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孕期nt检查值多少正常值是多少
更新时间: 2020-11-05 00:00:00  

NT检查怀孕早期排畸检查,又称胎儿颈部透明度检查,一般NT检查数值小于2.5mm属于正常情况。

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: 孕期 nt 检查 多少 正常值

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