IGHE and allergic bronchopulmonary aspergillosis: The diagnosis algorithm proposed by the ISHAM Working Group is to perform an Aspergillus skin test and/or A. fumigatus specific IgE levels (the latter one being more sensitive) and if either is positive other tests for ABPA (CT scan, IgG specific to A. fumigatus, serum precipitins to A. fumigatus and total eosinophil count) should then be performed to establish the diagnosis of ABPA.