Neurofilament Light Chain Blood Test
Neurofilament Light Chain (NfL) is a blood biomarker associated with nerve-cell injury. This test measures the concentration of NfL in your blood and provides one additional objective data point. It does not diagnose a specific neurological disease or injury. Private LabTestsOnDemand testing costs $350 and uses a standard blood draw at a participating Labcorp.
- $350 one-time self-pay price
- Physician-authorized laboratory order
- Blood draw at a participating Labcorp — not an at-home test
- Secure results, typically available 2–4 days after the draw
Most people complete the online order in about 2–3 minutes, then visit a participating Labcorp location for the blood draw.
Private self-pay purchase. Not a diagnostic test. No membership or recurring charge.
Self-pay price
$350
One-time. No insurance required.
Neurofilament Light Chain explained
What Is Neurofilament Light Chain?
NfL is a structural protein found in nerve cells.
It can enter the blood when nerve cells are injured.
A laboratory can measure its concentration in a blood sample.
The number must be interpreted in context — the test alone cannot identify the cause of a result.
Capabilities and limitations
What an NfL Result Can and Cannot Tell You
The test can
- Measure the NfL concentration in the blood sample
- Provide an additional objective data point
- Support a broader conversation with a healthcare professional
- Be considered alongside history, symptoms, imaging, and other testing
The test cannot
- Diagnose a concussion
- Diagnose dementia, Alzheimer's disease, or another neurological disorder
- Identify the exact location or cause of nerve cell injury
- Replace imaging, medical evaluation, or professional interpretation
- Predict an individual outcome with certainty
Price and access
NfL Blood Test Cost and Labcorp Process
The LabTestsOnDemand NfL blood test costs $350 as a one-time self-pay purchase. That price covers the physician-authorized laboratory order, the standard blood draw at a participating Labcorp, laboratory analysis, and secure result delivery. There is no membership, recurring charge, or separate Labcorp bill for this NfL order.
What the $350 price includes
- A physician-authorized laboratory order
- LabTestsOnDemand preparation of your Labcorp paperwork
- Blood collection at a participating Labcorp location
- Laboratory analysis and secure result delivery
- No separate Labcorp bill for this NfL order
How ordering through Labcorp works
- 1Order the NfL blood test through LabTestsOnDemand.
- 2A physician authorizes the order and LTOD prepares the paperwork.
- 3Visit a participating Labcorp for the standard blood draw.
- 4Receive secure results, typically 2–4 days after the draw.
This is not an at-home test. Physician interpretation of the result is not included in the $350 price.
What you are buying
Order Details and Requirements
$350 one-time self-pay price. No membership and no recurring charge.
A physician authorizes the laboratory order. Physician interpretation of your result is not included.
Blood collection occurs at a participating Labcorp location. This is not an at-home test.
Results are delivered securely and are typically available 2–4 days after the draw. This is a general expectation, not a guarantee.
No separate Labcorp bill for this order.
No insurance is required, and LabTestsOnDemand does not bill insurance for this test.
Your order is valid for 60 days.
No fasting is required before the blood draw.
Stop biotin supplements at least 72 hours before collection.
The test is currently unavailable in New York, New Jersey, and Rhode Island. Maryland is available.
Common motivations
Why People Consider Private NfL Testing
They already know about NfL and want access to the test
They want another data point before a medical appointment
They prefer a private self-pay option
They do not want to wait for an insurance process
They want to understand the test before deciding
Where NfL fits in
NfL Is One Part of a Bigger Picture
NfL, imaging, symptoms, medical history, neurological examination, and other tests may answer different questions. They are not substitutes for one another.
Symptoms & history
How you feel, when it started, personal and family medical background.
Physical & neurological exam
In-person evaluation performed by a qualified healthcare professional.
Imaging (e.g. MRI)
Structural view of the brain and nervous system.
NfL blood test
A blood biomarker associated with nerve cell injury — one objective data point.
Other laboratory tests
Additional blood work or diagnostics ordered by a clinician.
Specialist evaluation
Neurology or other specialty consultation when clinically indicated.
What happens after you order
What Happens After You Order
Step 1
Purchase confirmation
You'll get an automatic confirmation email as soon as your order goes through.
Step 2
Physician authorization
A physician authorizes the lab order for your test.
Step 3
Finalized lab paperwork
We'll email your finalized lab order document as soon as fulfillment is complete.
Step 4
Your Labcorp visit
Schedule your Labcorp visit for the next business day or later after ordering.
Step 5
Your secure online results
Results are typically available 2–4 days after the blood draw.
Fulfillment operates Monday–Friday, 9:00 AM–4:00 PM Eastern. Turnaround is a general expectation, not a guarantee.
Frequently asked questions
Common Questions
References
Authoritative sources
These references support the statements made on this page. They describe NfL as a biomarker associated with nerve-cell injury in research and monitoring settings; they do not establish NfL as a standalone diagnostic, screening, or predictive test for any individual.
Source 1
Neurofilaments as biomarkers in neurological disordersNature Reviews Neurology, 2018
Supports: NfL is a structural nerve-cell protein that can enter blood after nerve-cell injury, and blood NfL concentration is studied as a biomarker across neurological disorders.
Source 2
Neurofilament light chain as a biomarker in neurological disordersJournal of Neurology, Neurosurgery & Psychiatry, 2019
Supports: Blood NfL is a non-specific marker of neuroaxonal injury: it is associated with nerve-cell damage but does not identify the cause or location, and it is not a standalone diagnostic test.
Source 3
Neurofilaments as biomarkers in neurological disorders — towards clinical applicationNature Reviews Neurology, 2024
Supports: NfL results require clinical context; elevations occur across many conditions and with age, so a single value cannot confirm or rule out a specific disease.
Source 4
Neurofilament Light Chain, Serum (Test 140455)Labcorp, Current test directory
Supports: The Labcorp test directory cautions patients to stop biotin consumption at least 72 hours before collection because high-dose biotin may interfere with this test.
New to NfL?
Learn what Neurofilament Light Chain is, why it can appear in blood, and what an NfL measurement can and cannot tell you.
Read the NfL biomarker guideAlready have a result?
Learn why NfL values need age, laboratory-method, health-history, and clinical context—and why one number cannot diagnose or rule out a neurological condition.
Read the NfL results guideDecide With Clear Information
$350 one-time self-pay. Physician-authorized laboratory order. Blood draw at a participating Labcorp. No insurance required. Results typically available 2–4 days after the draw.
A physician authorizes the lab order. Blood collection is completed at a participating Labcorp location. Results are typically available 2–4 days after the draw.