Test Overview

Test Methodology

Indirect Immunofluorescent assay, RIA, Western blot, Cell Binding assay

Test Usage

Evaluating new onset encephalopathy (noninfectious or metabolic) comprising confusional states, psychosis, delirium, memory loss, hallucinations, movement disorders, sensory or motor complaints, seizures, dyssomnias, ataxias, nausea, vomiting, inappropriate antidiuresis, coma, dysautonomias, or hypoventilation in serum specimens

Reference Range*

By report

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed

Monday - Friday

Analytic Time

7 - 11 days

Soft Order Code


Test Updated

Update Type: Test Down or Delayed

Updated Date: 09/04/2019



Laboratory Reference

Mayo (ENS2)

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Specimen Requirements

Offsite Collection Instructions

Collect specimen in red top or SST tube. Spin and aliquot into a screw capped plastic tube. Send to Specimen processing refrigerated.


Yellow Top Tube

Normal Volume

4 mL serum

Minimum Volume

2.5 mL serum

Billing Information

Fee Codes

CPT Code

83519 x 5, 86255 x 14, 86341 If reflexes added: 84182 and/or 86255 and/or 86256

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