Naegleria fowleri Antigen in Cerebrospinal Fluid (CSF) by Immunoassay

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms such as sudden high fever, severe headache, stiff neck, confusion, seizures, or hallucinations—especially if you’ve been in a warm freshwater environment recently. It’s also used in suspected cases of PAM, particularly in travelers or individuals with risk factors like swimming or diving in contaminated water.

What to Expect Before the Test

A small amount of CSF is collected through a procedure called a lumbar puncture (spinal tap). You’ll lie on your side, and the provider will insert a needle into your lower back to draw fluid. You may feel pressure or discomfort, but it’s usually brief. The test itself involves analyzing the fluid for the *Naegleria fowleri* antigen using an immunoassay method.

What the Results Mean

A positive result confirms the presence of *Naegleria fowleri* antigen in your CSF, strongly suggesting PAM. A negative result means the test did not detect the antigen, but other causes of symptoms (like bacterial meningitis) could still be present. Follow-up tests or treatments may be needed based on your symptoms and clinical picture.

Possible Treatments and Next Steps

If PAM is confirmed, treatment typically involves strong antibiotics (like miltefosine or amphotericin B) and supportive care. Early treatment is crucial to prevent severe brain damage or death. Your provider will work with you to develop a personalized treatment plan based on your symptoms and lab results.