<qa>  How many autologous hematopoietic stem cell transplantations are performed annuallyIn Canada, over 1,500 autologous hematopoietic stem cell transplantations ASCT are performed annually for hematologic malignancies. It is currently standard practice to provide a prophylactic transfusion of platelets to prevent bleeding when the daily measured platelet count is less than 10 x 109L. A patient may require up to six adult platelet doses during the post-transplant period. However, the true benefit of prophylactic platelet transfusions in the ASCT setting is unclear and has been called into question by several recent studies. 