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Cerebrospinal Fluid (CSF) Malignant Cell Count (Qualitative)

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

This test checks for the presence of abnormal cells, such as cancer cells, in your cerebrospinal fluid (CSF). It helps doctors determine if there is a tumor or infection affecting your brain or spinal cord.

Quick summary

["This test helps identify potential brain or spinal cord cancers or infections by examining fluid from your brain and spinal column."]

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

Key facts at a glance

LOINC
44892-8
Short code
Malignant cells NFr CSF
Synonyms
Malignant cells 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 Is Done

Your doctor may recommend this test if you have symptoms like severe headaches, neck stiffness, nausea, vision changes, or neurological issues. It’s also used to monitor conditions like meningitis, brain tumors, or other central nervous system diseases.

What to Expect Before the Test

You’ll likely have a lumbar puncture (spinal tap) where a small needle is inserted into your lower back to collect CSF. The procedure is quick but may cause mild discomfort. You’ll need to be in a lying position for a short time afterward.

What the Test Results Mean

Positive results (detecting abnormal cells) may indicate a brain tumor, leukemia, or other cancers spreading to the CSF. Negative results mean no obvious malignant cells were found, but other tests may still be needed to diagnose conditions like infections or inflammation.

Common Reasons for Testing

Doctors use this test to diagnose or rule out serious conditions affecting the brain or spinal cord, such as brain tumors, multiple myeloma, or metastatic cancer. It’s also used in follow-up care for patients with known CNS diseases.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Malignant Cells (Qualitative)

Frequently asked questions

How long will I need to wait for my results?
Results are typically available within a few days to a week, depending on lab processing. Your doctor will discuss them with you during your follow-up visit.
Can I drink water before the test?
Yes, you can drink water, but avoid caffeine or alcohol before the procedure. Follow your doctor’s specific instructions for fasting if needed.
What are the risks or side effects of this test?
The most common side effect is mild headache or soreness at the injection site. Rarely, there may be bruising, infection, or spinal fluid leakage. Your doctor will explain risks during your appointment.
  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