Generally, the platelet count of patients can rise after 24 hours of platelet transfusion, but if the treatment of primary disease is ineffective, the index may not rise even after platelet transfusion. 1. The main cause of bleeding in patients with hematological diseases is the reduction of platelet count or the existence of functional abnormalities. If the platelet count is reduced and the patient is accompanied by bleeding from various organs, timely platelet transfusion is needed. Generally, platelet count can be increased after 24 hours of platelet transfusion. 2. However, the duration of platelet transfusion in each individual is not the same, which is affected by many factors, such as repeated transfusion, infection, splenomegaly, specific diseases and so on. In addition, if the patient’s primary disease is not controlled, such as acute leukemia is not in remission, the platelet index may not rise significantly after platelet transfusion. Platelet transfusion must be performed in regular hospitals under physician monitoring to minimize the occurrence of adverse reactions such as fever during transfusion.