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Nerve Conduction Velocity (NCV) Testing

Published: August 9, 2026Updated: August 16, 2026

This test measures how quickly electrical signals travel along your nerves, helping diagnose nerve damage or conditions like neuropathy.

Quick summary

["NCV helps identify nerve function and potential issues causing pain, tingling, or weakness."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
98700-8
Short code
Sensory NC velocity Nerve
Synonyms
Sensory NC velocity Nerve
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
nerve-conduction
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Is Nerve Conduction Velocity Testing?

Nerve conduction velocity (NCV) testing involves placing small electrodes on your skin to stimulate nerves at different points. A device records the electrical signals as they travel through your nerves. This process measures how fast these signals move, which reflects nerve health and function.

Why Might You Need This Test?

Your doctor may recommend NCV testing if you have symptoms like numbness, tingling, weakness, or pain that might suggest nerve damage. It’s also used to monitor conditions like diabetes, nerve injuries, or hereditary nerve disorders.

How Is the Test Performed?

The test is usually quick and painless. You’ll lie down while electrodes are attached to your skin. A mild electrical pulse is sent through your nerves, and the results are recorded to assess signal speed and integrity.

What Are Common Conditions Evaluated?

NCV testing helps diagnose or monitor conditions such as carpal tunnel syndrome, peripheral neuropathy, Guillain-Barré syndrome, or other nerve-related disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

NCV

Frequently asked questions

How long does the test take?
The test typically takes about 30 to 60 minutes, depending on the number of nerves being tested and your body’s response to stimulation.
Is the test painful?
No, the test is generally not painful. You may feel a mild tingling or slight discomfort from the electrical stimulation, but it’s usually brief and well-tolerated.
Can I eat or drink before the test?
You can eat and drink normally before the test, as it doesn’t require fasting. However, avoid applying lotions or oils to the skin where electrodes will be placed, as they may interfere with the test.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy