Table 1. Criteria for case definition of Henoch-Schönlein purpura.

Palpable purpuric eruption and at least one additional criteria are required for diagnosis.

REQUIRED CRITERION	ADDITIONAL CRITERIA
Palpable purpuric eruption	Diffuse abdominal pain
	Arthritis or arthralgia
	Renal involvement (hematuria or proteinuria)
	A biopsy showing predominant IgA deposition, mostly in the arterioles, capillaries, and venules of the skin, GI tract, or kidneys

GI—gastrointestinal.

Adapted from Dillon.²