Biomarker: F253-IgE Pine Nut, Pignoles

Overview

F253-IgE measures serum immunoglobulin E (IgE) antibodies directed against pine nut proteins. Detectable levels indicate sensitization, but they do not independently confirm clinical allergy or predict reaction severity. Pine nut allergy is an IgE-mediated food allergy that may cause symptoms ranging from oral or gastrointestinal symptoms to anaphylaxis. The test is clinically useful when interpreted with the exposure history, symptoms, physical examination, and, when necessary, skin testing or a medically supervised oral food challenge.

Clinical Use Cases

Assess suspected immediate hypersensitivity to pine nut after compatible symptoms.
Support evaluation of possible pine nut allergy in patients with reactions to foods containing pine nut.
Identify pine nut sensitization as part of a targeted evaluation for tree-nut allergy.
Help evaluate possible monosensitization or co-sensitization to pine nut and other nuts.
Support follow-up assessment when determining whether previously suspected allergy may have changed over time.
Contribute to diagnostic decisions before considering a medically supervised oral food challenge.

Specimen Types

Venous blood.
Serum separated from venous blood.

Measurement Methods

In-vitro allergen-specific IgE immunoassay using pine nut extract.
Fluorescence enzyme immunoassay or other solid-phase immunoassay platforms.
Skin-prick testing with pine nut extract is a complementary method but does not measure serum F253-IgE.
Component-resolved testing may evaluate IgE to individual pine nut proteins, such as Pin p 1, where clinically available.

Test Preparation and Influencing Factors

Fasting is generally not required for a serum-specific IgE test.
Antihistamines usually do not affect serum-specific IgE results, although they may interfere with skin-prick testing.
Do not discontinue prescribed medicines or supplements without medical guidance.
Results should be interpreted with the timing, amount, and form of pine nut exposure and the symptoms that followed.
A positive result may represent sensitization without clinical allergy, including possible cross-reactive sensitization.
A negative result does not completely exclude allergy when the clinical history is strongly suggestive.
Total IgE concentration, age, atopic disease, assay characteristics, and laboratory-specific reporting ranges may influence interpretation.
The concentration of pine nut-specific IgE does not reliably predict reaction severity.
Oral food challenges, when needed, should be performed only under appropriate medical supervision because severe reactions can occur.