Table 2.

1990 Criteria for the Classification of Henoch-Schonlein Purpura (50).

Palpable purpura Slightly raised “palpable” hemorrhagic skin lesions, not related to thrombocytopenia Age at disease onset Patient 20 years or younger at onset of first symptoms Bowel angina Diffuse abdominal pain, worse after meals, or the diagnosis of bowel ischemia, usually including bloody diarrhoea Wall granulocytes on biopsy Histologic changes showing granulocytes in the walls of arterioles or venules