Biomarker: F041-IgE Salmon

Overview

F041-IgE Salmon measures immunoglobulin E (IgE) antibodies in the blood that recognize proteins from salmon, usually Atlantic salmon (Salmo salar). Salmon allergens include parvalbumin, particularly the allergen known as Sal s 1, as well as other proteins such as enolase and aldolase. Elevated salmon-specific IgE indicates sensitization but does not by itself confirm a clinical allergy or predict reaction severity. The test is clinically useful as part of an allergy evaluation when interpreted with the person’s symptoms, exposure history, and, when necessary, a supervised oral food challenge.

Clinical Use Cases

Supports evaluation of suspected IgE-mediated salmon or fish allergy.
Assesses sensitization to salmon after symptoms such as hives, swelling, vomiting, wheezing, or anaphylaxis following exposure.
Helps guide selection of foods for allergy testing based on the clinical history.
May be used when skin-prick testing is unsuitable, inconclusive, or cannot be performed.
Helps assess possible sensitization to specific fish species, although cross-reactivity can limit species-level interpretation.
Supports research into fish allergens, including parvalbumin and other salmon proteins.

Specimen Types

Venous blood, generally analyzed as serum or plasma.
Skin-prick testing is a separate diagnostic approach and is not a specimen type for the F041-IgE blood test.

Measurement Methods

Allergen-specific immunoassay for salmon-specific IgE, commonly reported in kUA/L or an equivalent standardized unit.
Fluorescent enzyme immunoassay or other solid-phase immunoassay platforms.
Skin-prick testing with salmon extract may be used as a complementary clinical test, but it does not measure circulating IgE.
Component-resolved testing may measure IgE to individual salmon allergens, such as Sal s 1, when available.

Test Preparation and Influencing Factors

No fasting or other special preparation is usually required for an allergy blood test.
Patients should report all medications and supplements to the healthcare professional.
Antihistamines generally do not alter blood specific-IgE results, but they can affect skin-prick testing; medications should not be stopped unless instructed by a healthcare professional.
A positive result indicates sensitization and does not necessarily establish allergy or predict reaction severity.
Total IgE elevation, atopic disease, cross-reactivity among fish allergens, and nonspecific binding may contribute to clinically irrelevant positive results.
A negative result does not completely exclude allergy when the clinical history is strongly suggestive.
Results should be interpreted with symptoms, timing of reactions, amount and form of salmon consumed, medical history, and other allergy tests.
An oral food challenge under medical supervision is the reference approach when the diagnosis remains uncertain.