Guided Fine-Needle Aspiration Cytology (CSF) for Cytologic Examination
This test involves collecting a small sample of cerebrospinal fluid (CSF) using a fine needle to examine cells under a microscope. It helps identify abnormal cells that may suggest conditions like infections, tumors, or inflammatory diseases in the brain and spinal cord.
["A key test for diagnosing neurological conditions by analyzing cell samples from CSF."]
Key facts at a glance
- LOINC
- 30580-5
- Short code
- CT Guided FNA
- Synonyms
- CT Guided FNA
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 136
- Ref high
- 145
- Critical range
- 120 N/A – 160 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- CPT
- 84295
- SNOMED
- 110741000
- 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
What Is the Purpose of This Test?
This test is typically performed when doctors suspect conditions such as brain tumors, infections (like meningitis), or other neurological disorders. It helps determine the presence of abnormal cells that may not be visible through standard imaging or blood tests alone.
How Is the Sample Collected?
A healthcare provider will insert a thin needle into the spinal column to collect a small amount of CSF. You may feel pressure or discomfort, but it usually doesn’t cause pain. The sample is then sent to the lab for microscopic examination.
What Can This Test Detect?
The test can detect abnormal cells, such as cancer cells, bacteria, or inflammatory markers. For example, it may identify leukemia cells in the CSF, signs of meningitis, or other neurological abnormalities that require further medical evaluation.
How Are Results Interpreted?
Results are reviewed by a pathologist, who examines the cells under a microscope. Abnormal findings may include clusters of cancer cells, signs of infection, or other markers that guide further medical decisions, such as additional treatments or diagnostic tests.
Reference range
Adult: 136-145 mmol/LN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test plays a critical role in diagnosing neurological diseases by providing direct evidence of abnormal cells in the CSF. It helps doctors determine the exact cause of symptoms like headaches, neurological deficits, or unexplained spinal fluid changes, guiding personalized treatment plans.
Short name
CSF FNA Cytology
Frequently asked questions
Why might my doctor recommend this test?
What are the possible risks or side effects of this procedure?
How long will it take to get results from this 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