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怀孕15周头臀是多少正常

更新时间: 2020-11-05 00:00:00     

怀孕15周头臀为5.5cm左右正常,头臀长是指胎儿从颅顶顶部到臀部外缘的距离。常用顶臀径估测胎儿的孕龄,此为最为准确的估测方法,6周初由于胚芽太小,测量不准确,随着孕周的增大,胚胎的生长,其形态曲线为C形,头端相对较大而容易辨认。

关键词: 怀孕 多少 正常

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