To ascertain the frequency of thrombocytosis in Henoch-Schonlein syndrome (HSS) a small retrospective survey was undertaken. Sixty-five per cent of the cases of HSS showed thrombocytosis, which might be related to the severity of the illness.

Summary To ascertain the frequency of thrombocytosis in Henoch—Schonlein syndrome (HSS) a small retrospective survey was undertaken. Sixty‐five per cent of the cases of HSS showed thrombocytosis, which might be related to the severity of the illness.