Motor Neuron Cell Velocity Median (Median Motor Nerve Conduction Velocity)
This test measures the speed at which electrical signals travel along the median nerve, which controls muscles in your forearm and hand. It helps assess nerve function and identify issues like neuropathy or nerve compression.
["This test evaluates median nerve conduction speed to detect nerve-related problems."]
Key facts at a glance
- LOINC
- 98672-9
- Short code
- Motor NC velocity L median n
- Synonyms
- Motor NC velocity L median n
- 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 the Median Motor Nerve Conduction Velocity Test Used For?
Doctors use this test primarily to diagnose and monitor conditions affecting nerve function, such as carpal tunnel syndrome, peripheral neuropathy, or other nerve disorders. It helps determine if there’s delayed nerve signal transmission, which may indicate damage or compression.
How Is the Test Performed?
The test involves placing small electrodes on your skin near the median nerve pathways in your arm. A mild electrical stimulus is passed through these electrodes to measure how quickly the signal travels from one point to another. The process is usually quick and painless, though you may feel a slight tingling or mild discomfort.
What Does a Low or High Velocity Indicate?
A slower-than-normal median nerve conduction velocity may suggest nerve damage, inflammation, or compression (e.g., carpal tunnel syndrome). A significantly faster velocity is less common but could indicate demyelination or other nerve abnormalities. Your doctor will interpret results in the context of your symptoms and medical history.
How Often Is This Test Done?
This test is typically performed as part of a diagnostic evaluation for nerve-related symptoms, such as tingling, weakness, or pain in your hand or forearm. It may also be repeated over time to monitor progression or treatment response in chronic conditions.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test plays a key role in diagnosing conditions like peripheral neuropathy, nerve entrapment (e.g., carpal tunnel syndrome), or other nerve disorders. By measuring conduction velocity, doctors can assess nerve integrity, identify areas of delayed or blocked signals, and guide treatment decisions, such as physical therapy, medication, or surgical intervention if needed.
Short name
Median Motor Nerve Conduction Velocity
Frequently asked questions
How long does the test take?
Is the test painful?
Can I eat or drink before the test?
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