Biomarker: F337-IgE Sole

Overview

F337-IgE Sole measures immunoglobulin E (IgE) antibodies in blood that react to sole fish, commonly identified as Solea solea. IgE antibodies can bind fish proteins, including parvalbumin, and activate mast cells and basophils, releasing mediators that cause immediate allergic symptoms. A high result indicates sensitization to sole but does not by itself confirm a clinical allergy or predict reaction severity. The test is clinically useful as part of an evaluation of suspected fish allergy, together with medical history and, when necessary, skin testing or a medically supervised oral food challenge.

Clinical Use Cases

Evaluating suspected immediate allergic reactions after eating sole.
Identifying sensitization to a specific fish species.
Supporting assessment of possible fish allergy when interpreted with symptoms and exposure history.
Investigating whether reactions may be limited to sole or involve multiple fish species.
Supporting decisions about further allergy evaluation, including skin testing or supervised oral food challenge.
Conducting human clinical or epidemiologic research on fish-specific IgE sensitization.

Specimen Types

Venous blood, with serum used for measurement of allergen-specific IgE.
Plasma may be accepted by some laboratory platforms, depending on the assay protocol.

Measurement Methods

Quantitative or semi-quantitative in-vitro serum-specific IgE immunoassay using a sole fish extract.
Fluorescence enzyme immunoassay or other solid-phase immunoassay platforms.
Immunoblotting or immunoassay-based research methods for characterizing IgE binding to individual sole proteins.
Skin-prick testing with sole extract is a related clinical assessment but does not measure F337-IgE in blood.

Test Preparation and Influencing Factors

No fasting or other special preparation is generally required for an allergy blood test.
Patients should report all medications, supplements, and recent allergic reactions to their healthcare provider.
Antihistamines generally do not invalidate a blood specific-IgE test, although they can interfere with skin-prick testing.
Medications should not be stopped without instructions from a healthcare professional.
Results indicate sensitization and must be interpreted with the clinical history. A positive result alone does not establish symptomatic food allergy.
The concentration of sole-specific IgE does not reliably predict reaction severity.
Cross-reactivity among fish species may produce a positive result without clinically relevant allergy to sole.
Timing of blood collection is usually not critical, but testing is commonly performed during the diagnostic evaluation after a suspected reaction.
Oral food challenges should only be performed under appropriate medical supervision because they can provoke an allergic reaction.