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Cerebrospinal Fluid Protein by Nephelometry

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 blood-brain barrier.

Quick summary

["Protein levels in CSF can signal inflammation, infection, or structural issues in the central nervous system."]

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

Key facts at a glance

LOINC
109799-7
Short code
N men sg B Ag Msmt CSF
Synonyms
N men sg B Ag 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 Might Be Ordered

Your doctor may recommend this test if you have symptoms like headaches, neck stiffness, vision changes, or neurological issues that could involve the brain’s protective fluid. It’s also used to monitor conditions like meningitis, multiple sclerosis, or brain tumors.

What to Expect Before the Test

You’ll likely have a small needle inserted into your lower back to collect CSF. The procedure is quick but may cause mild discomfort. No special preparation is needed, but inform your doctor about any medications or recent infections.

What the Results Mean

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

Common Conditions Affecting Results

Elevated protein levels can occur in infections (like meningitis), autoimmune diseases (like multiple sclerosis), or tumors. Low levels are less common but may relate to metabolic disorders or rare genetic conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CSF Protein Level

Frequently asked questions

How long will it take to get my results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your doctor will contact you once they’re ready to discuss them.
Can I eat or drink before this test?
No special diet is required. You can eat and drink normally, but avoid caffeine or alcohol in the hours before the procedure if your doctor advises it.
Will I need to stay still during the test?
Yes, you’ll lie on your side with your knees bent. Staying still helps ensure the needle reaches the correct spot for CSF collection. The procedure itself takes only a few minutes.
  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