Biomarker: E214-IgE Feathers, Finch

Overview

E214-IgE Feathers, Finch measures serum-specific immunoglobulin E (IgE) antibodies directed against allergenic proteins from finch feathers. Finch-derived allergens may be present in feathers, skin particles, serum, and droppings and can be inhaled or transferred through occupational or household exposure. A detectable or elevated result indicates sensitization and may support evaluation of allergic rhinitis, conjunctivitis, asthma, or other respiratory symptoms associated with finch exposure, but it does not by itself confirm clinical allergy or predict reaction severity. Finch-feather-specific IgE testing is clinically useful when interpreted with exposure history, symptoms, and other allergy-test findings.

Clinical Use Cases

Evaluation of suspected IgE-mediated allergy associated with finches or finch-feather exposure.
Investigation of allergic rhinitis, conjunctivitis, cough, wheezing, or asthma occurring after bird exposure.
Identification of potential occupational or household avian allergens.
Supporting assessment of bird-related respiratory disease alongside clinical history and pulmonary evaluation.
Selecting relevant allergens for further allergy evaluation or, in appropriate cases, allergen immunotherapy.
Research on sensitization and cross-reactivity among avian species.

Specimen Types

Venous blood, typically processed as serum.
Saliva has been used in research for detecting avian antibodies, but serum is the usual specimen for clinical specific-IgE testing.

Measurement Methods

Automated in-vitro allergen-specific IgE immunoassay.
Enzyme-linked immunosorbent assay, or ELISA.
Fluorescence-based immunoassay.
Older or research methods include radioallergosorbent testing, or RAST, and immunoblotting.
Skin-prick or intradermal testing may assess sensitization to bird extracts but is a separate test from serum E214-specific IgE measurement.

Test Preparation and Influencing Factors

Fasting is generally not required for a serum-specific IgE blood test.
Tell the healthcare professional about all medications, supplements, and medical conditions.
Do not discontinue antihistamines or other medications unless instructed by a healthcare professional. Medication restrictions are generally more relevant to skin testing than to blood-based specific-IgE testing.
Interpret results with documented finch exposure, timing of symptoms, examination findings, and other allergy testing.
A positive result indicates sensitization and may occur in an exposed person without symptoms.
The concentration of specific IgE does not reliably predict the severity of a future allergic reaction.
Cross-reactivity with allergens from other bird species may influence results.
Smoking, parasitic infection, and other conditions can affect total IgE or contribute to misleading allergy-test results, although they do not specifically establish finch allergy.
Results may vary according to the allergen extract and assay used; reference categories and decision thresholds are laboratory-specific.