Cerebrospinal Fluid Protein by Electrophoresis (Qualitative)
This test measures the types and amounts of proteins in your cerebrospinal fluid (CSF), which surrounds your brain and spinal cord. It helps identify abnormalities that may suggest conditions like multiple sclerosis, infections, or other neurological issues.
["Protein patterns in CSF can reveal hidden neurological problems."]
Key facts at a glance
- LOINC
- 20487-5
- Short code
- N men sg A+Y Ag CSF Ql
- Synonyms
- N men sg A+Y Ag CSF Ql
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your doctor may order this test if you have symptoms like headaches, vision changes, numbness, weakness, or trouble with coordination. It’s also used to diagnose or monitor conditions such as multiple sclerosis, meningitis, or brain tumors. Sometimes, it’s part of a broader evaluation for unexplained neurological symptoms.
How the Test Works
A small amount of CSF is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then separated and analyzed using electrophoresis, a technique that separates proteins based on size and charge. The results show different protein bands, which can indicate the presence of abnormal proteins or patterns.
What to Expect Before the Test
You may need to fast for a few hours before the test, but this isn’t always required. Wear comfortable clothing and bring any necessary medications. Inform your doctor about any medications you’re taking, especially blood thinners, as they may affect the procedure.
What to Expect During the Test
The procedure involves inserting a needle into your lower back to collect CSF. You may feel a slight pinch or pressure, but it’s usually not painful. The test itself takes about 10–15 minutes, and you’ll be able to return to your normal activities afterward.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal protein patterns in CSF can signal serious conditions. For example, high levels of immunoglobulin G (IgG) may indicate a demyelinating disease like multiple sclerosis. Other patterns, such as elevated albumin or the presence of abnormal proteins, could suggest infections, inflammation, or tumors. Your doctor will interpret the results in the context of your symptoms and medical history.
Short name
CSF Protein Electrophoresis (Qual)
Frequently asked questions
How long does it take to get the results of this test?
Is there any preparation needed before this test?
Can I drive myself home after the 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.
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