天气预报 > 其他 > 25周4天羊水多少正常
25周4天羊水多少正常
更新时间: 2020-11-05 00:00:00  

25周4天羊水指数范围在15.5-15.6厘米;羊水量正常值在200-500毫升。

羊水量的多寡因人而异,通常随着妊娠周数增长而逐渐增加,十二周时有50cc,怀孕中期大约3、400cc,直到妊娠三十六至三十八周达到最大量的1000cc左右,过了预产期则显著减少。怀孕初期的羊水主要由覆盖胎盘和脐带的羊膜所分泌,到了四个月之后,胎儿吞食羊水与排尿能够调节羊水的量及成份,同时羊水进出呼吸系统也会有所影响。

关键词: 羊水 多少 正常

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