Biomarker: F020-IgE Almond
Overview
F020-IgE Almond measures serum immunoglobulin E (IgE) antibodies directed against almond allergens. IgE is involved in immediate-type allergic reactions, and sensitization indicates that the immune system recognizes proteins in almond. A detectable or elevated result may support almond sensitization, but it does not by itself confirm clinical allergy or predict reaction severity. The test is clinically useful when interpreted with the patient’s history, other allergy testing, and, when appropriate, a medically supervised oral food challenge.
Clinical Use Cases
- Evaluation of suspected IgE-mediated almond allergy.
- Identification of almond sensitization in patients with a history of immediate symptoms after almond exposure.
- Support for differential assessment of reactions to tree nuts and other foods.
- Selection of allergens for targeted testing based on clinical history.
- Research evaluation of almond-specific IgE responses and their relationship to oral food challenge outcomes.
- Assessment of sensitization to individual almond components, such as Pru du 6, when component-resolved testing is available.
Specimen Types
- Venous serum is the usual specimen for quantitative almond-specific IgE testing.
- Plasma may be accepted by some laboratory methods, subject to the method-specific requirements.
- Whole blood is generally collected for serum or plasma separation rather than analyzed directly.
Measurement Methods
- Immunoassay for serum allergen-specific IgE.
- Fluorescence enzyme immunoassay or other solid-phase immunoassay methods.
- Enzyme-linked immunosorbent assay methods in research settings.
- Component-resolved immunoassays for IgE against individual almond proteins, including Pru du 6.
- Skin-prick testing is a related clinical method for assessing almond sensitization, but it does not measure F020-IgE in serum.
Test Preparation and Influencing Factors
- Fasting is generally not required for a serum-specific IgE test.
- Do not stop prescription or over-the-counter medications unless instructed by a healthcare professional. Unlike skin-prick testing, many medications that affect skin reactivity do not interfere substantially with serum IgE measurement.
- Results should be interpreted with the timing, amount, and form of almond exposure and the symptoms reported.
- Total IgE, age, atopic conditions, and cross-reactive sensitization to other nuts or pollens may affect interpretation.
- A positive result indicates sensitization and does not establish symptomatic food allergy.
- A negative result does not completely exclude allergy, particularly when relevant almond allergens are not adequately represented in the test extract or when the clinical history is strongly suggestive.
- Almond-specific IgE concentration does not reliably predict the severity of a future reaction.
- Oral food challenges should be performed only under appropriate medical supervision because they can cause allergic reactions.
Synonyms
- Almond-specific IgE
- Almond allergen-specific IgE
- Serum IgE to almond
- Specific IgE to almond
- Almond IgE antibody
- F020 almond IgE
- f20 almond-specific IgE
- Almond sensitization test
- Pru du 6-specific IgE, when testing the almond component amandin rather than whole-almond extract
This information is provided for general educational purposes and is not medical advice. Biomarker information may describe testing methods, measurements, or interpretations that vary by laboratory or specific test. For details about a particular lab test, including biomarkers measured, specimen type, collection requirements, preparation, and turnaround time, please refer to the individual test description. Talk with a licensed health care provider about your results.
