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Cerebrospinal Fluid (CSF) Protein Measurement (Mass Concentration)

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

This test measures the total protein content in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). It helps assess conditions affecting the brain’s protective barrier or fluid balance.

Quick summary

["Protein levels in CSF can signal inflammation, bleeding, or other neurological issues."]

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

Key facts at a glance

LOINC
109802-9
Short code
Neuronal Ab Msmt CSF
Synonyms
Neuronal Ab Msmt CSF
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 Is Done

Your doctor may order this test if you have symptoms like headaches, neck stiffness, confusion, or signs of a brain infection, injury, or swelling. It’s also used to monitor conditions like multiple sclerosis, meningitis, or brain tumors.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your back to collect a small amount of CSF. You might feel a brief pinch, but it’s usually over quickly. Lie still afterward to prevent leakage.

What the Results Mean

Normal results typically show lower protein levels compared to blood, as CSF is designed to be less protein-rich. Abnormally high levels may indicate inflammation, infection, or blood leakage into the brain.

Common Conditions Affecting Results

Elevated protein levels can occur with conditions like meningitis, encephalitis, or multiple sclerosis. Low levels may suggest a blockage in the CSF flow or certain genetic disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Protein Level

Frequently asked questions

How long will I need to wait for results?
Results are usually available within 1–3 business days, depending on lab processing times. Your doctor will discuss them with you during your follow-up visit.
Can I drink water before the test?
Yes, you can drink water, but avoid caffeine or alcohol before the procedure. Hydration helps prevent dizziness, but don’t overdo it to avoid discomfort during the needle insertion.
Will the test hurt, and how long does it take?
The procedure itself is brief (a few minutes) and may cause mild discomfort or soreness afterward. Most people feel minimal pain, though some describe it as a sharp pinch. Recovery is quick, and you can resume normal activities soon.
  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