Biomarker: F232-IgE Ovalbumin

Overview

F232-IgE Ovalbumin measures serum immunoglobulin E (IgE) antibodies directed against ovalbumin, the major hen’s egg-white protein also known as Gal d 2. Ovalbumin-specific IgE indicates immunologic sensitization to this egg component, but a positive result does not by itself confirm clinical egg allergy or predict reaction severity. Because ovalbumin is relatively heat-labile, sensitization may be more relevant to reactions involving raw or lightly cooked egg than extensively heated egg, although individual responses vary. The test may support evaluation of suspected IgE-mediated egg allergy and component-resolved assessment alongside clinical history and, when necessary, a supervised oral food challenge.

Clinical Use Cases

Supporting evaluation of suspected IgE-mediated hen’s egg allergy.
Identifying sensitization to an individual egg-white component as part of component-resolved diagnostics.
Complementing clinical history, egg-white-specific IgE testing, and skin-prick testing.
Contributing to assessment of possible tolerance to different forms of egg, such as raw, lightly cooked, or extensively heated egg.
Monitoring changes in egg-component-specific IgE during follow-up, although results should not be used alone to determine whether allergy has resolved.
Supporting research on clinical phenotypes and immune responses in egg allergy.

Specimen Types

Serum from venous blood.
Plasma may be accepted by some analytical systems, depending on laboratory validation.
Skin-prick testing with ovalbumin-containing allergen extract is a related in-vivo assessment, but it does not measure serum F232-IgE.

Measurement Methods

In-vitro quantitative allergen-specific IgE immunoassay.
Fluorescence enzyme immunoassay or other solid-phase immunoassay using purified or recombinant ovalbumin.
Multiplex allergen microarray or component-resolved diagnostic platforms in research or specialized settings.
Results are commonly reported in (kU_A/L) or equivalent allergen-specific IgE units, with interpretation based on the assay and clinical context.

Test Preparation and Influencing Factors

Fasting is generally not required for a serum-specific IgE blood test.
Patients should follow the ordering clinician’s instructions regarding medications and supplements. Antihistamines usually do not affect serum-specific IgE measurements, but they can affect skin-prick test results.
Do not stop prescription or over-the-counter medicines without medical advice.
Recent exposure to egg is not usually required before blood collection, and patients should not deliberately consume egg to prepare for testing.
Total IgE concentration, age, atopic dermatitis, and other allergic conditions may influence interpretation.
Cross-reactive sensitization to related allergens may contribute to a positive result without clinically relevant reactions to egg.
A positive result indicates sensitization and does not establish food allergy, determine reaction severity, or identify a safe amount of egg.
A negative or low result does not completely exclude clinical reactivity.
Results should be interpreted with the patient’s reaction history, physical findings, other allergy tests, and, when appropriate, a medically supervised oral food challenge.