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Cerebrospinal Fluid (CSF) Oligoclonal Bands by Electrophoresis

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

This test measures specific protein patterns in your spinal fluid to help identify certain immune-related conditions.

Quick summary

["This test helps diagnose conditions affecting the brain and spinal cord by detecting unusual protein bands linked to immune activity."]

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

Key facts at a glance

LOINC
38525-2
Short code
Oligoclonal Bands Ur Elph-mCnc
Synonyms
Oligoclonal Bands Ur Elph-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
electrophoresis
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What This Test Measures

Oligoclonal bands are small clusters of proteins found in the cerebrospinal fluid (CSF). They appear as distinct bands on an electrophoresis gel, which separates proteins based on size and charge. This test looks for these bands, which can be normal or may indicate an immune response in the central nervous system.

Why It’s Done

Doctors may order this test if you have symptoms like numbness, weakness, or trouble with coordination, especially if other tests suggest conditions like multiple sclerosis, neuromyelitis optica, or other inflammatory or infectious diseases of the nervous system.

Sample Collection and Preparation

A small amount of cerebrospinal fluid is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then sent to the lab, where it undergoes electrophoresis to separate proteins and identify the presence of oligoclonal bands.

What to Expect Before the Test

You may need to fast for a few hours before the procedure, but no special preparation is required for the test itself. You’ll likely be given a mild sedative to help you relax during the lumbar puncture.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Oligoclonal Bands

Frequently asked questions

What does a positive result mean?
A positive result (presence of oligoclonal bands) may indicate an immune response in your central nervous system, which can support a diagnosis of conditions like multiple sclerosis or other inflammatory neurological diseases. However, this test alone isn’t enough to diagnose a specific condition—your doctor will consider your symptoms, medical history, and other test results.
Can this test be used to monitor treatment?
Yes, this test can sometimes be used to monitor certain immune-mediated conditions. Changes in the pattern or presence of oligoclonal bands over time may help track the progression or response to treatment, though results depend on the specific condition being managed.
Is there any risk or discomfort with this test?
The lumbar puncture carries a small risk of headache, infection, or bruising at the injection site. Most people experience mild discomfort during the procedure, but you’ll be monitored closely by medical staff. Most people return to normal activities shortly after.
  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