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The new classification criteria for antineutrophil cytoplasmic antibodies (ANCA)-associated vasculitis (AAV) have been eagerly anticipated since the publication of the provisional criteria in 20171 and thus they are quite welcomed.2 3 Limitations of the previous criteria used for these conditions include the low sensitivity of the 1990 American College of Rheumatology (ACR) classification criteria, the fact that the patient’s ANCA status had not been included, that there were no previous classification criteria for microscopic polyangiitis (MPA), and the fact that the number of criteria rather than a weighted criteria were used. Furthermore, there was lack of satisfaction among professionals about the 1990 ACR criteria and the Chapel Hill Consensus Conference (CHCC) definitions: 43% and 68% were dissatisfied with these criteria for granulomatosis with polyangiitis (GPA), and 76% and 36% for eosinophilic GPA (EGPA), respectively.4
Given these considerations, …
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Contributors All authors contributed equally to this work.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Provenance and peer review Commissioned; internally peer reviewed.