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nt时头臀长多少正常
更新时间: 2020-11-04 00:00:00  

在怀孕期间检查nt,一般建议在怀孕11周至13+6周之间,通过超声查看胎儿颈项透明层的厚度。正常值在0.3厘米以内。超出0.3厘米,说明胎儿存在异常,需要做进一步的检查化验,可以选择做无创DNA检查。在怀孕20周到24周之间,需要做一次四维超声检查检查胎儿肢体及各脏器的发育情况。整个孕期要远离辐射环境,戒烟戒酒,保证营养均衡。

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