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Summary Measurements of platelet production in 16 patients with idiopathic thrombocytopenic purpura (ITP) demonstrate that megakaryocytopoiesis (total thrombopoiesis) and platelet turnover (effective thrombopoiesis) are increased in parallel to as much as 8 times normal. The marrow megakaryocytes show changes characteristic of stimulated thrombopoiesis.