Biomarker: F220-IgE Cinnamon

Overview

F220-IgE Cinnamon measures immunoglobulin E (IgE) antibodies in blood that bind to cinnamon allergen extract. IgE is involved in immediate-type allergic reactions by activating mast cells and basophils after allergen exposure. A high result indicates sensitization to cinnamon, while a low or undetectable result makes sensitization less likely but does not independently exclude allergy. The test can support evaluation of suspected cinnamon-related reactions when interpreted with the clinical history, but it does not confirm food allergy or predict reaction severity by itself.

Clinical Use Cases

Supports evaluation of suspected immediate, IgE-mediated reactions after cinnamon exposure.
Helps identify cinnamon as a possible trigger among suspected food allergens.
Provides an alternative to skin-prick testing when skin testing is unsuitable, unavailable, or affected by medications or skin disease.
May be used with clinical history, physical examination, and, when necessary, a medically supervised oral food challenge.
May support research into sensitization patterns involving spice and food allergens.

Specimen Types

Venous blood, processed as serum.
Plasma may be accepted by some assay systems, depending on the laboratory method.

Measurement Methods

Single-allergen serum-specific IgE immunoassay using cinnamon extract bound to a solid phase.
Fluorescent enzyme immunoassay.
Enzyme-linked immunosorbent assay.
Chemiluminescent immunoassay.
Older radioallergosorbent methods may be encountered historically but are generally superseded by newer immunoassays.

Test Preparation and Influencing Factors

Fasting is generally not required for a serum-specific IgE blood test.
Patients should report all medications and supplements to the ordering clinician.
Antihistamines usually do not interfere with serum-specific IgE testing, although they can suppress skin-prick test responses.
The result should be interpreted with the timing, amount, and form of cinnamon exposure and the symptoms that followed.
Age, geographic location, atopic dermatitis, concomitant allergic disease, and total IgE levels can affect interpretation.
Different assay platforms and allergen extracts may produce results that are not directly interchangeable.
A positive result indicates sensitization, not necessarily clinically relevant allergy.
The measured IgE concentration does not reliably predict reaction severity.
Testing should be guided by a relevant clinical history rather than broad food-allergen screening, which increases the likelihood of false-positive results.
An oral food challenge under medical supervision may be required when the history and test results do not agree.