There are often patients consulting on the issue of thrombocytosis, and there are often doctors telling patients that thrombocytosis will form blood clots, and patients are frightened, today we will talk about those things that thrombocytosis. A. What is the normal platelet value for adults? (100-300) × 109 / L Second, how many platelets is thrombocytosis? Platelets >450×109/L can be diagnosed as thrombocythemia. In general, platelets >1000×109/L have an increased risk of thrombosis. Third, does thrombocytosis necessarily lead to thrombosis? A large number of surveys found that 99 cases out of 10,000 respondents had a platelet count >400×109/L at the first examination, and only 8 cases showed persistent thrombocytosis at the 8-month reexamination. Therefore, repeated testing of platelet count is very important for the diagnosis of thrombocytosis. IV. What are the types of thrombocytosis? 1. Pseudo thrombocythemia Platelet-like substances in the blood can be mistaken for platelets by the automatic blood counters. 2. Reactive thrombocytosis Acute infection, inflammatory reaction, tissue injury, hyposplenism, post-splenectomy, iron-deficient malignancy, hemolysis, etc. 3.Primary thrombocytosis This is relatively more serious. The diagnosis can be confirmed by platelet function testing and genetic analysis. The risk of thrombocytosis and bleeding is present in thrombocytosis, and thrombotic complications are the main cause of morbidity and mortality. 1, secondary thrombocytosis rarely causes thrombosis, the incidence is only 1.6%, and its prognosis depends on the primary disease, and no special treatment is generally needed for thrombocytosis. 2.Primary thrombocythemia requires active treatment