ITGB3 and Macrothrombocytopenia: Examples include: BSS (GP1BA, GP1BB, GP9 genes); platelet-type von Willebrand disease (GP1B1); GT (ITGA2B and ITGB3); MYH9-RD if there is macrothrombocytopenia, Döhle bodies, and/or typical extra hematologic manifestations (MYH9).