Biomarker: F221-IgE Coffee

Overview

F221-IgE Coffee measures immunoglobulin E (IgE) antibodies in blood that recognize coffee allergen extracts. IgE is involved in immediate allergic reactions, including symptoms affecting the skin, respiratory tract, and gastrointestinal system. A positive result indicates sensitization to coffee proteins but does not by itself confirm clinical allergy or predict reaction severity. The test may support evaluation of suspected coffee-related allergy, particularly when skin testing is unsuitable, but results should be interpreted with the clinical history.

Clinical Use Cases

Evaluation of suspected immediate hypersensitivity reactions after consuming or handling coffee.
Assessment of possible occupational allergy in people exposed to green or roasted coffee beans.
Support for allergy evaluation when skin-prick testing is contraindicated, impractical, or potentially hazardous.
Investigation of work-related respiratory symptoms, such as rhinitis or asthma, in coffee-processing workers.
Use alongside clinical history and, when appropriate, skin-prick testing or medically supervised oral food challenge.

Specimen Types

Venous blood, typically submitted as serum.
Plasma may be accepted by some analytical systems, depending on laboratory requirements.

Measurement Methods

Allergen-specific IgE immunoassay using a coffee allergen extract.
Fluorescence-based immunoassays, including systems commonly described as ImmunoCAP-type assays.
Enzyme-linked immunosorbent assays, or ELISA.
Older radioallergosorbent tests, or RAST, used in historical clinical research.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergy blood test.
Report all medications to the healthcare professional. Antihistamines may affect some allergy assessments, although they generally do not invalidate blood-specific IgE testing; do not stop medication unless instructed.
Interpret results together with the timing, reproducibility, and severity of symptoms after coffee exposure.
A positive result indicates sensitization and may occur without symptoms after coffee consumption.
The measured IgE concentration does not predict the severity of a future allergic reaction.
Total IgE elevation, smoking, parasitic infection, and other allergic conditions may complicate interpretation of IgE results.
Coffee exposure may involve green beans, roasted beans, inhaled dust, or other beverage ingredients. The tested extract may not represent every exposure source.
Testing has limited clinical significance without a compatible history of symptoms.