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Cerebrospinal fluid (CSF) protein mass concentration (total protein)

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

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

Quick summary

["Protein in CSF may indicate 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
31907-9
Short code
N men sg A Ag CSF Ql
Synonyms
N men sg A Ag 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 Is This Test Done?

Your healthcare provider may order this test if you have symptoms like headaches, neck stiffness, confusion, or neurological problems. It’s also used to check for conditions such as meningitis, multiple sclerosis, or brain tumors.

What to Expect Before the Test

You’ll have a small needle inserted into your lumbar spine to collect CSF. The procedure is quick but may cause mild discomfort. No special preparation is needed, but inform your doctor about any medications you’re taking.

What the Results Mean

Normal protein levels in CSF are generally lower than in blood. Elevated levels may suggest inflammation, infection, or blood leakage into the CSF. Very low levels could indicate certain neurological disorders.

Common Conditions Monitored

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

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Elevated protein levels in CSF often point to conditions causing inflammation, immune responses, or blood mixing with the fluid. Low levels may indicate demyelinating diseases or other rare neurological disorders. Always discuss results with your provider for personalized interpretation.

Short name

CSF Protein Level

Frequently asked questions

What does a high CSF protein level usually mean?
A high protein level in CSF can suggest inflammation (e.g., meningitis), immune-related diseases (e.g., multiple sclerosis), or bleeding into the spinal fluid. Your doctor will consider your symptoms and other test results to determine the cause.
Can diet or medications affect this test?
Dietary changes or most over-the-counter medications typically don’t affect CSF protein levels. However, certain medications (like steroids) or conditions (e.g., kidney disease) may influence protein production in the blood, indirectly affecting CSF results. Always ask your doctor about potential interactions.
How often should I get this test?
Frequency depends on your symptoms, diagnosis, or treatment plan. If you have a chronic condition (e.g., multiple sclerosis), your doctor may order this test periodically to monitor progression or response to treatment. Follow their guidance.
  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