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34周羊水是多少正常
更新时间: 2020-11-05 00:00:00  

孕34周羊水指数的正常范围是8~18cm之间。羊水的来源、量和成分随孕周不同而有所变化。妊娠初期,羊水主要是母体血清通过胎盘进入羊膜腔的透析液,少量从胎盘表面和脐带表面渗出。当胎儿血循环形成后,胎儿体内水分和小分子可经尚未角化的胎儿皮肤渗出,构成羊水的一部分。

关键词: 羊水 多少 正常

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