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正常怀孕多少天b超可见卵黄囊
更新时间: 2020-11-04 00:00:00  

正常怀孕40天以后就会有卵黄囊生长。根据末次月经推算的预产期有50%不准确,需要妊娠早期超声确认或者校正,特别是妊娠11-13加6周胎儿测量CRL估计孕龄是最为准确的方法。怀孕大于等于14周,需要采用双顶径,头围,腹围和股骨长综合判断孕龄。如果妊娠22周前没有进行超声检查确定或者校正孕龄,单纯根据末次月经推算的预产期,称为日期不准确妊娠。

关键词: 正常 怀孕 多少 可见 卵黄

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