Lymphocyte count in cerebrospinal fluid (CSF)

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like headaches, neck stiffness, fever, or neurological issues that could suggest an infection, inflammation, or other condition affecting the central nervous system. It might also be used to monitor treatment progress for conditions such as meningitis, multiple sclerosis, or certain cancers.

What to Expect Before the Test

You’ll typically have a small needle inserted into your lower back to collect a sample of spinal fluid. The procedure is usually quick and may cause mild discomfort, but you’ll be given local anesthesia to numb the area.

What the Test Results Mean

The results show the count of lymphocytes (a type of white blood cell) in the fluid. Elevated levels may indicate an infection, inflammation, or other immune-related conditions. Lower-than-expected levels might suggest certain neurological disorders or immune deficiencies.

Common Conditions Monitored

This test helps diagnose or track conditions like meningitis, encephalitis, multiple sclerosis, lymphoma, or other immune-related diseases affecting the central nervous system.