Instituto de Investigacion Biomedica de Malaga-IBIMA 1 article published in JoVE Medicine Basophil Activation Test for Allergy Diagnosis Inmaculada Doña*1,2, Adriana Ariza*2, Tahia D. Fernández2,3, María J. Torres1,2,4,5 1Allergy Unit, Hospital Regional Universitario de Málaga, 2Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, 3Universidad de Málaga, Departamento de Biología celular, Genética y Fisiología, Universidad de Málaga, 4Departamento de Medicina, Universidad de Málaga, 5Nanostructures for Diagnosing and Treatment of Allergic Diseases Laboratory, Andalusian Center for Nanomedicine and Biotechnology-BIONAND The basophil activation test is a complementary in vitro diagnostic test for the evaluation of IgE-mediated allergic reactions based on the detection of basophil activation in the presence of a specific stimulus through the measure of activation markers by flow cytometry.