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Cerebrospinal Fluid (CSF) Protein, Total

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

This test measures the total amount of protein found in your cerebrospinal fluid (the 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 neurological conditions or bleeding into the brain’s protective fluid."]

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

Key facts at a glance

LOINC
6498-0
Short code
N men sg B Ag CSF Ql LA
Synonyms
N men sg B Ag CSF Ql LA
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
la
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. It’s also used to diagnose conditions such as meningitis, multiple sclerosis, or subarachnoid hemorrhage.

What to Expect Before the Test

You’ll lie down on your side with your head slightly raised in a special bed called a lumbar puncture table. A nurse will clean the lower back area and insert a small needle into your spinal canal to collect a small sample of CSF. You may feel a brief pinch, but the procedure is usually quick and painless.

What Happens During the Test

Once the needle is in place, a small amount of CSF will be drawn into a sterile vial. The sample is then sent to a lab for analysis. The procedure typically takes about 15–30 minutes, and you’ll be monitored closely for any complications.

What the Results Mean

Normal protein levels in CSF are usually lower than those in blood. Elevated protein levels can indicate inflammation, infections, or blood in the CSF. Very low levels might suggest certain genetic or metabolic disorders. Your doctor will interpret results in relation to your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CSF Protein

Frequently asked questions

How often will I need this test?
This test is usually done once, but your doctor may order it again if symptoms persist or if further evaluation is needed. Frequency depends on your condition and treatment plan.
Can I eat or drink before the test?
You can eat and drink normally before the test, as it doesn’t affect the sample collection. However, inform your doctor about any medications or supplements you’re taking, as they may influence results.
Will I experience any side effects?
Most people experience mild discomfort or soreness at the injection site. Rarely, there may be temporary headaches, dizziness, or bruising. Severe complications are uncommon but can include infections or nerve damage—always discuss any concerns with your doctor.
  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