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Cerebrospinal Fluid (CSF) White Blood Cell Count (Qualitative)

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

This test checks for abnormal white blood cells in your spinal fluid, which may indicate inflammation, infection, or other neurological conditions.

Quick summary

["Abnormal results could signal a need for further evaluation of your brain or spinal cord health."]

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

Key facts at a glance

LOINC
28380-4
Short code
DIFFICULTYCONCENTRATING
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
reported-hiv-ssc
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test if you have symptoms like headaches, neck stiffness, fever, confusion, or neurological issues (e.g., numbness, weakness). It’s often used to diagnose conditions like meningitis, multiple sclerosis, or other spinal fluid abnormalities.

What to Expect During the Test

A small amount of spinal fluid is collected via a procedure called a lumbar puncture (spinal tap). You’ll lie on your side, and a needle is inserted into your lower back. The fluid is then sent to the lab for analysis.

Possible Results and Next Steps

A qualitative test doesn’t provide exact numbers but can show if white blood cells are present. High levels may suggest infection or inflammation. Your doctor will discuss results and next steps, such as additional tests or treatments.

Common Conditions This Test Helps Diagnose

This test helps identify conditions like bacterial or viral meningitis, Guillain-Barré syndrome, multiple sclerosis, or other neurological disorders affecting the spinal fluid.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF WBC Qualitative

Frequently asked questions

What does a positive or abnormal result mean?
A positive qualitative result for white blood cells in CSF typically means there’s an abnormal presence, which could indicate inflammation, infection, or other neurological issues. Your doctor will guide you on whether further testing (like cultures or imaging) is needed to determine the cause.
How long will I need to wait for results?
Results from a qualitative CSF white blood cell test are usually available within 1–2 business days, depending on lab processing times. Your doctor will contact you once results are ready.
Can I eat or drink before this test?
You can eat and drink normally before the test, as it doesn’t require fasting. However, inform your doctor about any medications or supplements you’re taking, as some may affect spinal fluid analysis.
  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