Platelet 75×10^9/L belongs to the range of low platelet, which needs to be alerted to platelet production disorder, increased platelet destruction, excessive platelet consumption, familial thrombocytopenia and other diseases. 1. Platelets are small pieces of cytoplasm shed by megakaryocytes in bone marrow, which have the functions of coagulation, hemostasis, and repair of broken blood vessels, etc. The normal value of platelets is (100~300) × 10^9/L. 2.Platelets 75×10^/l belong to low platelets, thrombocytopenia is common in platelet generation disorder diseases, such as aplastic anemia, acute leukemia, acute radiation sickness, etc.; platelet destruction increase disease, such as primary thrombocytopenic purpura, hypersplenism, etc.; platelet consumption excessive disease, such as disseminated intravascular coagulation, etc., familial thrombocytopenia, such as giant platelet Family history of thrombocytopenia such as giant platelet syndrome, etc. 3. Platelets 75×10^9/l can be examined by coagulation function, abdominal ultrasound, bone marrow cell examination, etc., in order to investigate the causes of low platelets. It is recommended to find low platelet and consult a doctor in time, actively investigate and treat the primary disease, and regularly review the condition to avoid delay.