Motor Neuron Conduction Velocity (Nerve)
This test measures how quickly electrical signals travel along your motor nerves, which control voluntary muscle movement. It helps diagnose and monitor conditions affecting nerve function.
["This test assesses nerve speed to identify potential nerve damage or disorders."]
Key facts at a glance
- LOINC
- 98731-3
- Short code
- Motor NC velocity Nerve
- Synonyms
- Motor 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 a Motor Nerve Conduction Velocity Test?
A motor nerve conduction velocity (NCV) test involves attaching electrodes to your skin at different points along a muscle nerve. A mild electric stimulus is applied to send a signal through the nerve, and the speed at which the signal travels is recorded. This test can be done on one or both legs or arms, depending on your symptoms or medical needs.
Why Might You Need This Test?
Your doctor may recommend this test if you have symptoms like muscle weakness, numbness, tingling, or muscle twitching that could suggest nerve damage. Conditions like peripheral neuropathy, multiple sclerosis, or Guillain-Barré syndrome may require this evaluation.
How Is the Test Performed?
The test is usually quick and painless. You’ll lie down while electrodes are placed on your skin. A small electric shock is delivered to stimulate the nerve, and the speed of the signal is measured. The procedure typically takes 30 to 60 minutes.
What Do the Results Mean?
Results show the speed of nerve signal travel. Abnormally slow speeds may indicate nerve damage or disease, while normal speeds help confirm healthy nerve function. Your doctor will interpret results in relation to your symptoms and medical history.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Slow nerve conduction velocities can signal conditions like chronic nerve compression (e.g., carpal tunnel syndrome), polyneuropathy, or demyelinating diseases. Fast or irregular velocities may suggest nerve damage from trauma, toxins, or metabolic disorders. This test is critical for diagnosing and guiding treatment for nerve-related conditions.
Short name
Nerve Conduction Velocity (Motor)
Frequently asked questions
How often will I need this test?
What preparation is needed before the test?
Will the test hurt?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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