- Nerve Conduction Velocity Test (NCV) Center
- Dementia Slideshow Pictures
- Take the ADHD Quiz
- Brain Foods Slideshow
- Patient Comments: Nerve Conduction Velocity Test - Experience
What is a nerve conduction velocity test (NCV)?
A nerve conduction velocity test (NCV) is an electrical test that is used to determine the adequacy of the conduction of the nerve impulse as it courses down a nerve. This test is used to detect signs of nerve injury.
In this test, the nerve is electrically stimulated, and the electrical impulse 'down stream' from the stimulus is measured. This is usually done with surface patch electrodes (they are similar to those used for an electrocardiogram) that are placed on the skin over the nerve at various locations. One electrode stimulates the nerve with a very mild electrical impulse. The resulting electrical activity is recorded by the other electrodes. The distance between electrodes and the time it takes for electrical impulses to travel between electrodes are used to calculate the speed of impulse transmission (nerve conduction velocity). A decreased speed of transmission indicates nerve disease or abnormal pressure on the nerve. A nerve conduction velocity test is often done at the same time as an electromyogram (EMG). An EMG is carried out in order to exclude or detect muscle conditions which may be present due to muscular or neurologic disease.
Why the nerve conduction velocity test is performed
Symptoms that might prompt a health care professional to order a nerve conduction velocity test test include numbness, tingling, and/or burning sensations. The nerve conduction velocity test test can be used to detect true nerve disorders (such as peripheral neuropathy and mononeuritis multiplex) or conditions whereby nerves are affected by mechanical compression injury (such as carpal tunnel syndrome and other compression neuropathies). A normal body temperature must be maintained for the nerve conduction velocity test, because low body temperatures slow the speed of nerve conduction.
Quick GuideConcussions & Brain Injuries: Symptoms, Tests, Treatment
Daily Health News
Subscribe to MedicineNet's General Health Newsletter
Horowitz, Steven H. "Overview of nerve conduction studies." UptoDate. Updated Feb. 19, 2014.
Top Nerve Conduction Velocity Test Related Articles
Arsenic PoisoningArsenic comes in two forms, inorganic and organic. Organic arsenic poisoning is usually not poisonous to humans; however, inorganic arsenic in large enough amounts can lead to shock and death. Symptoms of arsenic poisoning include:
- abdominal pain,
- dark urine,
- shock, and
Carpal Tunnel SyndromeCarpal tunnel syndrome is a condition in which irritation of the wrist's median nerve causes tingling and numbness of the thumb, index, and the middle fingers. Treatment of carpal tunnel syndrome depends on the severity of the symptoms and the nature of any disease that might be causing the symptoms.
Carpal Tunnel SyndromeA type of compression neuropathy (nerve damage) caused by compression and irritation of the median nerve in the wrist. See a picture of Carpal Tunnel Syndrome and learn more about the health topic.
Carpal Tunnel QuizWho is more affected by carpal tunnel syndrome: Men or women? Take the Carpal Tunnel Quiz to learn the causes, symptoms, and treatments for this common hand condition.
Degenerative DiscDegenerative disc disease makes the disc more susceptible to herniation (rupture) which can lead to localized or radiating pain. The pain from degenerative disc or joint disease of the spine is usually treated conservatively with intermittent heat, rest, rehabilitative exercises and medications to relieve pain, muscle spasm and inflammation.
Diabetic neuropathy a condition in which nerve damage has occurred as a complication of diabetes. The pain from the nerve damage can be severe with tingling or numbness in the part of the body affected. Diabetic neuropathy can occur anywhere in the body. Diabetic neuropathy can cause symptoms like intense pain, numbness, burning, or tingling in the part of the body affected by the condition.
There are four types of neuropathy include peripheral, autonomic, proximal and focal. Natural therapies and medications may help relieve the pain and other symptoms of diabetic neuropathy.
ElectromyogramElectromyogram or EMG is defined as a test that records the electrical activity of muscles. Normal muscles produce a typical pattern of electrical current that is usually proportional to the level of muscle activity. Diseases of muscle and/or nerves can produce abnormal electormyogram patterns.
Low Back PainThere are many causes of back pain. Pain in the low back can relate to the bony lumbar spine, discs between the vertebrae, ligaments around the spine and discs, spinal cord and nerves, muscles of the low back, internal organs of the pelvis and abdomen, and the skin covering the lumbar area.
Neck PainNeck pain (cervical pain) may be caused by any number of disorders and diseases. Tenderness is another symptom of neck pain. Though treatment for neck pain really depends upon the cause, treatment typically may involve heat/ice application, traction, physical therapy, cortisone injection, topical anesthetic creams, and muscle relaxants.
Peripheral NeuropathyPeripheral neuropathy is a problem with the functioning of the nerves outside of the spinal cord. Symptoms may include numbness, weakness, burning pain (especially at night), and loss of reflexes. Possible causes may include carpel tunnel syndrome, meralgia paresthetica, vitamin or nutritional deficiencies, and illnesses like diabetes, syphilis, AIDS, and kidney failure. Most causes of peripheral neuropathy can be successfully treated or prevented.
Pinched Nerve OverviewA pinched nerve causes pain, numbness, or tingling in the affected area due to pressure on a nerve. Caral tunnel and sciatica are two examples of conditions caused by a pinched nerve. A pinched nerve is diagnosed by taking a patient history and performing a physical examination. Electromyography may be performed. Treatment for a pinched nerve depends on the underlying cause.
RadiculopathyRadiculopathy, a condition in which a nerve or nerves along the spine are compressed causing pain, numbness, weakenss, and tingling along the nerve(s). Some causes of radiculopathy include
- bone spurs,
- disc hernation,
- and neuropathy.
- cervical radiculopathy,
- lumbar radiculopathy,
- and thoracic radiculopathy.