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Amplitude of Nerve Conduction Velocity (NCV) Measurement

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

This test measures how fast electrical signals travel along your nerves, often used to diagnose nerve damage or conditions like neuropathy.

Quick summary

["Assessing nerve function to detect or monitor nerve-related issues."]

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

Key facts at a glance

LOINC
98698-4
Short code
SNAP amplitude Nerve
Synonyms
SNAP amplitude 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 This Test Measures

Nerve conduction velocity (NCV) tests evaluate how quickly electrical impulses travel through nerves. Your doctor may use this test to check for conditions like peripheral neuropathy, nerve compression (e.g., carpal tunnel), or other nerve disorders. The test involves placing electrodes on your skin to stimulate nerves and measure the response time.

How the Test Works

During an NCV test, electrodes are attached to your skin at specific points. A mild electrical stimulus is applied to one nerve, and the speed at which the signal travels is recorded. Multiple nerves may be tested to compare results.

Common Uses

Doctors often use NCV tests to diagnose or monitor nerve-related conditions, such as: - Peripheral neuropathy (nerve damage from conditions like diabetes) - Carpal tunnel syndrome (nerve compression in the wrist) - Guillain-Barré syndrome (a rare autoimmune nerve disorder) - Other nerve disorders or injuries.

Preparation

No special preparation is usually needed, but you may be asked to avoid certain medications or activities that could interfere with results. Wear loose clothing and avoid applying lotions or oils to the areas where electrodes will be placed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend an NCV test if you have symptoms like numbness, tingling, weakness, or pain in your hands or feet. It helps identify nerve damage or dysfunction that other tests might not catch.
How long does the test take?
The test typically takes about 30 to 60 minutes, depending on how many nerves are tested. You may need to sit still while electrodes are placed and signals are recorded.
Is the test painful?
The electrical stimulation used in the test is mild and usually not painful. You may feel a slight tingling or muscle twitching, but it shouldn’t cause discomfort.
  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