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Myelocyte Count in Cerebrospinal Fluid (CSF)

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

This test measures the number of immature white blood cells (myelocytes) present in your cerebrospinal fluid (CSF). These cells are part of your body’s immune system and can help identify certain conditions affecting the brain or spinal cord.

Quick summary

["Myelocytes in CSF may signal inflammation, infection, or other neurological issues."]

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

Key facts at a glance

LOINC
30447-7
Short code
Myelocytes NFr CSF
Synonyms
Myelocytes NFr CSF
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 Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like headaches, neck stiffness, fever, or neurological concerns. It’s often used alongside other tests to diagnose conditions such as infections (e.g., meningitis), inflammatory diseases, or blood disorders affecting the central nervous system.

What to Expect Before the Test

No special preparation is needed. The test involves a simple lumbar puncture (spinal tap) where a small amount of CSF is collected. You may feel mild discomfort, but it’s usually brief. Avoid heavy lifting or strenuous activity for 24 hours afterward.

How the Test Works

The collected CSF sample is analyzed under a microscope to count myelocytes and other cells. This helps assess immune cell activity in the brain and spinal fluid environment.

Possible Results and Interpretation

Results are compared to typical ranges for myelocyte counts in CSF, though individual variations exist. Elevated counts may indicate immune responses or disorders, while very low counts could suggest normal or suppressed immune activity in the CNS.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated myelocyte counts in CSF can signal conditions like acute infections (e.g., bacterial meningitis), inflammatory diseases (e.g., multiple sclerosis), or reactive immune responses. Low counts may occur in chronic neurological conditions or after certain treatments. Always discuss results with your provider for personalized interpretation.

Short name

Myelocyte CSF Count

Frequently asked questions

What does an elevated myelocyte count in CSF mean?
An elevated count may suggest an active immune response, such as an infection, inflammation, or a rare blood disorder affecting the CNS. Your provider will consider your symptoms and other test results to guide further evaluation.
Can myelocytes in CSF be affected by medications?
Yes, certain medications (e.g., chemotherapy, steroids) or treatments for blood disorders may influence myelocyte counts in CSF. Your provider will account for these factors when reviewing your results.
How often is this test repeated?
The frequency depends on your symptoms and diagnosis. Your provider may repeat the test if initial results are unclear or if symptoms persist, but this is not standard for all cases.
  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