Biomarker: T001-IgE Maple/Box Elder

Overview

T001-IgE Maple/Box Elder measures serum allergen-specific immunoglobulin E (IgE) directed against pollen from box elder, scientifically known as Acer negundo, and closely related maple trees. IgE is an antibody involved in immediate allergic reactions, including allergic rhinitis, conjunctivitis, and asthma triggered by airborne pollen. A detectable or elevated result indicates sensitization to the tested pollen but does not by itself confirm symptomatic allergy or predict reaction severity. The test is clinically useful when interpreted with exposure history, seasonal symptoms, physical findings, and other allergy testing.

Clinical Use Cases

Supporting evaluation of seasonal allergic rhinitis, allergic conjunctivitis, or pollen-associated asthma.
Identifying sensitization to maple or box elder pollen in patients with symptoms during relevant pollen seasons.
Helping guide environmental exposure reduction and selection of allergens for allergen immunotherapy.
Providing an alternative to skin-prick testing when antihistamines cannot be discontinued, skin conditions interfere with testing, or skin testing presents safety concerns.
Evaluating multiple potential aeroallergens using an individualized serum allergy-testing panel.

Specimen Types

Venous blood collected for serum.
Capillary blood may be acceptable for some validated assays.

Measurement Methods

Fluorescent enzyme immunoassay.
Enzyme-linked immunosorbent assay.
Chemiluminescent immunoassay.
Radioallergosorbent testing, an older method largely replaced by newer immunoassays.
Results are generally reported as allergen-specific IgE concentration in kU/L or a corresponding categorical class, according to the assay used.

Test Preparation and Influencing Factors

Fasting is generally not required for serum-specific IgE testing.
Antihistamines typically do not interfere with serum-specific IgE measurement, although medication instructions may differ if skin testing is performed at the same visit.
Patients should not stop prescription medicines without guidance from their healthcare professional.
Collection timing does not usually require alignment with the pollen season, because serum-specific IgE reflects sensitization rather than current exposure.
Recent exposure to pollen may help explain symptoms but does not by itself establish that the measured IgE is clinically relevant.
Elevated total IgE, smoking, parasitic infection, and other medical factors may complicate interpretation of allergy blood tests.
A positive result indicates sensitization and must be correlated with compatible symptoms and exposure. The concentration does not reliably predict allergy severity.
Cross-reactivity among related maple and box elder pollens may contribute to a positive result without identifying the exact tree species responsible for symptoms.