RESUMEN
Food allergy is an adverse immune response to foods. The prevalence of food allergy vary by age, diet, and many other factors. Based on the immunological mechanism, food allergies may be classified in a IgE-mediated diseases, which are the best-characterized food allergy reactions, non-IgE-medicated diseases, and mixed type diseases. In children, the GI tract seems to be the most common target organ. Generally, IgE-mediated reactions have an acute onset, whereas non-IgE-mediated reactions have a late onset. The most food allergy with GI manifestation involve non-IgE-mediated reactions. The evaluation of a child with suspected food allergy includes medical history, physical examination, screening test and the response to elimination diet and to oral food challenge. The diagnosis of non-IgE-mediated food allergies using a screening test is difficult. In this review, investigate the diagnostic criteria and manifestations of several non-IgE-mediated allergic diseases and the diagnostic method in the field of a pediatric gastroenterology.