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Cerebrospinal Fluid (CSF) Protein Measurement

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

This test measures the total protein levels in your cerebrospinal fluid, which is the fluid surrounding your brain and spinal cord. It helps assess conditions affecting the brain’s protective barrier.

Quick summary

["Protein levels in CSF can signal inflammation, bleeding, or other neurological issues."]

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

Key facts at a glance

LOINC
24590-2
Short code
MR Brain
Synonyms
MR Brain
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

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

What to Expect Before the Test

You’ll receive a spinal tap (lumbar puncture) where a small needle is 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 you’re taking.

What the Results Mean

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

Common Conditions Monitored or Diagnosed

This test helps diagnose or monitor conditions like meningitis, encephalitis, multiple sclerosis, brain tumors, or Guillain-Barré syndrome. Elevated protein levels can also be seen in conditions affecting the blood-brain barrier.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Protein

Frequently asked questions

What does a normal CSF protein level look like?
There is no single reference range for CSF protein because levels can vary based on age, health status, and specific medical conditions. Your results will be compared to your doctor’s expectations based on your symptoms and test context.
How often should I get this test?
Your doctor will determine how often you need this test based on your diagnosis, symptoms, or treatment plan. Some conditions may require regular monitoring, while others may only need it once.
Can lifestyle changes affect CSF protein levels?
While diet or exercise generally don’t directly influence CSF protein levels, managing underlying conditions (like infections or inflammation) can help stabilize results. Always follow your doctor’s advice regarding lifestyle adjustments.
  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