Nerve Conduction Velocity Test
Health Checkups
≈ ¥200-400
(≈ $30-60)
30 min
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Description
Estimated cost for Nerve Conduction Velocity Test at general public hospitals in China is about ¥140-320, and at Grade 3A hospitals about ¥200-400, varying by hospital tier and region.
Main Uses
Nerve conduction velocity (NCV) tests are primarily used to diagnose and evaluate the extent of nerve damage or dysfunction. They are applicable in scenarios such as diagnosing carpal tunnel syndrome, assessing the severity of peripheral neuropathies, evaluating the effectiveness of treatments for nerve-related conditions, and differentiating between nerve and muscle disorders.
Normal Range
The normal range for nerve conduction velocity (NCV) varies depending on the specific nerve being tested, but generally, it falls between 50-60 meters per second for upper limb nerves and 40-50 meters per second for lower limb nerves. Latency (the time it takes for a signal to travel from the stimulation site to the recording site) should be within 2-3 milliseconds for sensory nerves and 4-5 milliseconds for motor nerves.
Low Values - Possible Causes
Possible causes of low NCV values include: peripheral neuropathy, demyelinating diseases such as multiple sclerosis, Guillain-Barré syndrome, chronic inflammatory demyelinating polyneuropathy (CIDP), and physical injuries or compression of the nerves.
High Values - Possible Causes
High NCV values are less common and usually indicate technical errors in testing. However, in some rare cases, high values might be observed in conditions like hyperthyroidism, where metabolic rates are increased, or in early stages of certain neuropathies before significant damage occurs.