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Motor nerve conduction velocity (left tibial nerve)

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

This test measures how quickly electrical signals travel along the left tibial nerve, which helps assess nerve function in your lower leg.

Quick summary

["It helps diagnose nerve damage or disorders affecting leg nerves."]

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

Key facts at a glance

LOINC
98692-7
Short code
Motor NC velocity L tibial n
Synonyms
Motor NC velocity L tibial 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 numbness, tingling, weakness, or pain in your left leg or foot. It can also help evaluate conditions such as peripheral neuropathy, nerve compression, or other neurological issues.

What to Expect During the Test

You’ll lie on your back with your left leg slightly bent. A small needle electrode will be placed on your left ankle and another on your thigh. A mild electric shock will be sent through the electrode to measure how fast the signal travels from your ankle to your thigh.

Preparation and Care

No special preparation is needed. Wear loose clothing and avoid using lotions or oils on your skin where electrodes will be placed. You may feel a slight tingling or mild discomfort during the test.

What the Results Mean

Results show the speed of nerve signal travel. Slower speeds may indicate nerve damage or disease. Your doctor will compare these results with your symptoms and other tests to diagnose the underlying issue.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test plays a key role in diagnosing and monitoring conditions affecting nerve function, such as diabetic neuropathy, Guillain-Barré syndrome, or other peripheral neuropathies. It helps guide treatment decisions and assess disease progression.

Short name

Left Tibial Nerve Conduction Velocity

Frequently asked questions

What does a low or high nerve conduction velocity mean?
A slower-than-normal conduction velocity may suggest nerve damage, inflammation, or compression. A faster-than-normal velocity is less common but could indicate certain nerve disorders or technical factors in testing.
How often will I need this test?
Your doctor will determine how often you need this test based on your symptoms, diagnosis, and treatment plan. Some patients may need it once, while others may require follow-up tests over time.
Can I eat or drink before this test?
You can eat and drink normally before the test, as it does not require fasting. Avoid applying lotions or creams to the skin where electrodes will be placed to ensure accurate results.
  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