The high specificity of BAT confers its greatest advantage compared with tests that are currently used in clinical practice, such as SPT and specific IgE.4, 59 For the foods where component testing offers added value compared to using whole allergen extracts, enhanced specificity can be obtained with specific IgE to component allergens; however, cases remain where specific IgE to individual components is not enough to reach a clear definitive diagnosis of food allergy. This evidence concerns the gene IGHE and food allergy.