Walnut-Food, IgE, with Reflex to Walnut-Food Components, IgE, Serum

Casandra

Casandra Test Code MC85918Version 1 (DRAFT)

Performing Lab

Lab Mayo Clinic LabLab Test ID BLWRFCPT Code 86003

Walnut-Food, IgE, with Reflex to Walnut-Food Components, IgE, Serum

Clinical Use

Use

This test is useful for the evaluation of patients suspected of having a walnut-food allergy. The test starts by determining the presence of total walnut-food-specific IgE antibody. If detectable total walnut-food-specific IgE antibody is found (≥0.10 kU/L), reflex testing is performed for IgE antibodies against specific walnut-food components, Jug r 1 and Jug r 3. This helps in assessing the potential strength and type of allergenic response, providing detailed information about the patient's sensitivity to specific walnut allergens. Walnut allergy can lead to severe allergic reactions, including anaphylaxis, and persistent allergies to walnut can be lifelong.

Special Instructions

Not provided.

Limitations

While positive results for IgE antibodies to walnut or specific components suggest sensitization, they are not diagnostic for walnut allergy and should be interpreted within the clinical context. IgE testing might not be helpful in individuals previously treated with immunotherapy or in whom allergy management does not depend on allergen specificity. High IgE levels can lead to false positives due to nonspecific binding. Additionally, negative results do not guarantee a lack of clinical allergy. The cross-reacting carbohydrate determinants may cause false positives.

Test Details

FDA Approved