Three of the following five criteria were required to meet American College of Rheumatology (ACR) classification criteria for hypersensitivity vasculitis:
- Age at disease onset older than 16 years.
- Medication at disease onset as a precipitating factor.
- Palpable purpura.
- Maculopapular rash.
- Biopsy specimen showing granulocytes around an arteriole and venule.
These criteria have a reported sensitivity of 71% and a reported specificity of 83.9% for the classification of hypersensitivity vasculitis compared with other vasculitides.
- Calabrese LH, Michel BA, Bloch DA, Arend WP, Edworthy SM, Fauci AS, et al. The American College of Rheumatology 1990 criteria for the classification of hypersensitivity vasculitis. Arthritis Rheum. 1990;33:1108-13.[Medline]
Created: May 29, 2005