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Cerebrospinal Fluid (CSF) Protein by Nephelometry

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

This test measures the total protein content in your cerebrospinal fluid, which is the fluid surrounding your brain and spinal cord. It helps assess conditions affecting the central nervous system.

Quick summary

["Protein levels in CSF can indicate 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
24017-6
Short code
N men sg B Ag CSF Ql
Synonyms
N men sg B Ag CSF Ql
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 This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like headaches, neck stiffness, confusion, or neurological issues. It’s also used to diagnose conditions such as meningitis, multiple sclerosis, or brain tumors.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your back to collect a small amount of CSF, usually under mild sedation or local anesthesia. The procedure takes about 10–15 minutes.

What the Results Mean

Elevated protein levels may suggest inflammation, infection, or blood leakage into the CSF. Lower-than-expected levels could indicate certain genetic disorders or other rare conditions. Your results will be interpreted by a specialist based on your symptoms and medical history.

Common Conditions Monitored

This test is often used to monitor conditions like Guillain-Barré syndrome, Lyme disease, or autoimmune diseases affecting the nervous system. It can also help confirm diagnoses of conditions like subarachnoid hemorrhage or certain types of brain tumors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CSF Protein

Frequently asked questions

What does my protein level in CSF tell my doctor?
Your doctor will compare your CSF protein results with your symptoms, other test results, and medical history. For example, a significantly elevated protein level might point to an infection or inflammation in the central nervous system, while abnormal patterns could suggest a structural issue or genetic disorder.
How often will I need this test?
The frequency depends on your condition. Some patients need this test monthly, while others may only require it once or twice a year. Your doctor will determine the schedule based on your treatment plan and ongoing symptoms.
Can I drink or eat before this test?
No restrictions apply. You can eat, drink water, and take your usual medications as usual. The procedure itself doesn’t require fasting.
  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