Biomarker: T007-IgE Oak, White

Overview

T007-IgE Oak, White measures serum-specific immunoglobulin E (IgE) antibodies directed against white oak pollen, generally associated with Quercus species. IgE is an antibody involved in immediate allergic responses to environmental allergens such as pollen. An elevated result indicates sensitization to the tested oak-pollen extract, while a low or undetectable result makes sensitization less likely. The result does not by itself confirm symptomatic allergy or predict reaction severity and should be interpreted with exposure history and clinical symptoms.

Clinical Use Cases

Supports evaluation of seasonal allergic rhinitis, conjunctivitis, asthma, or other symptoms associated with tree-pollen exposure.
Identifies sensitization to white oak pollen as part of an environmental allergy evaluation.
Helps guide allergen-avoidance counseling and selection of allergens for possible immunotherapy assessment.
Provides an alternative to skin testing when skin testing is unsuitable, unavailable, or affected by medications.
Supports clinical and research studies of oak-pollen sensitization and oak allergen components, including Que a 1.

Specimen Types

Venous whole blood, processed to obtain serum.
Serum is the usual specimen for laboratory measurement of allergen-specific IgE.

Measurement Methods

Immunoassay for allergen-specific IgE using an oak-pollen extract.
Enzyme-linked or fluorescence-based immunoassays used in contemporary specific-IgE testing.
Radioallergosorbent testing, or RAST, an older specific-IgE method.
Immunoblotting and component-resolved immunoassays in research settings for identifying IgE reactivity to individual oak allergens such as Que a 1.

Test Preparation and Influencing Factors

No fasting or other special preparation is usually required for an allergy blood test.
Patients should report all prescription medicines, over-the-counter medicines, and supplements to the healthcare professional.
Antihistamines generally do not need to be stopped for a blood specific-IgE test, although they can interfere with skin testing. Medication changes should be made only as directed by a healthcare professional.
Recent or ongoing exposure to oak pollen may affect the clinical relevance of the result, but testing does not need to be timed to the pollen season.
Results can be positive in people who are sensitized but do not develop symptoms after exposure. False-positive results are possible, so interpretation should account for symptoms and exposure history.
The measured IgE concentration does not reliably predict the severity of a future allergic reaction.
Assay platforms, allergen extracts, reporting units, and reference categories may differ between laboratories; results should be interpreted using the reporting laboratory’s ranges.