Biomarker: W018-IgE Sheep Sorrel

Overview

W018-IgE Sheep Sorrel measures serum immunoglobulin E (IgE) antibodies directed against sheep sorrel pollen, generally identified botanically as Rumex acetosella. Specific IgE indicates immune sensitization to the allergen and may be relevant to pollen-associated allergic rhinitis, conjunctivitis, or asthma. A high result may support sensitization, while a low or undetectable result makes sensitization less likely, but neither result alone confirms or excludes clinical allergy. Results are most useful when interpreted with exposure history, symptoms, physical findings, and other allergy-test results.

Clinical Use Cases

Evaluation of suspected sheep sorrel pollen allergy.
Assessment of seasonal allergic rhinitis or allergic conjunctivitis when weed-pollen exposure is a possible trigger.
Evaluation of asthma symptoms that may worsen during pollen exposure.
Identification of sensitization patterns when selecting allergens for avoidance counseling or specialist-directed immunotherapy evaluation.
Supplementation of skin-prick testing when skin testing is unsuitable, inconclusive, or affected by medications or skin disease.
Research on pollen sensitization and respiratory allergic disease.

Specimen Types

Venous blood, typically analyzed as serum.
Plasma may be accepted by some validated assay systems, depending on laboratory requirements.

Measurement Methods

In-vitro quantitative allergen-specific IgE immunoassay.
Enzyme-linked or fluorescence-based immunoassays using sheep sorrel pollen extract.
Older radioallergosorbent-test methods and related nonradioactive assay formats are historical alternatives.
Skin-prick or scratch testing may assess sheep sorrel sensitization in vivo but is a different test from serum W018-IgE measurement.

Test Preparation and Influencing Factors

Fasting is generally not required for an allergy blood test.
Patients should report prescription medicines, over-the-counter medicines, vitamins, and supplements.
Antihistamines generally do not interfere with blood-based specific-IgE testing, although they can affect skin-prick testing. Medication changes should follow the clinician’s instructions.
Total IgE concentration, age, atopic conditions, timing of exposure, and the assay’s analytical characteristics may influence interpretation.
A positive result indicates sensitization, not necessarily symptomatic allergy or the severity of a future reaction.
Cross-reactivity with related pollens or other allergens may contribute to a positive result.
Results should be interpreted using the laboratory’s reference ranges and in relation to symptoms and relevant environmental exposure.