The primary goal in transfusion medicine is to promote high standards of quality in all aspects of transfusion, including production, management, and transfusion of blood components. To achieve this goal, a transfusion service quality management system should be established. Such a system should include several organizational structures, responsibilities, policies, processes, procedures, and resources with provided specifications and regulations. In this review, we summarize the current knowledge and practices regarding the quality management of hematology tests applied to the donor selection and production of blood components, including red blood cells, platelets, fresh frozen plasma, and cryoprecipitates in the field at blood centers. (Korean J Blood Transfus 2017;28:13-27 Background count는 신호잡음을 나타낸다. 이는 간섭 요인으로 인해 유발되는 것으로 생각되고 있다.14) 예를 들어 Sysmex사의 XN modular sys-