Nerve Conduction Studies (NCS)

Nerve conduction studies (NCS) are tests that measure how quickly and effectively nerves send electrical signals. These signals help control movement and sensation. NCS is often done when a child has numbness, tingling, or muscle weakness. The test helps detect nerve damage or dysfunction and is commonly performed along with electromyography (EMG) for a more complete assessment of the nervous system.

Reasons for Testing

An NCS may be ordered if your child has:

Numbness or tingling
Weakness in the arms or legs
Chronic pain or burning sensations
Suspected nerve compression or injury

It can help diagnose:

Carpal tunnel syndrome or other nerve entrapments
Peripheral neuropathy
Nerve damage from injury
Guillain-Barré syndrome
Inherited nerve disorders like Charcot-Marie-Tooth (CMT)

What to Expect

Small electrode patches are placed on the skin over nerves. A mild electrical impulse is applied to stimulate the nerve, and the response is measured. This test helps determine the speed and strength of nerve signals. The stimulation may feel like a quick tap or mild shock. It may be uncomfortable but is not harmful. The entire test usually takes 20–60 minutes.

After the Test

There is no special care needed after an NCS. Your child can return to normal activities right away.

Risks and Complications

NCS is very safe. Side effects are rare but may include:

Temporary discomfort from the electrical stimulation

NCS can provide valuable information to help guide treatment. Early detection of nerve problems allows for better management and recovery. It can be used to guide future management including surgery.

When to Call the Provider

Call your child’s provider if:

There should be no lasting effects after the test.

Key Points

NCS evaluates how well nerves send signals to the muscles.
It is helpful for diagnosing nerve injuries or disorders.
The test is quick, safe, and minimally uncomfortable.
Results help determine the best course of treatment for your child.