再生障碍性贫血(AA,简称再障),是一组由化学、物理、生物因素及不明原因引起骨髓造血干细胞损伤,造血微环境损伤免疫机制异常,导致红骨髓总容量减少代以脂肪髓,造血机能衰竭而引起的全血细胞减少为主的综合征。其主要的临床表现为贫血及贫血的伴随症状,血小板减少而引起的出血倾象和白细胞减少而引起的感染症状。根据起病缓急、病情轻重、骨髓的损伤程度和转归因素,将 Aplastic anemia (AA) is a group of bone marrow hematopoietic stem cell injury caused by chemical, physical, biological factors and unexplained causes, abnormal immune mechanisms of hematopoietic microenvironment damage, leading to the reduction of total capacity of red bone marrow to replace fat marrow, Hematopoietic failure caused by pancytopenia-based syndrome. The main clinical manifestations of anemia and anemia associated with symptoms of thrombocytopenia caused by hemorrhage and leukopenia caused by the symptoms of infection. According to the onset of urgency, severity, bone marrow damage and prognosis factors will be