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胎盘一级到二级要多少天
更新时间: 2020-11-05 00:00:00  

超声检查时,可将胎盘的成熟度分为四级——0级、1级、2级和3级。正常情况下,怀孕28周之前胎盘分级为0级,28周开始胎盘的分级可能是0-1级,36周左右时胎盘分级可以1-2级,40周左右胎盘的分级可为2-3级。一般来说2级以上胎盘提示胎儿成熟,达到3级表示胎盘已成熟并趋向老化,不利于胎儿对营养物质的吸收。1级胎盘可出现在怀孕29-36周之间,1-2级的时间大约经过8周左右。

关键词: 胎盘 一级 二级 多少

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