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Cerebrospinal Fluid (CSF) Protein by Nephelometry

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

This test measures the total protein levels in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). It helps assess conditions affecting the central nervous system.

Quick summary

["Protein levels in CSF can signal inflammation, infection, or structural issues in the brain or spinal cord."]

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

Key facts at a glance

LOINC
6494-9
Short code
N men sg A Ag CSF Ql LA
Synonyms
N men sg A Ag CSF Ql LA
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
la
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Is Cerebrospinal Fluid (CSF) Protein Used For?

CSF protein testing is often used to diagnose or monitor conditions such as meningitis, multiple sclerosis, brain tumors, or other neurological disorders. Elevated protein levels may indicate inflammation, blood leakage, or abnormal cell activity in the central nervous system.

Why Might You Need This Test?

Your doctor may order this test if you have symptoms like severe headaches, neck stiffness, vision changes, or neurological issues. It’s also part of diagnostic workups for suspected infections, autoimmune diseases, or structural abnormalities in the brain.

How Is the Test Performed?

A small amount of CSF is collected through a procedure called lumbar puncture (spinal tap). The fluid is then analyzed in a lab using nephelometry, a method that detects protein levels by measuring light scattering.

What Are Common Results and Their Meanings?

Results are compared to standard ranges, but exact values depend on the lab. High protein levels may suggest inflammation, infection, or blood in the CSF. Low levels could indicate normal function or certain neurological conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated CSF protein is often associated with conditions like meningitis (infection), multiple sclerosis (autoimmune), or brain tumors. It may also appear in cases of blood leakage into the CSF or chronic neurological diseases. Low levels are less concerning but can sometimes indicate normal function or rare conditions.

Short name

CSF Protein

Frequently asked questions

What causes abnormal CSF protein levels?
Abnormal CSF protein levels can result from infections (e.g., bacterial or viral meningitis), inflammatory diseases (e.g., Guillain-Barré syndrome), demyelinating disorders (e.g., multiple sclerosis), or structural issues like brain tumors or cysts.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will discuss findings with you during a follow-up visit.
Can lifestyle changes affect CSF protein levels?
Lifestyle factors like diet or stress generally do not directly influence CSF protein levels, as this fluid is produced by the brain’s own mechanisms. However, underlying conditions (e.g., infections) may require medical treatment.
  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