Oligoclonal Bands, IgG, Cerebrospinal Fluid, Qualitative by Isoelectric Focusing
This test looks for abnormal patterns of antibodies (immunoglobulins, mainly IgG) in cerebrospinal fluid using a technique called isoelectric focusing. It helps support the diagnosis of conditions such as multiple sclerosis.
["Oligoclonal bands in CSF can indicate inflammation within the central nervous system, but results must be interpreted alongside clinical findings and other tests."]
Key facts at a glance
- LOINC
- 56764-4
- Short code
- Oligoclonal Bands IgG CSF Ql IEF
- Synonyms
- Oligoclonal Bands IgG CSF Ql IEF
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- isoelectric-focusing
- CPT
- 82784
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
The test examines cerebrospinal fluid, the fluid that surrounds the brain and spinal cord, for oligoclonal bands. These are clusters of similar antibody proteins produced by immune cells. A qualitative result reports whether an abnormal banding pattern is present or absent, and the isoelectric focusing method separates proteins to reveal these patterns.
Why It Is Ordered
Doctors order this test when they suspect inflammation or immune activity in the central nervous system, most commonly when evaluating possible multiple sclerosis. It may also be used in the workup of other neurological conditions that can cause similar fluid changes.
How the Sample Is Collected
The cerebrospinal fluid sample is usually obtained through a lumbar puncture, also called a spinal tap. A small amount of fluid is collected and sent to the laboratory. Because the result is often compared with a blood sample, a serum specimen may be collected at the same time.
What Results Mean
A positive result means oligoclonal bands are present in the cerebrospinal fluid. This can point to immune activity in the nervous system, but it is not specific to any single disease. A negative result means the banding pattern is not detected. Your doctor will interpret the result together with your symptoms, physical examination, imaging, and other laboratory tests.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Oligoclonal bands are a supportive marker rather than a stand-alone diagnosis. Their presence is commonly associated with multiple sclerosis, but similar findings can occur in other inflammatory, infectious, or immune-mediated neurological conditions. The pattern seen when CSF is compared with serum can help distinguish antibody production within the central nervous system from antibody that has entered from the bloodstream. Results should always be interpreted in the full clinical context.
Short name
CSF Oligoclonal Bands
Frequently asked questions
Does a positive result mean I have multiple sclerosis?
Is the lumbar puncture painful?
Do I need to prepare for this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy