Etiologic classification 病因分类 Inadequate production of rbc and HB 红细胞和血红蛋白生成不足 Deficiency of hematopoietic factors: folic acid, Bu and iron deficiency 造血因子缺乏:叶酸、B19,铁缺乏 回复旦大学上海医学院儿科学系Etiologic classification 病 因 分 类 • Inadequate production of RBC and HB • 红细胞和血红蛋白生成不足  Deficiency of hematopoietic factors：folic acid,B12 and iron deficiency 造血因子缺乏： 叶酸、B12，铁缺乏