Biomarker: F035-IgE Potato, White

Overview

F035-IgE Potato, White measures immunoglobulin E (IgE) antibodies in blood that recognize proteins from white potato (Solanum tuberosum). IgE is an antibody involved in immediate-type allergic reactions, and potato allergens include patatin and several protease inhibitors. A detectable or elevated result indicates sensitization to potato but does not by itself confirm a clinical allergy or predict reaction severity. The test is clinically useful when interpreted with exposure history, symptoms, and, when appropriate, supervised oral food challenge testing.

Clinical Use Cases

Evaluation of suspected IgE-mediated allergy to white potato.
Investigation of immediate symptoms after eating, handling, or inhaling raw or cooked potato, including urticaria, angioedema, respiratory symptoms, or anaphylaxis.
Assessment of possible potato-related oral allergy syndrome or cross-sensitization with other foods or inhaled allergens.
Supportive testing when skin-prick testing is impractical, contraindicated, or affected by medications or skin disease.
Monitoring sensitization in selected clinical or research settings, although serial results should be interpreted with clinical findings.

Specimen Types

Venous whole blood collected for serum or plasma.
Serum is the typical specimen for allergen-specific IgE assays.

Measurement Methods

Serum allergen-specific IgE immunoassay.
Fluorescence enzyme immunoassay or equivalent solid-phase immunoassay.
Enzyme-linked immunosorbent assay (ELISA) in research settings.
Skin-prick or prick-puncture testing with potato extract as a related clinical assessment, but not a measurement of serum F035-IgE.
Oral food challenge under medical supervision when diagnostic confirmation is required, rather than as an IgE measurement.

Test Preparation and Influencing Factors

Fasting is generally not required for an isolated allergy blood test.
Patients should report prescription medicines, over-the-counter medicines, vitamins, and supplements. Antihistamines usually do not invalidate blood testing but can affect skin-prick testing; medicines should not be stopped unless directed by a healthcare professional.
Results should be interpreted with the timing, amount, and preparation of potato consumed and the patient’s symptoms.
A positive result may represent sensitization without clinically significant allergy, and false-positive results can occur.
The concentration of potato-specific IgE does not reliably predict reaction severity.
Assay platforms, allergen extract composition, reporting units, and positivity thresholds may differ between laboratories.
Total IgE elevation, atopic dermatitis, and sensitization to cross-reactive allergens may complicate interpretation.
Recent avoidance of potato does not necessarily eliminate detectable specific IgE.
A negative result reduces the likelihood of IgE-mediated allergy but does not replace clinical assessment when the history is strongly suggestive.