Biomarker: F210-IgE Pineapple

Overview

F210-IgE Pineapple measures immunoglobulin E (IgE) antibodies in blood that react to pineapple proteins. IgE is involved in immediate-type allergic reactions, including oral allergy symptoms, hives, gastrointestinal symptoms, respiratory reactions, and, rarely, anaphylaxis. A detectable result indicates sensitization to pineapple but does not, by itself, confirm a clinical pineapple allergy or predict reaction severity. The test is clinically useful when interpreted with the patient’s exposure history and symptoms, and an oral food challenge may be needed when the diagnosis remains uncertain.

Clinical Use Cases

Supports evaluation of suspected IgE-mediated reactions after eating pineapple.
Helps assess possible pollen-food allergy syndrome involving pineapple.
Provides evidence of pineapple sensitization when combined with a compatible clinical history.
Supports differential evaluation of immediate food-related symptoms.
May be used in research investigating pineapple allergens and cross-reactive IgE responses.
Helps determine whether further specialist assessment or a medically supervised oral food challenge should be considered.

Specimen Types

Serum from venous blood.
Serum from capillary blood may be acceptable for some validated collection procedures.
Plasma may be accepted by certain assay systems, depending on the laboratory method.

Measurement Methods

In-vitro allergen-specific IgE immunoassay.
Fluorescent enzyme immunoassay.
Enzyme-linked immunosorbent assay.
Chemiluminescent immunoassay.
Immunoblot or other ligand-binding assay formats.
Component-resolved testing may separately assess pineapple allergen components such as profilin or bromelain, where clinically available. These component tests are distinct from whole-extract F210-IgE testing.

Test Preparation and Influencing Factors

No fasting is generally required for an allergy blood test.
Some medications or supplements can affect allergy testing protocols. Patients should disclose all medicines and follow the ordering clinician’s instructions.
Antihistamines generally affect skin testing more than blood-specific IgE testing, but medication instructions should be confirmed with the clinician.
Results should be interpreted with the timing, amount, and form of pineapple exposure and the symptoms that followed.
A positive result indicates sensitization, not necessarily clinical allergy.
The concentration of pineapple-specific IgE does not reliably indicate the severity of a possible reaction.
Cross-reactive responses, including reactions involving pollen-associated profilin, may produce positive results without consistent clinical reactions to pineapple.
Sample quality, including hemolysis, clotting, storage conditions, and repeated freeze-thaw cycles, can affect laboratory measurement.