Subjects and research methods:. Cross sectional, with 1000 patients who came to Department of Nutrition, Hospital Nhi dong 2, with suspected food allergy and had specific IgE tests, in 1/1/2020 - 31/12/2020 Results: 1/3 were negative with food IgE, 2/3 were positive with at least 1 among 5 priority food IgEs.