Biomarker: F001-IgE Egg White

Overview

F001-IgE Egg White measures serum immunoglobulin E (IgE) antibodies specific to egg-white proteins. IgE is an antibody involved in immediate allergic reactions. An elevated result indicates sensitization to egg white, but does not by itself confirm clinical egg allergy or predict reaction severity; interpretation requires the patient’s history and, when appropriate, a medically supervised oral food challenge. The test is clinically useful when evaluating suspected IgE-mediated reactions to egg and when assessing changes in sensitization during follow-up.

Clinical Use Cases

Evaluation of suspected IgE-mediated egg allergy when symptoms occur after eating egg or egg-containing foods.
Supporting assessment of egg sensitization alongside a compatible clinical history and physical examination.
Monitoring egg-specific IgE levels during follow-up, including evaluation of possible development of tolerance in children.
Supporting decisions about whether a supervised oral food challenge may be appropriate.
Complementing testing to egg components, such as ovomucoid and ovalbumin, when evaluating reactions to raw, cooked, or baked egg.
Research on the relationship between egg-white-specific IgE concentrations and clinical reactivity.

Specimen Types

Venous serum, typically collected from blood drawn from a vein in the arm.
Plasma may be accepted by some laboratory methods, depending on the assay.

Measurement Methods

In-vitro allergen-specific IgE immunoassay using purified or extract-based egg-white allergens.
Fluorescence enzyme immunoassay or other automated solid-phase immunoassays.
Immunoassays may report results in kUA/L or equivalent allergen-specific IgE units.
Component-resolved immunoassays for related egg proteins, including ovomucoid, ovalbumin, and conalbumin, may be performed separately.
Skin-prick testing is a complementary clinical test, but it does not measure serum F001-IgE.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergy blood test.
Tell the healthcare professional about all medicines and supplements. Do not stop medications unless specifically instructed.
Antihistamines can interfere with skin-prick testing, but generally do not prevent collection of a blood sample for specific IgE testing.
Results should be interpreted with the timing, reproducibility, and nature of symptoms after egg exposure.
A positive result indicates sensitization and does not necessarily indicate clinical allergy.
A low or undetectable result does not completely exclude allergy when the clinical history is strongly suggestive.
Total IgE concentration, age, assay characteristics, allergen preparation, and cross-reactive proteins can influence interpretation.
No single egg-white-specific IgE cutoff confirms or excludes egg allergy across all ages and clinical settings.
Specific IgE testing should not be used alone to predict reaction severity.
A medically supervised oral food challenge remains the most definitive method when the diagnosis is uncertain.