From: IgA vasculitis in adults: the performance of the EULAR/PRINTO/PRES classification criteria in adults
ACR classification criteria (1990) [2] | EULAR/PRINTO/PRES classification criteria (2010) [3] |
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Two of the following criteria: • age ≤ 20 years • palpable purpura • acute abdominal pain • biopsy showing granulocytes in the walls of the small arterioles or venules | • Purpura or petechiae AND • One of the following four criteria ◦ abdominal pain ◦ arthritis or arthralgia ◦ renal involvement ◦ leucocytoclastic vasculitis with predominant IgA deposits or proliferative glomerulonephritis with predominant IgA deposits |
sensitivity 87.1 %; specificity 87.7 % | sensitivity 100 %; specificity 87 % |