Skip to content

Neurofilament Light Chain in Cerebrospinal Fluid (CSF)

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

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

Quick summary

["NfL CSF helps detect nerve injury or neurodegenerative conditions by measuring a protein released into the CSF."]

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

Key facts at a glance

LOINC
101451-3
Short code
Neurochondrin Ab CSF Ql IF
Synonyms
Neurochondrin Ab CSF Ql IF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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, numbness, or balance issues that could suggest nerve damage. It’s often used alongside other tests to diagnose conditions like multiple sclerosis, traumatic brain injury, or other neurological disorders.

What Does the Test Involve?

A small amount of cerebrospinal fluid (CSF) is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then analyzed in a lab to measure the protein levels.

What Are Common Uses?

This test is particularly useful for monitoring nerve health in conditions where nerve fibers may be damaged or degraded, such as in progressive neurological diseases or after trauma.

What Might Abnormal Results Indicate?

Elevated levels of neurofilament light chain in CSF may suggest nerve damage or disease, such as neurodegenerative disorders, traumatic brain injury, or certain inflammatory conditions of the nervous system.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

NfL CSF

Frequently asked questions

What does a high or low NfL CSF result mean?
A high level of NfL in CSF may indicate nerve damage or disease, but results should be interpreted by your healthcare provider in the context of your symptoms and other tests. Low levels alone are not typically concerning unless part of a broader evaluation.
How is this test different from blood tests for nerve function?
This test specifically measures NfL in CSF, which reflects nerve cell damage in the central nervous system (brain and spinal cord). Blood tests may assess general nerve function or other markers but do not provide the same detailed CSF-based insight.
Is this test painful?
The lumbar puncture procedure involves a small needle inserted into the lower back, which can cause temporary discomfort. Most patients describe it as similar to a mild pinch, but pain is usually managed with medication afterward.
  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