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Median Sensory Nerve Conduction Velocity (MSNCV)

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

This test measures how quickly electrical signals travel along sensory nerves in your arms or legs. It helps diagnose nerve damage or conditions affecting nerve function.

Quick summary

["Assesses nerve conduction speed to check for potential nerve disorders."]

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

Key facts at a glance

LOINC
98620-8
Short code
Sensory NC velocity L median n
Synonyms
Sensory 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

Why Is This Test Done?

Your doctor may order this test if you have symptoms like tingling, numbness, weakness, or pain in your limbs. It can also help diagnose conditions like neuropathy, multiple sclerosis, or other nerve-related disorders.

What to Expect During the Test

You’ll lie down while electrodes are placed on your skin at different points along your arm or leg. A mild electrical stimulus is applied to measure how fast signals travel between electrodes. The process is quick and painless.

Preparation Tips

No special preparation is needed, but wear loose clothing and avoid using lotions or creams on the areas where electrodes will be placed.

What the Results Mean

Results compare your nerve conduction speed to typical values. Slower speeds may indicate nerve damage or disease, while normal speeds suggest healthy nerve function.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is crucial for diagnosing and monitoring conditions that affect nerve function, such as peripheral neuropathy, diabetic neuropathy, or other neurological disorders. It helps guide treatment plans and track disease progression.

Short name

Sensory Nerve Speed Test

Frequently asked questions

How long does the test take?
The test usually takes about 30 to 60 minutes, depending on the number of nerves being tested.
Will the test hurt?
You may feel a slight tingling or mild discomfort from the electrical stimulation, but it shouldn’t be painful.
Can I eat or drink before the test?
Yes, you can eat and drink normally before the test, as no special diet or fasting is required.
  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