Cerebrospinal Fluid (CSF) Qualitative Examination for Malignant Cells (Manual Microscopic Evaluation)

Why This Test Is Done

Doctors may order this test if you have symptoms like severe headaches, neck stiffness, numbness, weakness, or confusion. It’s also used after treatments like chemotherapy or radiation to check for lingering cancer cells in the CSF. Sometimes, it’s part of a broader evaluation for conditions like multiple sclerosis, meningitis, or brain tumors.

How the Test Works

A small amount of CSF is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then examined under a microscope by a trained lab technician or pathologist to identify any abnormal cells, including malignant ones. This is a manual process, meaning no automated machines are used for interpretation.

What to Expect Before the Test

You may receive a mild sedative to help you relax during the procedure. Avoid drinking alcohol or taking blood thinners before the test, as they can increase bleeding risk. Wear comfortable clothing and plan to rest afterward, as you might feel tired or have a mild headache for a few hours.

What to Expect During the Test

The doctor will insert a needle into your lower back to collect CSF. You may feel a brief pinch or pressure, but the procedure usually takes about 10–15 minutes. You’ll lie on your side with your knees bent, and the doctor will guide the needle carefully. Afterward, you’ll need to lie flat for a short time to prevent bleeding.