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Background: The diagnosis of food allergies needs to be confirmed through an oral food challenge (OFC). However, specific immunoglobulin E (sIgE) concentrations analyzed by serological tests are also helpful in determining OFC items and predicting the presence of allergic reactions. Unfortunately, there is a limit to the number of antigens that can be simultaneously evaluated at one time. The purpose of this study was to analyze the possibility of detecting sIgE antibodies against food using clues in self-reported food allergy symptoms. Methods: Medical records of 377 patients aged 3 years or younger were collected for egg white-, cow’s milk-, walnut- and soybean-sIgE sensitization, and related clinical history. Each clinical history was classified into class 1: direct-isolated intake resulting in anaphylaxis or hives with consistent clincical history; class 2a: class 1 with inconsistency; class 2b: indirect-mixed intake resulting in anaphylaxis or hives regardless of consistency; class 2c: direct/indirect-isolated/mixed intake resulting in itching without hives, vomiting, or diarrhea with consistent clincical history; or class 3: class 2c with inconsistency or asymptomatic to direct, isolated exposure. Results: The area under the curve (AUC) of class 1 for cow’s milk was 0.790, and the accuracy was 78.0%. The AUC of class 1 and 2 for egg white was better than that of class 1 (0.750), and the accuracy rate was 77.6%. The AUCs of class 1 for walnut and soybean were 0.775 and 0.662, respectively. Conclusion: In conclusion, sIgE sensitization to foods could be predicted by the combination of exposure and selfreported symptoms in children under 3 years of age.

Prediction of Food Allergens Sensitization Based on History Taking Technique in Young Children