Biomarker: E078-IgE Budgerigar Feather

Overview

E078-IgE Budgerigar Feather measures serum immunoglobulin E (IgE) antibodies directed against allergenic proteins from budgerigar feathers. Sensitization may be associated with immediate-type allergic conditions such as allergic rhinitis, conjunctivitis, and asthma after exposure to budgerigars or feather dust. A positive result indicates immunologic sensitization, but it does not by itself establish symptomatic allergy or predict reaction severity; results must be interpreted with exposure history and clinical findings. The test can help identify budgerigar feather exposure as a potential trigger in patients with compatible respiratory or allergic symptoms.

Clinical Use Cases

Supporting evaluation of suspected budgerigar-associated allergic rhinitis, conjunctivitis, or asthma.
Identifying sensitization in people with occupational, household, or recreational exposure to budgerigars.
Helping distinguish budgerigar feather sensitization from other suspected inhalant allergens.
Supporting assessment of bird-fancier respiratory allergy when interpreted with pulmonary and exposure findings.
Investigating possible cross-reactive sensitization to other bird-derived allergens, when clinically relevant.

Specimen Types

Venous blood.
Serum separated from whole blood.

Measurement Methods

Automated allergen-specific IgE immunoassay, commonly using a solid-phase allergen extract.
Fluorescent enzyme immunoassay or related enzyme-based immunoassay.
Radioallergosorbent testing, or RAST, in older studies.
Immunoblotting and related research methods for characterizing IgE-binding feather proteins.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergen-specific IgE blood test.
No special specimen preparation is typically required, although local laboratory instructions should be followed.
Tell the healthcare provider about all medications and supplements. Do not stop prescribed medicines unless instructed.
Antihistamines generally do not prevent blood-based IgE measurement, but they may affect skin allergy testing.
Recent or ongoing exposure to budgerigars may influence the clinical relevance of the result, but a positive test does not confirm that exposure causes symptoms.
Total IgE concentration, assay characteristics, cross-reactive proteins, and nonspecific binding can affect interpretation.
A negative result does not completely exclude allergy, and the concentration of specific IgE does not reliably indicate symptom severity.
Feather extracts may contain allergens shared with other bird species or bird-derived materials, which can contribute to cross-reactivity.