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Cerebrospinal fluid protein concentration (mass concentration)

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

This test measures the amount of protein in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). It can help diagnose conditions affecting the central nervous system.

Quick summary

["Protein levels in CSF may indicate inflammation, infection, or other neurological issues."]

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

Key facts at a glance

LOINC
79629-2
Short code
R-B-AIB CSF-sCnc
Synonyms
R-B-AIB CSF-sCnc
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 doctor may recommend this test if you have symptoms like headaches, neck stiffness, vision changes, or neurological problems. It’s often used to check for conditions like meningitis, multiple sclerosis, or tumors in the brain or spinal cord.

What to Expect Before the Test

No special preparation is usually needed. You may receive a spinal tap (lumbar puncture) under sterile conditions, where a small needle is inserted to collect CSF. You might feel mild pressure or discomfort, but it’s generally quick and painless.

What the Results Mean

Elevated protein levels could suggest inflammation, infection, or blood leakage into the CSF. Lower-than-normal levels might indicate certain genetic disorders or other rare conditions. Your doctor will interpret results in the context of your symptoms and medical history.

Common Conditions This Test Helps Diagnose

This test can help diagnose conditions like meningitis, encephalitis, multiple sclerosis, Guillain-Barré syndrome, or tumors in the central nervous system. It may also identify issues with the blood-brain barrier or protein metabolism in the brain.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Protein in CSF is usually low and stable, but changes can signal serious neurological problems. High levels may indicate immune responses, infections, or structural abnormalities in the brain’s protective layers.

Short name

CSF Protein Level

Frequently asked questions

What causes abnormal protein levels in CSF?
Abnormal protein levels can result from infections (like meningitis), inflammatory diseases (such as multiple sclerosis), or conditions affecting the blood-brain barrier. Rarely, genetic disorders or tumors may also alter protein concentrations.
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 your follow-up visit.
Can diet or medications affect this test?
Diet or over-the-counter medications usually don’t affect CSF protein levels. However, avoid NSAIDs (like ibuprofen) before the test, as they may temporarily alter protein measurements in some cases.
  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