Biomarker: E070-IgE Goose Feathers

Overview

E070-IgE Goose Feathers measures serum IgE antibodies specific to goose-feather allergens. IgE is an antibody involved in immediate allergic reactions, including activation of mast cells and basophils after allergen exposure. A detectable or elevated result indicates sensitization, but it does not by itself confirm symptomatic allergy or predict reaction severity. The test is clinically useful when a patient’s history suggests respiratory, ocular, or skin symptoms related to exposure to goose feathers or feather-filled materials, particularly when skin testing is unsuitable.

Clinical Use Cases

Evaluate suspected IgE-mediated sensitization to goose feathers.
Support the assessment of allergic rhinitis, allergic conjunctivitis, asthma, or immediate skin symptoms associated with feather exposure.
Help identify possible environmental allergens when interpreted with exposure history and clinical findings.
Provide an alternative to skin-prick testing when skin disease, medication use, or a prior reaction limits skin testing.
Assess sensitization to related bird-feather allergens when cross-reactivity is clinically relevant.
Distinguish possible IgE-mediated feather allergy from other feather-associated conditions; feather-related hypersensitivity pneumonitis is generally evaluated using clinical findings and antigen-specific IgG rather than this IgE test.

Specimen Types

Serum from venous blood.
Plasma may be accepted by some validated laboratory methods, depending on the assay.
Capillary blood may be suitable for some laboratory systems.

Measurement Methods

In-vitro quantitative allergen-specific IgE immunoassay.
Fluorescent enzyme immunoassay or other solid-phase immunoassay methods.
Skin-prick testing with goose-feather extract may be used as a separate in-vivo assessment, but it does not measure serum E070-IgE.
Results are commonly reported as allergen-specific IgE concentration in standardized units, with assay-specific detection limits and interpretive classes.

Test Preparation and Influencing Factors

Fasting is generally not required for serum-specific IgE testing.
Antihistamines usually do not alter the blood concentration of allergen-specific IgE, although they can suppress skin-test responses. Medication instructions should be confirmed with the healthcare professional or testing facility.
Do not stop prescription medicines without medical advice.
Collection timing is generally not restricted, but results should be interpreted in relation to the patient’s symptoms and recent or ongoing exposure.
A positive result indicates sensitization and may occur without clinically significant symptoms; a negative result does not completely exclude allergy.
Total IgE concentration, age, immune status, assay characteristics, and the quality of the allergen extract can affect interpretation.
Cross-reactivity with related bird allergens may contribute to a positive result.
The numeric IgE concentration does not reliably predict the severity of a future reaction.