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18周胎盘距离宫颈口多少才正常

更新时间: 2020-11-04 00:00:00     

18周胎盘距离宫颈口7厘米以上才正常,胎盘会慢慢长上去。正常怀孕之后,胎盘下缘距离宫颈内口的距离应该大于7CM。到28周,如果短于这个数,就可以诊断为低置胎盘了。低置胎盘有出血的风险,所以引起要小心,一旦有出血,需要随时就诊。

关键词: 胎盘 距离 宫颈 多少 正常

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