Biomarker: F025-IgE Tomato

Overview

F025-IgE Tomato measures immunoglobulin E (IgE) antibodies in blood that specifically bind to tomato proteins. IgE is involved in immediate allergic reactions, including oral itching, hives, gastrointestinal symptoms, respiratory symptoms, and, less commonly, anaphylaxis. A detectable or elevated result indicates sensitization to tomato but does not by itself confirm clinical tomato allergy or predict reaction severity. The test is clinically useful when interpreted with the patient’s exposure history and symptoms as part of an evaluation for suspected IgE-mediated food allergy.

Clinical Use Cases

Supports evaluation of suspected IgE-mediated tomato allergy when symptoms occur after tomato exposure.
Helps identify tomato sensitization in patients with a compatible allergy-focused history.
May support assessment of pollen-food allergy syndrome or oral allergy syndrome when tomato causes mouth or throat symptoms.
Provides an alternative to skin-prick testing when skin testing is unsuitable, including when extensive dermatitis or antihistamine use interferes with testing.
May be used with skin-prick testing and, when indicated, a supervised oral food challenge to clarify whether sensitization represents clinical allergy.

Specimen Types

Venous whole blood, with measurement performed on separated serum.
Serum is the usual specimen for laboratory measurement of tomato-specific IgE.

Measurement Methods

In vitro allergen-specific IgE immunoassay using tomato allergen extract attached to a solid phase.
Fluorescence-based or enzyme-based immunoassays, depending on the laboratory platform.
Skin-prick testing with tomato extract is a related clinical method for detecting sensitization but is not the same as the F025 serum biomarker measurement.
Oral food challenge is a clinical diagnostic procedure rather than a laboratory measurement and may be used when the history and test results are inconclusive.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergy blood test.
Tell the healthcare professional about all medications and supplements. Some medicines, particularly antihistamines, may affect allergy testing, but medications should not be stopped without clinical instructions.
Results should be interpreted with the timing, reproducibility, and characteristics of symptoms after tomato exposure.
Tomato form and preparation may matter because reactions can differ between raw, cooked, processed, peeled, or seed-containing tomato products.
A positive result indicates sensitization and does not establish clinical allergy, indicate reaction severity, or determine the amount of tomato required to cause symptoms.
Total serum IgE should not be used as a substitute for tomato-specific IgE testing or as the sole basis for diagnosing food allergy.
Testing should be targeted to foods suggested by the clinical history; indiscriminate food panels can produce clinically irrelevant positive results.
A negative or undetectable result reduces the likelihood of IgE-mediated allergy but does not completely exclude it. Further specialist assessment may be needed when the clinical history is strongly suggestive.