Eosinophil count in cerebrospinal fluid (CSF) by probe-based method

Why Might This Test Be Ordered?

Your healthcare provider may recommend this test if you have symptoms like persistent headaches, neurological issues, or signs of inflammation/infection in the central nervous system. It could also be part of a broader evaluation for conditions such as meningitis, encephalitis, or certain autoimmune disorders.

What Does the Result Mean?

Elevated eosinophil counts in CSF may suggest conditions like eosinophilic meningitis, parasitic infections, or certain allergic reactions affecting the nervous system. Lower-than-expected levels might raise concerns about other underlying issues, so results are interpreted in context with your symptoms and medical history.

Sample Collection and Preparation

A small amount of CSF is collected via a lumbar puncture (spinal tap) under sterile conditions. The sample is then analyzed using a specialized probe method to count eosinophils. This procedure is typically done in a hospital setting with medical supervision.

What to Expect Before the Test

You may be asked to fast or avoid certain medications before the test, depending on your provider’s instructions. Inform your doctor about any medications, allergies, or recent illnesses, as they may affect the test results or procedure.