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Cerebrospinal Fluid Protein Analysis (Qualitative or Quantitative)

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

This test measures protein levels in cerebrospinal fluid (CSF), the fluid that surrounds the 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
9374-0
Short code
Character CSF
Synonyms
Character 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, seizures, or neurological problems. It’s also used to diagnose conditions such as meningitis, multiple sclerosis, or tumors in the central nervous system.

What to Expect Before the Test

You’ll likely have a lumbar puncture (spinal tap), where a small needle is inserted into your lower back to collect CSF. The procedure is quick but may cause temporary discomfort. No special preparation is needed, but inform your doctor about any medications you’re taking.

What the Results Mean

Results may show elevated or normal protein levels. High protein levels could indicate inflammation, infection, or blood leakage into the CSF. Low levels might suggest certain genetic disorders or other rare conditions.

Common Conditions Monitored

This test helps diagnose or monitor conditions like meningitis, encephalitis, multiple sclerosis, Guillain-Barré syndrome, or brain tumors. It can also evaluate spinal cord injuries or other neurological issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Protein Test

Frequently asked questions

How is this test typically performed?
The test involves collecting CSF through a procedure called a lumbar puncture. A small needle is inserted into your lower back, and a small amount of fluid is withdrawn for analysis. The test itself is usually quick, but you may feel mild discomfort during the procedure.
What are the possible risks or side effects?
The most common risk is a mild headache or soreness at the injection site. Rarely, complications like infection or nerve damage may occur, but these are uncommon with proper medical care.
Can I drink or eat before the test?
No special diet or restrictions are needed before this test. You can eat and drink normally, but inform your doctor about any medications you’re taking to avoid potential interactions.
  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