Electromyogram (EMG)

An electromyography (EMG) is a technique used to evaluate the function of nerves and muscles by recording the electrical activity of skeletal muscles. It is an important test to diagnose neuromuscular disorders and is often used to evaluate disorders of the peripheral nervous system.

EMG involves the insertion of a pin electrode (tiny needle) through the skin into the muscle tissue. The electrical activity of the muscle is then recorded on a computer to allow neurologist to diagnose any abnormal muscle or nerve activity. This test helps to differentiate between nerve root and muscle disease.

An EMG is commonly performed if an examination suggests impaired muscle strength. Results of an EMG allow the doctor to determine if the muscle weakness is caused by an injury of a nerve attached to the muscle or an underlying neurological disorder.

Doctor will request for an EMG testing to be done if the diagnosis suggests peripheral nervous system disorders including carpal tunnel syndrome, peripheral neuropathy, diabetic neuropathy, cervical radiculopathy, lumbosacral radiculopathy, sciatica, plexopathy, or nerve injury from trauma or fractures.