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12周彩超nt多少正常
更新时间: 2020-11-04 00:00:00  

12周彩超nt一般小于2.5mm为正常值。nt是通过b超来监测孩子颈部透明带的厚度,通过透明带厚度的测量,来了解孩子是否有染色体的发育。

染色体(chromosome)是真核细胞在有丝分裂或减数分裂时遗传物质存在的特定形式,是间期细胞染色质结构紧密包装的结果,是染色质的高级结构,仅在细胞分裂时才出现。染色体有种属特异性,随生物种类、细胞类型及发育阶段不同,其数量、大小和形态存在差异。

关键词: nt 多少 正常

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