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Nerve Conduction Velocity (NCV) with Motor and Sensory Evaluation

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

This test measures how quickly electrical signals travel along your nerves, helping diagnose conditions like nerve damage, neuropathy, or muscle disorders.

Quick summary

["Assesses nerve and muscle function to identify potential nerve or muscle-related issues."]

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

Key facts at a glance

LOINC
98640-6
Short code
Sensory NC velocity L MACN
Synonyms
Sensory NC velocity L MACN
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 Measured?

Your doctor may evaluate both sensory and motor nerve function. Sensory NCV tests how well you feel touch, temperature, or pain, while motor NCV measures how quickly signals reach your muscles to cause movement.

Why Is This Test Done?

This test is often used to diagnose or monitor conditions such as peripheral neuropathy, carpal tunnel syndrome, Guillain-Barré syndrome, or other nerve or muscle disorders. It may also help assess nerve damage from conditions like diabetes or injuries.

How Is the Test Performed?

You’ll lie on an exam table while electrodes are placed on your skin at various points along your arms, legs, or other body parts. A mild electrical stimulus is applied to stimulate nerves, and the speed of the signal is recorded and measured.

What Are Common Findings?

Slow nerve conduction times may indicate nerve damage or disease. Abnormal responses could suggest conditions affecting nerve function, such as inflammation, compression, or degeneration.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

NCV/Sensory/Motor

Frequently asked questions

How long does the test take?
The test usually takes about 30 to 60 minutes, depending on the areas being tested and any additional evaluations needed.
Is the test painful?
You may feel a mild tingling or slight discomfort when the electrical stimulus is applied, but it is generally not painful. You can communicate if the sensation is too intense.
Can I eat or drink before the test?
You can eat and drink normally before the test, as it does not require fasting. However, avoid caffeine or nicotine for at least 2 hours before testing, as they can affect nerve responses.
  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