Biomarker: E217-IgE Ferrett Epithelium

Overview

E217-IgE Ferret Epithelium measures serum IgE antibodies specific to ferret epithelial allergens, including proteins associated with ferret skin, hair, and secretions. IgE binds to mast cells and basophils and can trigger release of inflammatory mediators after allergen exposure. A detectable or elevated result indicates sensitization to ferret allergens, but it does not by itself establish symptomatic allergy or predict reaction severity. The test is clinically useful when evaluating suspected ferret-associated allergic rhinitis, asthma, conjunctivitis, dermatitis, or other immediate hypersensitivity reactions, particularly when skin testing is unsuitable.

Clinical Use Cases

Supporting evaluation of suspected ferret allergy.
Identifying ferret epithelium as a possible trigger of allergic rhinitis, asthma, conjunctivitis, dermatitis, or other immediate hypersensitivity symptoms.
Assessing allergen sensitization when skin testing is contraindicated, inconclusive, or impractical.
Complementing exposure history, physical examination, and other allergy testing.
Supporting research into human allergic responses to ferret-derived allergens.

Specimen Types

Serum collected by venipuncture.
Serum collected in a serum gel or plain red-top tube is typically suitable.

Measurement Methods

Fluorescence enzyme immunoassay using allergen-coated solid-phase particles, such as an ImmunoCAP-based assay.
Enzyme immunoassay or other validated quantitative allergen-specific IgE immunoassay.
Results are commonly reported in kU/L, with laboratory-specific interpretive classes.

Test Preparation and Influencing Factors

Fasting is generally not required for serum allergen-specific IgE testing.
Patients should report all medications and supplements to the healthcare professional.
Antihistamines generally do not prevent measurement of serum-specific IgE, although they can affect skin-prick testing. Medication changes should follow clinician instructions.
The result should be interpreted with the patient’s exposure history and symptoms because sensitization may occur without clinically significant allergy.
Markedly elevated total IgE may contribute to nonspecific binding and possible false-positive results.
Assay results and reference categories may vary between laboratories.
Recent or ongoing allergen immunotherapy may make specific IgE results less useful for determining current clinical sensitivity.