IgAN is the commonest pattern of glomerulonephritis worldwide. It is diagnosed in 40% of all kidney biopsies performed in Asia, 20% of all kidney biopsies in Europe, and 10% of all kidney biopsies in the US. These rates may differ, at least in part, due to differences in public health screening and biopsy practices. In countries with active screening programmes for kidney disease, and centres with a low threshold to perform a renal biopsy, the reported incidence of IgAN is higher, as more patients with mild disease are identified.
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