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在医院体检的时候，抽血都是必不可少的步骤，有时候还需要抽好几管子，这个时候，有些人可能会担心，这一管接着一管的抽血会不会导致贫血？答案是：不会。贫血是有一定标准的。贫血是因为人体血液中的血红细胞容量减少，低于正常范围的一种情况。其中成年男子血红蛋白浓度＜120克/升、成年女性（非妊娠）＜110克/升、孕妇＜100克/升，就可以认定为贫血。主要表现为脸色苍白、乏力、头晕、心率加快、注意力不集中、体力耐力下降等症状，贫血越严重，症状也就越明显。我国的献血标准规定，成年人一次可献血量为200~400ml，这说明正常成年人失血量在这个范围内都是安全的。一般的血液检查，抽血量在2~20ml，这么少的失血量对人体没有影响。
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