Biomarker: F216-IgE Cabbage

Overview

F216-IgE Cabbage measures serum-specific immunoglobulin E (IgE) antibodies directed against cabbage (Brassica oleracea var. capitata). IgE is involved in immediate hypersensitivity reactions and can trigger symptoms such as hives, swelling, gastrointestinal symptoms, wheezing, or anaphylaxis when the relevant food is consumed. A high result indicates sensitization to cabbage but does not by itself confirm clinical allergy or predict reaction severity; a low or negative result reduces, but does not completely eliminate, the likelihood of IgE-mediated cabbage allergy. The test is clinically useful when interpreted with the patient’s reaction history and, when necessary, skin testing or supervised oral food challenge.

Clinical Use Cases

Evaluation of suspected immediate hypersensitivity reactions after eating cabbage.
Assessment of possible cabbage-associated urticaria, angioedema, respiratory symptoms, gastrointestinal symptoms, or anaphylaxis.
Investigation of cross-reactive plant-food or pollen sensitization, particularly involving mustard, peach, and mugwort pollen.
Supporting food-allergy evaluation when skin testing is unsuitable because of skin disease, medication use, or concern about a severe reaction.
Research involving cabbage allergy and the cabbage lipid-transfer-protein allergen Bra o 3.

Specimen Types

Venous blood.
Serum is the typical specimen for allergen-specific IgE testing.
Plasma may be accepted by some testing systems, depending on laboratory validation.

Measurement Methods

Fluorescence-based immunoassays for allergen-specific IgE.
Enzyme-linked immunosorbent assays, or ELISA.
Radioallergosorbent testing, or RAST, used in earlier clinical research and some historical references.
Skin-prick testing and supervised oral food challenge may be used as complementary clinical assessments, but they do not measure serum F216-specific IgE.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergy blood test.
Patients should report all medications, especially antihistamines and other allergy medicines. Medication changes should be made only with clinician guidance.
Antihistamines can interfere with skin-prick testing, but they generally do not prevent collection of a specific-IgE blood sample.
Results should be interpreted alongside the timing, reproducibility, and severity of symptoms after cabbage exposure.
A positive result indicates sensitization and does not establish that eating cabbage will cause symptoms.
The measured IgE concentration does not reliably predict reaction severity.
Total IgE elevation, smoking, parasitic infection, and other conditions may complicate interpretation of allergy blood-test results.
Assay platforms, reporting units, and decision thresholds may differ between laboratories.