The trombocytosis

Abstract

The thrombocytosis is defined as a number of platelets higher than 450×10⁹/l. The exploration of thrombocytosis implies diagnosis reasoning in two phases : the first consists in eliminating the reactive causes, the familial thrombocytosis and the myelodysplastic syndromes. The second step consists in recognizing in a primitive myeloproliferative syndrome, what is specific to the essential thrombocythemia. The primitive thrombocytosis are associated with haemostatic complications, hence the significance of stratifying the vascular risk in order to guide the therapeutic attitude.