Motor Neuron Function Velocity (Median Latency)
This test measures the speed at which electrical signals travel along motor nerves, specifically focusing on the median nerve. It helps assess nerve function and identify potential issues with nerve conduction.
["This test helps diagnose and monitor conditions affecting nerve function, such as peripheral neuropathy or other neuromuscular disorders."]
Key facts at a glance
- LOINC
- 98675-2
- Short code
- Motor NC velocity R median n
- Synonyms
- Motor NC velocity R 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
Why Is This Test Done?
Your healthcare provider may order this test if you have symptoms like muscle weakness, tingling, or numbness that could indicate nerve damage. It’s also used to evaluate conditions like multiple sclerosis, diabetic neuropathy, or other nerve-related disorders.
What Does the Test Involve?
You’ll have small electrodes placed on your skin near your hand and forearm. A mild electric shock is applied to stimulate the median nerve, and the time it takes for the signal to reach your muscle is recorded. This process is usually painless and quick.
Preparation and Procedure Details
No special preparation is needed, but you may be asked to avoid certain medications that could affect nerve function. The test typically takes about 30 minutes and is done in a clinical setting with a trained technician.
What Are Common Conditions This Test Helps Diagnose?
This test can help identify issues like carpal tunnel syndrome, peripheral neuropathy, Guillain-Barré syndrome, or other nerve disorders that may cause slowed or delayed nerve signals.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Motor nerve conduction velocity tests are critical for diagnosing and managing conditions that disrupt nerve signaling. Abnormal results may indicate nerve damage, inflammation, or structural problems in the peripheral nervous system, guiding treatment decisions and monitoring disease progression.
Short name
Motor Nerve Conduction Velocity Median Latency
Frequently asked questions
How painful is this test?
Will I need to fast before this test?
What should I wear for this 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