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Cerebrospinal Fluid Neurofilament Light Chain (NfL) Measurement

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

This test measures a protein found in nerve fibers, which can help assess nerve damage or disease in the brain and spinal cord.

Quick summary

["NfL levels in CSF may indicate neurological conditions requiring further evaluation."]

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

Key facts at a glance

LOINC
109775-7
Short code
Neurochondrin Ab Msmt CSF
Synonyms
Neurochondrin Ab Msmt CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test if you have symptoms like memory loss, weakness, vision changes, or other signs of potential nerve or brain damage. It can help diagnose conditions such as multiple sclerosis, traumatic brain injury, or neurodegenerative diseases.

What Does the Specimen Look Like?

A small amount of fluid is collected from your spinal column through a procedure called a lumbar puncture (spinal tap). The fluid is then sent to the lab for testing.

How Is the Test Performed?

The lab uses specialized techniques to measure the protein levels in the cerebrospinal fluid. Results are compared to what is typically found in healthy individuals to identify any abnormalities.

What Are Possible Results?

Results are not provided with specific reference ranges. Instead, they are interpreted in the context of your symptoms, medical history, and other test results by your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Neurofilament Light Chain (NfL) in CSF is a biomarker associated with axonal injury or degeneration. Elevated levels may suggest conditions affecting nerve fibers, such as traumatic brain injury, neurodegenerative diseases (e.g., amyotrophic lateral sclerosis, Alzheimer’s), or inflammatory neurological disorders (e.g., multiple sclerosis). However, interpretation depends on clinical context and other diagnostic findings.

Short name

NfL CSF

Frequently asked questions

What does an elevated NfL CSF level mean?
An elevated NfL level may indicate nerve damage or disease, but it is not a standalone diagnosis. Your doctor will consider your symptoms, medical history, and other tests to determine the cause.
How long does it take to get results?
Results are typically available within 2–5 business days, depending on lab processing times and your healthcare provider’s workflow.
Can lifestyle changes affect NfL levels?
NfL levels are primarily influenced by nerve injury or disease. While lifestyle factors like diet and exercise can support overall health, they do not directly alter NfL measurements in this test.
  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