Biomarker: T006-IgE Cedar, Mountain

Overview

T006-IgE Cedar, Mountain measures serum immunoglobulin E (IgE) antibodies specific to mountain cedar pollen, primarily from Juniperus ashei, also called Ashe juniper. IgE is an immune antibody involved in immediate-type allergic reactions, including seasonal allergic rhinitis and conjunctivitis. A detectable or elevated result indicates sensitization and may support mountain cedar allergy when consistent with exposure history and symptoms, but the concentration does not predict reaction severity and does not independently confirm clinical allergy. The test is clinically useful for identifying relevant pollen sensitization when evaluating seasonal respiratory or ocular allergy symptoms and when skin testing is unsuitable or affected by medications or skin conditions.

Clinical Use Cases

Evaluating suspected seasonal allergic rhinitis, allergic conjunctivitis, or asthma associated with mountain cedar pollen exposure.
Identifying mountain cedar sensitization as part of an evaluation for IgE-mediated aeroallergy.
Supporting selection of allergens for environmental avoidance counseling or allergen immunotherapy.
Providing an alternative to skin testing when antihistamines cannot be discontinued or when eczema, dermatographism, or another skin condition interferes with testing.
Monitoring allergen-specific IgE in clinical research, including studies of mountain cedar pollen allergens and immunotherapy.

Specimen Types

Venous blood serum, typically collected in a serum separator tube or red-top tube.
Skin-prick or intradermal test preparations may be used for clinical assessment of mountain cedar sensitization, but these are not specimen types for the T006 serum assay.

Measurement Methods

In vitro allergen-specific IgE immunoassay using mountain cedar allergen extract bound to a solid phase.
Enzyme immunoassay or enzyme-linked immunosorbent assay.
Fluorescent enzyme immunoassay.
Chemiluminescent immunoassay.
Older radioallergosorbent methods may be referenced historically, although current laboratories primarily use automated immunoassays.
Results are commonly reported as a quantitative IgE concentration and/or an interpretive class, depending on the assay.

Test Preparation and Influencing Factors

Fasting is generally not required for a serum-specific IgE blood test.
Antihistamines generally do not interfere with serum-specific IgE measurement, although they can suppress skin-test responses.
Patients should not stop prescription or over-the-counter medication without clinician guidance.
Results should be interpreted with the patient’s symptoms, timing of exposure, geographic exposure, and other allergy findings. A positive result indicates sensitization, not necessarily symptomatic allergy.
Total IgE elevation, atopic dermatitis, cross-reactive allergens, and assay-specific factors may reduce clinical specificity.
The season of blood collection generally does not determine whether serum-specific IgE can be detected, but symptom timing and exposure history are important for clinical interpretation.
Serum should be separated after collection and handled according to the testing laboratory’s requirements. Mountain cedar IgE testing commonly uses refrigerated or frozen serum.