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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 found in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). Protein levels can help identify issues like inflammation, infections, or blood leakage into the brain.

Quick summary

["Protein in CSF may signal conditions affecting your nervous system."]

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

Key facts at a glance

LOINC
5078-1
Short code
C pneum Ab Ser-aCnc
Synonyms
C pneum Ab Ser-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 doctor may recommend this test if you have symptoms like headaches, neck stiffness, confusion, or neurological problems. It’s also used to diagnose conditions such as meningitis, brain tumors, or multiple sclerosis, or to check for bleeding in the brain.

What to Expect Before the Test

You’ll likely have a small needle inserted into your lumbar spine to collect a sample of CSF. This is usually done in a clinic or hospital setting. You may feel a slight pinch, but the procedure is quick and painless. No special preparation is needed, but inform your doctor about any medications you’re taking.

What the Results Mean

High protein levels in CSF can indicate inflammation, infections, or blood leakage. Low levels might suggest certain neurological disorders or blockages. Your doctor will interpret results in relation to your symptoms and medical history.

Common Conditions Linked to Abnormal Results

Elevated protein levels may be seen in conditions like meningitis, encephalitis, or brain tumors. Low protein levels could be linked to conditions such as hydrocephalus (fluid buildup) or certain genetic disorders affecting protein transport.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

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), inflammation (such as multiple sclerosis), bleeding into the brain, or certain genetic or metabolic disorders. Your doctor will consider your symptoms and other test results to determine the cause.
How is this test different from a general blood protein test?
This test specifically measures protein in cerebrospinal fluid, which is distinct from blood protein tests. CSF protein reflects what’s in the fluid surrounding your brain and spinal cord, while blood protein tests measure proteins circulating in your bloodstream. The two can give different insights into health issues.
Can lifestyle changes affect CSF protein levels?
While lifestyle factors like diet or exercise may influence overall protein metabolism, they typically do not directly affect CSF protein levels. This test is primarily used to assess conditions affecting the nervous system, so lifestyle changes are less relevant to interpreting the results directly.
  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