Thrombocytosis in Henoch-Schönlein purpura.

The clinical and laboratory features of acute Henoch-Schönlein purpura in 18 patients are presented. Thrombocytosis was noted in 67 per cent of the patients and was significantly associated with the presence of abdominal pain and gastrointestinal bleeding. We found no correlation between increased serum IgA concentrations or elevated sedimentation rates and any of the clinical features of Henoch-Schönlein purpura.