Body fluid cytology (ascitic fluid, CSF and other fluids)
Quick answer: Fluid cytology looks at cells in a body fluid under a microscope to check for infection, inflammation or abnormal (cancer) cells. Doctors order it when fluid builds up in the belly or elsewhere, or when spinal fluid is tested, to help find the cause.
- SampleFluid
- TakesAbout 15 to 45 minutes for fluid collection, depending on the site
- Before the testThe fluid is collected by a doctor with a needle, who will tell you how to prepare.
How the test is done
- 1The doctor explains the procedure and the skin over the fluid is cleaned
- 2Numbing medicine may be injected into the skin first
- 3A needle is passed into the fluid, sometimes guided by ultrasound, and fluid is drawn off
- 4For spinal fluid you lie curled on your side while a needle goes into the lower back
- 5The fluid is sent to the lab, where cells are spread on slides and examined
What your results can mean
Reading your report
A pathologist examines the cells under a microscope and writes a report; discuss what it means for you with your doctor.
If the result is outside the usual range
The cells can show signs of infection, such as many white cells, inflammation, or abnormal cells that can point to cancer. A result with no abnormal cells does not fully rule out cancer, and other fluid tests are usually done as well.
Who usually has this test
People with fluid building up in the belly, around the lungs or heart, or people having spinal fluid tested for infection or other causes.
Risks and aftercare
You may feel soreness at the needle site; after a spinal tap, lying flat and drinking fluids may help a headache, and seek help for fever, increasing pain or leaking.
Names and options
Also called: fluid cytology, ascitic fluid cytology, CSF cytology, malignant cells in fluid
Options
- Belly fluid (ascitic fluid)
- Spinal fluid (CSF)
- Other body fluid
Listed by the hospital as
- ASCITIC FLUID, CYTOLOGY
- CSF, CYTOLOGY
- CYTOLOGY, FLUID
Questions about this test
What is ascitic fluid?
Ascitic fluid is fluid that collects in the belly, often from liver disease, infection, heart failure or cancer. Testing it helps find the cause.
Will removing fluid make me feel better?
When a lot of fluid is drawn off, breathing or belly discomfort can ease. Fluid may build up again until the cause is treated.
What does malignant cells seen mean?
It means cells in the fluid look like cancer cells. Your doctor will arrange further tests to find where they came from and plan treatment.
Related tests
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.