Biomarker: F094-IgE Pear

Overview

F094-IgE Pear measures immunoglobulin E (IgE) antibodies directed against pear (Pyrus communis) allergen extract in serum. IgE participates in immediate hypersensitivity reactions by binding allergens and activating mast cells and basophils. A detectable or elevated result indicates sensitization to pear, but it does not by itself confirm symptomatic allergy or predict reaction severity. The test supports evaluation of suspected pear allergy, including pollen-food allergy syndrome, when interpreted alongside the patient’s history and, when appropriate, skin testing or supervised oral food challenge.

Clinical Use Cases

Evaluation of suspected IgE-mediated pear allergy.
Identification of pear as a possible trigger of immediate food-allergic symptoms.
Assessment of pollen-food allergy syndrome in patients with birch-pollen sensitization and oral symptoms after eating pear.
Selection of allergens for further evaluation when skin testing is unsuitable or may be affected by medications or skin disease.
Support for research on pear allergen sensitization and cross-reactivity with birch pollen and other plant foods.

Specimen Types

Venous blood serum, typically collected in a serum separator tube.
Serum is the specimen used for commercial F094 pear-specific IgE assays and for clinical research measurements.

Measurement Methods

Fluorescence enzyme immunoassay, including ImmunoCAP-based specific-IgE testing.
Other allergen-specific IgE immunoassays may be reported under names such as FEIA, RAST, CAP, or ELISA.
Research methods may include IgE immunoblotting using pear protein extracts, but this is not the routine clinical method for F094-IgE testing.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergy blood test.
Patients should report all medications, including antihistamines. Medication changes should be made only if directed by a health care professional.
Results should be interpreted with the timing and nature of symptoms, exposure history, and other allergy-test findings.
A positive result indicates sensitization and may occur without clinically relevant symptoms.
The concentration of pear-specific IgE does not reliably predict the severity of a future allergic reaction.
Cross-reactivity with related plant allergens, particularly birch-pollen Bet v 1-related proteins, may contribute to detectable pear-specific IgE and oral allergy symptoms.
Commercial pear extracts may not represent every pear allergen or allergen component equally, so a negative result does not completely exclude clinically relevant pear allergy.
Food allergy diagnosis should not be based on the blood test alone. When clinically necessary, an allergist may use skin testing or a medically supervised oral food challenge.