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Cerebrospinal Fluid Protein by Qualitative Immunoassay (Rapid Probe)

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

This test quickly checks for protein presence in your cerebrospinal fluid (CSF), often used to evaluate conditions affecting the brain or spinal cord.

Quick summary

["A rapid screening for abnormal protein levels in CSF may help diagnose neurological issues like infections, inflammation, or blood leaks into the brain’s fluid space."]

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

Key facts at a glance

LOINC
86590-7
Short code
S pneum Ag CSF Ql IA.rapid
Synonyms
S pneum Ag CSF Ql IA.rapid
Category
coagulation
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia-rapid
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 doctor may recommend this test if you have symptoms like severe headaches, neck stiffness, vision changes, or neurological problems that suggest conditions like meningitis, multiple sclerosis, or a brain bleed. It’s also used to monitor certain spinal cord injuries or tumors.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your back to collect a small amount of CSF. The test involves a rapid probe immunoassay to detect protein presence.

What the Results Mean

A positive result (detecting protein) may indicate inflammation, infection, or bleeding in the brain or spinal cord. A negative result means no protein was detected, but further tests may still be needed to diagnose your condition.

Common Conditions This Test Helps Diagnose

This test can help identify issues like bacterial or viral meningitis, subarachnoid hemorrhage, multiple sclerosis, or other neurological disorders causing abnormal protein levels in CSF.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Protein Screening (Rapid Probe)

Frequently asked questions

What does a positive result mean?
A positive result means protein was detected in your CSF, which could suggest conditions like meningitis, a brain bleed, or other neurological issues. Your doctor will discuss next steps based on your symptoms and test results.
How soon will I get my results?
Results are typically available within minutes to a few hours, depending on lab processing. Your doctor will contact you with the findings.
Can I eat or drink before this test?
No restrictions apply. You can eat, drink, or take medications as usual before the test.
  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