Biomarker: F087-IgE Melon

Overview

F087-IgE Melon measures serum immunoglobulin E (IgE) antibodies that bind to melon allergens, generally from Cucumis melo. IgE is involved in immediate-type allergic reactions, and melon allergens include profilin, also known as Cuc m 2, as well as other identified allergenic proteins. A detectable or elevated result indicates sensitization to melon but does not by itself prove clinical allergy or predict reaction severity. The test is clinically useful when interpreted with the patient’s history and, when appropriate, skin testing or a supervised oral food challenge.

Clinical Use Cases

Evaluation of suspected IgE-mediated melon allergy after symptoms such as oral itching, hives, gastrointestinal symptoms, wheezing, or respiratory symptoms.
Assessment of possible pollen-food allergy syndrome involving melon, particularly in patients with pollen allergy.
Investigation of cross-sensitization involving related plant foods, pollens, or latex, although a positive result does not establish clinical cross-reactivity.
Supporting allergy evaluation when skin testing is unsuitable because of skin disease, medication interference, or concern about a reaction during testing.
Research on melon allergens, including IgE recognition of Cuc m 2 and other melon proteins.

Specimen Types

Venous blood, processed to obtain serum.
Serum is the typical specimen for laboratory measurement of melon-specific IgE.

Measurement Methods

In-vitro allergen-specific IgE immunoassays using melon extract or standardized melon allergen preparations.
Enzyme-linked immunosorbent assay (ELISA), primarily described in human research studies.
Immunoblotting and inhibition assays for research characterization of IgE-binding melon proteins and cross-reactivity.
Skin-prick or prick-by-prick testing may be used as complementary clinical tests, but these are not measurements of serum F087-IgE.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergy blood test.
Tell the healthcare provider about all medications and supplements. Antihistamines may affect some allergy tests, but medications should not be stopped unless specifically instructed.
Results should be interpreted with the timing, type, and reproducibility of symptoms after melon exposure.
A positive specific-IgE result indicates sensitization and may occur without clinically relevant symptoms.
The concentration of melon-specific IgE does not reliably predict the severity of a future reaction.
Total IgE, smoking, and parasitic infection may influence overall IgE levels but do not specifically establish melon allergy.
Pollen sensitization may contribute to cross-reactive IgE responses to melon profilin and can complicate interpretation.
Oral food challenges, when clinically appropriate, should be performed only under medical supervision because they can provoke allergic reactions.

Synonyms

Melon-specific IgE
Melon allergen-specific IgE
Anti-melon IgE
Cucumis melo-specific IgE
F087 melon IgE
f87 melon
Melon allergy blood test
Melon RAST
Melon ImmunoCAP-specific IgE
Cuc m 2-related IgE, when referring specifically to IgE against the melon profilin allergen