Blood cell cluster differentiation antigen CD is a special marker on the surface of cells that can be recognized by immune cells, and its essence is protein, which is mainly used for detecting immune system-related diseases, such as tumors and blood diseases. During the process of blood cell differentiation and maturation, different types of cells can differentiate different types of differentiation antigens at different developmental stages, and the immune cells of the organism can specifically recognize the differentiation antigens on the surface of these cells. In immune system-related diseases, such as tumors and hematological diseases, the types of blood cell cluster differentiation antigen CD vary, which is an important basis for disease diagnosis. Blood cell cluster differentiation antigen CD provides an important basis for the diagnosis of clinical diseases. If there is any abnormality, it is recommended to consult the doctor immediately for early treatment.