Eosinophil count in cerebrospinal fluid (manual differential count)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like severe headaches, neck stiffness, confusion, or neurological problems that suggest an infection, inflammation, or other condition affecting the brain or spinal cord. It could also be used to monitor certain treatments or conditions like meningitis, encephalitis, or parasitic infections.

What to Expect Before the Test

You’ll likely have a lumbar puncture (spinal tap) to collect the CSF. This involves lying on your side and having a needle inserted into your lower back to draw a small sample. You may feel pressure or discomfort, but it’s usually brief. Rest assured, the procedure is done under sterile conditions to ensure safety.

What the Results Mean

Elevated eosinophil counts in CSF can indicate conditions such as parasitic infections (e.g., neurocysticercosis), certain types of meningitis, or allergic reactions affecting the nervous system. Lower-than-expected counts might suggest normalcy or other underlying issues like autoimmune disorders. Your results will be interpreted by a healthcare provider based on your full medical history and symptoms.

Common Conditions Monitored

This test is particularly useful for diagnosing or managing conditions like parasitic infections in the nervous system, eosinophilic meningitis, or other rare inflammatory or infectious processes in the CSF.