Specific IgE levels as an outcome predictor in egg-allergic children

Area of Science:

• Allergy and Immunology
• Clinical Diagnostics
• Food Hypersensitivity

Background:

• Diagnosis of IgE-mediated egg allergy relies on history, IgE levels, or skin prick tests, with oral food challenge (OFC) as the gold standard.
• Previous research suggests a correlation between IgE levels and OFC outcomes in egg allergy.

Purpose of the Study:

• To determine the relationship between specific IgE levels and OFC outcomes for various egg types.
• To establish predictive IgE cut-off values for positive OFC results in egg allergy.

Main Methods:

• A retrospective review of 198 patients undergoing OFC and IgE testing.
• Patients were categorized by OFC type: baked, cooked, or raw egg.
• Specific IgE levels were analyzed against OFC outcomes and established cut-offs.

Main Results:

• Receiver-operating characteristic (ROC) curve analysis identified potential ovomucoid IgE cut-offs for cooked egg OFC.
• Specific IgE cut-offs for egg white and ovalbumin were found for raw egg OFC.
• No significant correlation was observed between IgE levels and baked egg OFC outcomes.

Conclusions:

• Specific IgE concentrations are valuable predictors for OFC outcomes in raw and cooked egg allergies.
• IgE testing aids in selecting patients for raw or cooked egg OFC.
• Oral food challenge is recommended for baked egg allergy irrespective of IgE levels.