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Cerebrospinal Fluid (CSF) Total Protein by Nephelometry

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

This test measures the total protein content in your cerebrospinal fluid, which is the clear fluid surrounding your brain and spinal cord. Protein levels can help identify issues like inflammation, infections, or blood leakage into the CSF.

Quick summary

["Protein in CSF may signal underlying neurological conditions or infections."]

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

Key facts at a glance

LOINC
40668-6
Short code
RUBV IgG CSF Ql IA
Synonyms
RUBV IgG CSF Ql IA
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
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 neurological problems. It’s also used to diagnose conditions such as meningitis, multiple sclerosis, or brain tumors.

What to Expect Before the Test

No special preparation is needed. You’ll likely have a small needle inserted into your back to collect a small amount of CSF. This is usually done in a hospital or clinic setting.

What the Results Mean

Normal protein levels in CSF are generally lower than in blood. Elevated levels may suggest inflammation, infection, or blood in the CSF, while very low levels might indicate certain genetic disorders or severe brain swelling.

Common Conditions Affecting Results

High protein levels can be linked to conditions like multiple sclerosis, encephalitis, or certain types of tumors. Low protein levels may be seen in conditions such as hydrocephalus or certain metabolic disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Protein Level

Frequently asked questions

What causes protein levels in CSF to be higher than usual?
Higher-than-normal protein levels in CSF can result from inflammation, infections (such as meningitis), demyelinating diseases (like multiple sclerosis), or bleeding into the spinal fluid.
How is this test different from a blood protein test?
This test measures protein specifically in cerebrospinal fluid, which is distinct from blood protein tests. CSF protein levels can reflect conditions affecting the brain’s protective environment differently than blood protein levels.
Can diet or medications affect CSF protein levels?
While diet and medications typically don’t directly affect CSF protein levels, certain conditions or treatments that influence inflammation or blood-brain barrier function may indirectly impact results.
  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