Title: Evaluation of Basophil Activation Tests to Diagnose Tolerance to Food Allergens Erik N. Newman, MDa,b, Patricia Merkel, MSc, Leah Huey, BSc, Maureen Bauer, MDc, Matthew Greenhawt, MD, MBA, MScc, Vijaya Knight MD, PhDcaDepartment of Dermatology, University of Utah School of MedicinebDivision of Allergy & Immunology, Department of Pediatrics, University of Utah School of MedicinecDepartment of Pediatrics, Section of Allergy and Immunology, Children’s Hospital Colorado, University of Colorado School of MedicineSource of Funding: University of Colorado Department of Pediatrics and Children’s Hospital Colorado Research InstituteDisclosure: Matthew Greenhawt is supported by grant #5K08HS024599-02 from the Agency for Healthcare Research and Quality; is an expert panel and coordinating committee member of the NIAID-sponsored Guidelines for Peanut Allergy Prevention; has served as a consultant for the Canadian Transportation Agency, Thermo Fisher, Intrommune, and Aimmune Therapeutics; is a member of physician/medical advisory boards for Aimmune Therapeutics, DBV Technologies, Sanofi/Genzyme, Genentech, GlaxoSmith Kline, Merck, Nutricia, Kaleo Pharmaceutical, Nestle, Aquestive, Allergy Therapeutics, AllerGenis, Aravax, and Monsanto; is a member of the scientific advisory council for the National Peanut Board; has received honorarium for lectures from Thermo Fisher, Aimmune Therapeutics, DBV Technologies, Before Brands, multiple state allergy societies, the American College of Allergy Asthma and Immunology, the European Academy of Allergy and Clinical Immunology; is an associate editor for the Annals of Allergy, Asthma, and Immunology; and is a member of the Joint Taskforce on Allergy PracticeWORD COUNT: 1149Key words: basophil activation test, food allergy, diagnostic testing