any jewellery, as this will make it easier to attach the electrodes. You should also wear a top with short sleeves and a skirt or loose trousers. Avoid using any skin creams before the test.
You may eat and drink normally beforehand, and it might also be helpful to bring a list of your current medications with you.
The area where the needle is inserted may be a little sore. You may feel a numbness or slight tingling in your muscles for one to two hours after the test. If swelling persists, or there's an increase in pain, you should contact your consultant.