text: 2.骨髓外造血正常情况下，出生后骨髓外造血极少，但在某些疾病情况下，如严重感染、溶血性贫血时造血增加，并在造血增加的需求超过骨髓的代偿能力时，骨髓外造血组织恢复造血，称为“髓外造血”，临床特点为肝、脾、淋巴结因代偿性造血而增大外周血出现有核红细胞和粒细胞核左移现象黄髓很少，也即骨髓的代偿性造血储备力很少，一旦造血需要增加时，容易出现髓外代偿性造血。
entities.entity: 骨髓
entities.label: bod
entities.entity: 骨髓
entities.label: bod
entities.entity: 感染
entities.label: dis
entities.entity: 溶血性贫血
entities.label: dis
entities.entity: 骨髓
entities.label: bod
entities.entity: 骨髓外造血组织恢复造血
entities.label: sym
entities.entity: 髓外
entities.label: bod
entities.entity: 肝
entities.label: bod
entities.entity: 脾
entities.label: bod
entities.entity: 淋巴结
entities.label: bod
entities.entity: 肝、脾、淋巴结因代偿性造血而增大
entities.label: sym
entities.entity: 外周血
entities.label: bod
entities.entity: 核红细胞
entities.label: bod
entities.entity: 粒细胞
entities.label: bod
entities.entity: 外周血出现有核红细胞和粒细胞核左移现象
entities.label: sym
entities.entity: 黄髓
entities.label: bod
entities.entity: 骨髓
entities.label: bod
entities.entity: 髓外代偿性造血
entities.label: sym