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20周nt值多少为正常
更新时间: 2020-11-04 00:00:00  

NT是指胎儿的颈后透明带宽度。一般是孕12~14周检查,孕12周胎儿NT一般不超过3mm是正常的。

颈部透明带是指胎儿颈后皮下组织内液体积聚的厚度,14周前部分正常胚胎上肢淋巴可出现短暂的回流障碍,出现暂时的透明层增厚。到14周左右时,胚胎的左右淋巴管与颈静脉窦相通以后,则透明层逐渐变薄消失,颈部透明带增厚与多种胎儿先天性异常都有较密切的关系,如染色体异常、心血管系统异常等。因此作为一项有效的检测指标,测量颈部透明带厚度已被较广泛地应用于胎儿染色体异常的筛查。

关键词: nt 多少 正常

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