Use

The Onion IgE test is useful for establishing a diagnosis of an allergy to onions by detecting specific IgE antibodies in the serum. It helps in defining the allergen responsible for eliciting allergic signs and symptoms like anaphylactic episodes. The test also aids in confirming sensitization before starting immunotherapy and investigating the specificity of allergic reactions to various allergens such as insect venom, drugs, or chemicals. However, it is not considered useful for assessing residual clinical sensitivity after immunotherapy or when allergen specificity does not impact medical management.