Biomarker: F011-IgE Buckweat

Overview

F011-IgE Buckwheat measures buckwheat-specific immunoglobulin E (IgE) antibodies in the blood. IgE is involved in immediate-type allergic reactions, including reactions that may cause hives, gastrointestinal symptoms, breathing difficulty, or anaphylaxis. A high result indicates sensitization to buckwheat but does not by itself confirm a clinical allergy or predict reaction severity; a low or negative result reduces but does not completely eliminate the possibility of allergy. The test is clinically useful when interpreted with the patient’s reaction history and, when necessary, skin testing or a supervised oral food challenge.

Clinical Use Cases

Evaluation of suspected IgE-mediated buckwheat allergy.
Assessment of patients with symptoms occurring after buckwheat exposure.
Support for allergy evaluation when skin testing is unsuitable or may be affected by medications or skin disease.
Identification of buckwheat sensitization during clinical allergy research.
Monitoring sensitization over time when interpreted alongside symptoms and specialist assessment.
Supporting component-resolved diagnosis research involving buckwheat allergens such as Fag e 1, Fag e 2, Fag e 4, and Fag e 5.

Specimen Types

Venous blood, typically serum.
Plasma may be accepted by some laboratory methods, depending on the assay protocol.

Measurement Methods

Allergen-specific serum IgE immunoassay.
Fluorescence enzyme immunoassay or other solid-phase immunoassays.
Enzyme-linked immunosorbent assay (ELISA), mainly in research and specialized testing.
Immunoblotting, primarily for research characterization of IgE-binding buckwheat proteins.
Skin-prick testing is a related clinical assessment but does not measure serum F011-IgE.

Test Preparation and Influencing Factors

Fasting is generally not required for a specific IgE blood test.
Antihistamines usually do not interfere with the blood assay, although they may affect skin-prick testing. Medication changes should follow clinician instructions.
Total IgE elevation, smoking, parasitic infection, and cross-reactive allergens may contribute to misleading or false-positive results.
A positive result indicates sensitization and must be interpreted with symptoms and clinical history.
The measured IgE concentration does not reliably predict the severity of a future allergic reaction.
Recent exposure to buckwheat is not generally required before blood collection.
Assay calibration, reporting units, and decision thresholds may differ between testing systems.
A supervised oral food challenge may be needed to confirm or exclude clinically relevant allergy; it should not be attempted without appropriate medical supervision.