Update Type: New Tests
Test Updated: 12/21/2022
Test Overview
Test Methodology

Fluorescence Enzyme Immunoassay (FEIA)

Test Usage

Evaluating patients suspected to have a condition associated with eosinophilia or hypereosinophilia. Evaluating patients with elevated peripheral blood eosinophil counts. Managing patients with elevated eosinophil-derived neurotoxin in the context of eosinophil-associated diseases

Reference Range *

<70 mcg/L: Normal
70-99 mcg/L: Borderline
> or =100 mcg/L: Elevated

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

Test Details
Days Set Up
Analytic Time

3 - 9 days

Soft Order Code
Reference Laboratory
Mayo EDN
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in an SST or red top tube. Spin and aliquot into a screw capped plastic tube within 12 hours of collection. Send to Specimen Processing refrigerated.

Special Handling

Serum cannot sit on either gel or cells for longer than 12 hours.

Normal Volume
0.5 mL serum
Minimum Volume
0.3 mL serum
Storage Temperature
Refrigerated preferred; frozen acceptable
Additional Information

Test performed by Mayo Clinic Laboratories

CPT Code
Fee Code