Aplastic anemia is a type of bone marrow failure syndrome, with patients often experiencing a decrease in all blood cells in the peripheral blood. As a result, patients typically face a higher risk of infections and bleeding.

Treatment for aplastic anemia is a long-term process, and hematopoiesis often cannot be restored quickly. Therefore, especially in severe cases of aplastic anemia, patients' blood cells remain at relatively low levels for an extended period, placing them at severe risk of infections and bleeding.

If platelets fall below 20*10^9/L, it is necessary to administer platelet transfusions to prevent severe bleeding.