Biomarker: F095-IgE Peach

Overview

F095-IgE Peach measures peach-specific immunoglobulin E (sIgE) antibodies in blood, indicating immune sensitization to peach proteins. A high result may support peach sensitization, while a low or undetectable result makes IgE-mediated peach allergy less likely but does not fully exclude it. Peach-specific IgE does not independently confirm clinical allergy or predict reaction severity, so results should be interpreted with the patient’s history and, when appropriate, supervised food-challenge testing. Peach allergy may involve several allergen components, including Pru p 1, Pru p 3, Pru p 4, and Pru p 7; component patterns may provide additional information about localized versus systemic reactions in selected populations.

Clinical Use Cases

Assess sensitization to peach in patients with symptoms occurring after peach exposure.
Support evaluation of suspected IgE-mediated peach allergy alongside clinical history and physical examination.
Help investigate reactions such as oral itching, urticaria, angioedema, gastrointestinal symptoms, respiratory symptoms, or anaphylaxis.
Support evaluation of possible cross-reactivity with related plant foods or pollens.
Monitor sensitization during clinical follow-up when interpreted with symptoms and other allergy assessments.
Help select patients who may require component-resolved testing or a medically supervised oral food challenge.

Specimen Types

Venous blood, typically collected as serum.
Plasma may be accepted by some assay systems, according to the laboratory’s validated requirements.

Measurement Methods

Quantitative serum allergen-specific IgE immunoassay.
Fluorescence enzyme immunoassay or other automated solid-phase immunoassays.
Enzyme-linked immunosorbent assay methods, primarily in research settings.
Component-resolved diagnostics measuring IgE to peach allergens such as Pru p 1, Pru p 3, Pru p 4, or Pru p 7.

Test Preparation and Influencing Factors

Fasting is generally not required for a serum peach-specific IgE test.
Tell the healthcare professional about all medications and supplements. Do not stop medications, including antihistamines, unless instructed.
Results should be interpreted with the timing, amount, and form of peach consumed and the symptoms that followed.
A positive result indicates sensitization and does not by itself establish clinical peach allergy.
The measured IgE concentration does not reliably predict reaction severity.
Cross-reactive antibodies to related foods, pollens, or carbohydrate structures may contribute to positive results without clinically relevant peach allergy.
Assay platforms, reporting units, reference categories, and detection limits vary between laboratories. Results should be interpreted using the reporting laboratory’s reference information.
Skin-prick testing, component testing, or a supervised oral food challenge may be considered when the clinical history and serum result do not agree.