JACI: In Practice Editor-in-Chief, Michael Schatz, describes the September 2020 issue, the theme of which is “Diagnostic Methods in Allergy.” Theme topics covered include IgE testing, allergens, food allergy biomarkers, aeroallergen testing in asthma, and measuring urinary metabolites of mast cell mediators. Dr. Schatz then presents the Highlights of the Original Articles in the issue, which are on the topics of COVID-19, Allergic Bronchopulmonary Aspergillosis, Asthma, Drug Allergy, Eosinophilic Disorders, Food Allergy, Immunodeficiency, and Mast Cell Disorders. Read the issue: https://bit.ly/JAIPSept2020. Access JACI: In Practice’s entire library: https://www.jaci-inpractice.org