文档介绍：Anemiainchildhood (小儿贫血),,,pathogeny,diagnosis, hematopoieticsysteminfantileanemia(1)nutritionalirondeficiencyanemia(IDA)(2)nutritionalmegaloblasticanemiaPrimary/immunitythrombocytopeniaPurpura(ITP)Leukemiahaematogenesisofchildrenhematopoiesis--producedbloodextramedullary beforebirthandpostnatal  mesoblasthepaticmedullary3-15w6w-6ms3msEmbryostageMesoblastichaematogenesis:3wsbegin,8wsweaken,12-15wsdisappears。liver:8wsbegin,6monthsgraduallyweaken,erythroblast、、spleen:12wsbeginerythrocyte,granule,lymphocyte4、::11wsEmbryostage5、myelo-haematopoiesis:6monsHaematogenesisfunctionemphasis,makevariouskindsofbloodcells,、marrow:2、extramedullary:whenrequirementofhaemopoiesisincrease,liver、spleen、lymphadenectasis,hepatomegalyandsplenomegaly,(HB)andhematocritlevelsandashortenedsurvivalperiodofthefetalRBCscontributes tothedevelopmentofphysiologicanemia.