Cerebrospinal Fluid White Blood Cell Count (Qualitative)

Why This Test Matters

White blood cells in the CSF are normally very low or absent. Elevated counts can signal conditions like meningitis, encephalitis, or other inflammatory processes. The test is often performed alongside other CSF tests (such as protein or glucose levels) for a full assessment.

How the Test Works

A small sample of CSF is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then examined under a microscope to count white blood cells. This is a qualitative test, meaning it provides a yes/no or low/high indication rather than a precise number.

When You Might Need This Test

Your doctor may order this test if you have symptoms like severe headache, neck stiffness, fever, confusion, or neurological symptoms (e.g., numbness, weakness). It’s also used to monitor conditions like multiple sclerosis or other central nervous system diseases.

What to Expect Before the Test

You’ll likely receive a local anesthetic to numb the area where the needle will be inserted. You may need to lie still for a short time afterward. Avoid heavy lifting or strenuous activity for 24 hours to prevent complications.