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Protein in Cerebrospinal Fluid (CSF) – Mass Concentration

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

This test measures the total amount of protein found in your cerebrospinal fluid, the clear fluid that surrounds your brain and spinal cord. It helps assess conditions affecting the brain’s protective barrier or fluid balance.

Quick summary

["Measuring CSF protein can help diagnose or monitor neurological conditions."]

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

Key facts at a glance

LOINC
2879-5
Short code
Prot CSF Ql
Synonyms
Prot 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 Is Done

Your doctor may order this test if you have symptoms like headaches, neurological issues, or signs of inflammation in the brain or spinal cord. It can also be part of investigations for conditions like meningitis, multiple sclerosis, or brain tumors.

What to Expect Before the Test

You’ll likely have a small needle inserted into your spine to collect a sample of CSF. This is usually done in a hospital setting with sedation or local anesthesia. Avoid vigorous activity afterward to prevent complications.

What the Results Mean

Elevated protein levels may indicate inflammation, infection, or damage to the blood-brain barrier. Normal results suggest no significant protein leakage or fluid imbalance. Your doctor will interpret results in the context of your symptoms and other tests.

Common Conditions Monitored

This test is often used to diagnose or monitor conditions like meningitis, Guillain-Barré syndrome, multiple sclerosis, or subarachnoid hemorrhage. It may also help assess brain swelling or other neurological disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Elevated CSF Protein Levels

Short name

CSF Protein

Frequently asked questions

What could cause high protein levels in CSF?
High protein levels in CSF can result from conditions that disrupt the blood-brain barrier (e.g., meningitis, brain tumors) or from increased protein production in the brain (e.g., certain neurological diseases). Low levels may suggest normal fluid balance or mild conditions without significant protein leakage.
How often should I get this test?
Your doctor will determine how often you need this test based on your symptoms, diagnosis, or treatment plan. Follow-up tests may be scheduled if your condition requires ongoing monitoring.
Does this test hurt?
The procedure itself may cause mild discomfort or soreness at the injection site, but most people describe it as brief and manageable. You’ll likely feel better within a day or two, and your doctor may provide instructions for recovery.
  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