Autoimmune Encephalopathy Antibody Profile in Cerebrospinal Fluid (CSF)

Why This Test Is Done

Your doctor may order this test if you have unexplained neurological symptoms—such as confusion, seizures, or memory problems—that don’t have obvious causes like infections or strokes. It’s often used in patients with symptoms like sudden memory loss, personality changes, or movement disorders.

What to Expect Before the Test

You’ll need a spinal tap (lumbar puncture) to collect a small amount of cerebrospinal fluid (CSF). This procedure is usually done in a hospital setting and may cause mild discomfort. You’ll be asked to lie still for a few minutes afterward.

What the Test Results Mean

Positive results for specific antibodies (e.g., anti-NMDA receptor, anti-GAD65) may indicate an autoimmune cause for your symptoms. However, many people with these antibodies don’t have symptoms, so results alone don’t confirm a diagnosis. Your doctor will consider your full medical history and other test results.

Common Symptoms Linked to This Test

Autoimmune encephalitis often presents with symptoms like confusion, hallucinations, seizures, or psychiatric changes. Some people experience movement disorders (e.g., rapid eye movements, muscle spasms), and symptoms can worsen quickly. Early diagnosis is key to managing the condition.