What Is Neurofilament Light Chain (NfL)?
Neurofilament Light Chain, or NfL, is a structural protein found in nerve cells. When axons are injured, NfL can enter cerebrospinal fluid and blood. A blood test can measure its concentration as one objective biomarker data point, but it cannot identify a cause or diagnose a specific neurological condition.
Insight, not a diagnosis. NfL is not specific to one condition.
- Private self-pay testing
- Labcorp blood draw
- Upfront $350 pricing
- No insurance billing by LabTestsOnDemand
- Secure results delivery
What Neurofilament Light Chain Measures
Neurofilament Light Chain, often called NfL, is a protein that can be released into the blood when nerve cells are injured or damaged. Measuring NfL may provide useful information about brain and nervous system health when reviewed in the right clinical context.
Important note: NfL is not specific to one condition. A result should not be used by itself to diagnose Alzheimer’s disease, ALS, MS, Parkinson’s disease, dementia, traumatic brain injury, concussion, or any other condition.
What This Test Can and Cannot Tell You
This test can help measure:
- Neurofilament Light Chain in blood
- A biomarker associated with nerve cell injury
- A data point to discuss with a qualified healthcare provider
- Brain and nerve health insight in clinical context
This test does not:
- Diagnose any disease or injury
- Detect Alzheimer’s, ALS, MS, Parkinson’s, dementia, concussion, or traumatic brain injury
- Prove brain damage
- Guarantee early detection
- Rule out neurological disease
- Replace medical care, diagnosis, or treatment
Why People Research NfL Blood Testing
People may research NfL testing for many reasons, including general brain and nerve health education, questions after a head injury or repeated impacts, interest in neurological biomarkers, or wanting more information before or alongside a provider conversation.
This page is educational. Some people simply want to understand what a biomarker like NfL measures before discussing testing options with a qualified healthcare provider.
Read the NfL results and reference-range guideA Private Self-Pay Path Through LabTestsOnDemand
LabTestsOnDemand offers a private self-pay path for ordering the Neurofilament Light Chain Blood Test online. The blood draw is completed at Labcorp. This is not an at-home kit. LabTestsOnDemand does not bill insurance for this order.
If you are comparing price and access, review the complete $350 NfL blood test and Labcorp ordering details.
- Online order
- Upfront $350 pricing
- Labcorp blood draw
- No insurance billing by LabTestsOnDemand
- Secure results
- Review results with a qualified provider
From Online Order to Labcorp Blood Draw
- 1
Order online
Choose the Neurofilament Light Chain (NfL) Blood Test and complete private checkout.
- 2
Receive instructions
LabTestsOnDemand prepares the order and emails your instructions and paperwork.
- 3
Visit Labcorp
Follow the emailed instructions and complete your blood draw at Labcorp. Do not go to Labcorp before receiving and reviewing your instructions.
- 4
Receive secure results
Results are delivered securely once available.
- 5
Review with a provider
Review your result alongside symptoms, medical history, and other clinical information with a qualified healthcare provider.
Designed to Make Private Lab Testing Simple
LabTestsOnDemand is built for people who want a clear, private, upfront-priced way to access lab testing without insurance billing confusion. The process is designed to be simple: order online, receive instructions, complete your Labcorp blood draw, and receive secure results.
- Private and discreet
- Upfront pricing
- Labcorp blood draw
- No surprise lab bill for this order
- Not an at-home kit
- Clear next steps
Frequently Asked Questions
Authoritative Sources
Source 1
Neurofilaments as biomarkers in neurological disorders—towards clinical applicationNature Reviews Neurology, 2024
Supports: NfL biology, measurement in blood, broad neurological research, and factors that affect interpretation.
Source 2
Neurofilament Light Chain Fact SheetCleveland Clinic
Supports: Neurofilament structure, release into body fluids, serum/plasma measurement, and assay differences.
Source 3
Neurofilament Light Chain, Serum (Test 140455)Labcorp
Supports: The current Labcorp serum test and laboratory test information.
Learn More or Take a Private Next Step
The NfL Blood Test measures a biomarker associated with nerve cell injury. It is not a diagnosis, but it may provide useful information to review with a qualified healthcare provider.