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Cerebrospinal Fluid (CSF) Protein Mass Concentration

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 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
109782-3
Short code
MAG Ab Msmt CSF
Synonyms
MAG Ab Msmt CSF
Category
glucose
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, neck stiffness, vision changes, or neurological issues that could involve the brain or spinal cord. It’s also used to check for conditions such as meningitis, multiple sclerosis, or tumors.

What to Expect Before the Test

You’ll likely have a small needle inserted into your back to collect a sample of CSF. This is usually done in a hospital or clinic and takes a few minutes. You may feel a brief pinch, but the procedure is quick.

What the Results Mean

Normal protein levels in CSF are generally lower than in blood. Elevated levels often point to inflammation, infection, or other abnormalities in the central nervous system.

Common Conditions Monitored

High protein levels can help diagnose or track conditions like meningitis, encephalitis, multiple sclerosis, or brain tumors. Low levels may suggest certain genetic disorders or other rare conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for identifying neurological disorders early, guiding treatment decisions, and monitoring disease progression. It helps doctors differentiate between infections, autoimmune diseases, and structural problems in the brain and spinal cord.

Short name

CSF Protein Level

Frequently asked questions

What causes abnormal protein levels in CSF?
Abnormal protein levels in CSF can result from infections (like meningitis), inflammatory diseases (such as multiple sclerosis), brain tumors, or other neurological conditions. Blood-brain barrier issues or genetic factors may also play a role.
How long does it take to get results from this test?
Results are typically available within a few days, depending on lab processing times. Your doctor will discuss the findings with you during your follow-up visit.
Can diet or medications affect CSF protein levels?
Dietary factors rarely affect CSF protein levels, but certain medications (like steroids) or conditions (such as severe infections) may influence results. Always inform your doctor about all medications you’re taking.
  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