Biomarker: F277-IgE Dill

Overview

F277-IgE Dill measures immunoglobulin E (IgE) antibodies in blood that bind to dill (Anethum graveolens) allergen extract. IgE is involved in immediate hypersensitivity reactions, including symptoms affecting the skin, gastrointestinal tract, respiratory system, or cardiovascular system. A detectable or elevated result indicates sensitization to dill, but it does not by itself establish clinical allergy or predict reaction severity. The test is clinically useful when interpreted with exposure history and symptoms to evaluate suspected IgE-mediated reactions to dill, including food-related, contact, or occupational reactions.

Clinical Use Cases

Evaluation of suspected immediate allergic reactions after eating or handling fresh or dried dill.
Assessment of possible oral allergy symptoms, urticaria, angioedema, gastrointestinal symptoms, or anaphylaxis associated with dill exposure.
Evaluation of occupational rhinitis, asthma, or contact reactions in people exposed to dill or spice dust.
Investigation of possible cross-sensitization to related Apiaceae plants, such as coriander, anise, fennel, caraway, celery, or cumin.
Supporting evidence for an allergy-focused clinical assessment when skin-prick testing is unsuitable or cannot be performed.
Monitoring sensitization in clinical research involving spice allergy.
Supporting, but not replacing, a medically supervised oral food challenge when the diagnosis remains uncertain.

Specimen Types

Serum from venous blood.
Serum from capillary blood, where validated by the testing method.
Some specific-IgE platforms may accept plasma, but specimen requirements are method-dependent.

Measurement Methods

Fluorescent enzyme immunoassay using dill allergen extract immobilized on a solid phase, such as an ImmunoCAP-type platform.
Other validated solid-phase immunoassays for allergen-specific IgE.
Enzyme-linked immunosorbent assay or related enzyme immunoassays in research settings.
Immunoblotting for research characterization of IgE-binding proteins, rather than routine clinical measurement.
Results are commonly reported as allergen-specific IgE concentration and/or an interpretive class, according to the assay manufacturer’s calibration system.

Test Preparation and Influencing Factors

No fasting or other special preparation is usually required for an allergy blood test.
Tell the healthcare professional about all medications, including antihistamines. Do not stop prescribed medicines unless specifically instructed.
The result should be interpreted with the timing, route, amount, and form of dill exposure, because reactions may differ between fresh dill, dried dill, cooked dill, and inhaled spice particles.
A positive result indicates sensitization and does not prove that eating or handling dill causes symptoms.
The numerical IgE concentration does not reliably predict reaction severity.
Cross-reactivity among related Apiaceae plants may contribute to a positive result without proving clinically relevant dill allergy.
Total IgE concentration, age, concurrent atopic disease, and assay-specific reference ranges can affect interpretation.
Sample handling requirements vary by laboratory; serum should generally be separated promptly and stored according to the validated assay protocol. Avoiding hemolysis, clot contamination, and repeated freeze-thaw cycles may improve specimen quality.
A negative result does not absolutely exclude allergy when the clinical history is strongly suggestive, particularly if the extract does not contain the relevant allergen or if the reaction is not IgE-mediated.