24周同樣可以抽羊水化驗，抽臍帶血直接查紅細胞更準確。21周以前抽臍帶血危險太大，所以隻能抽羊水查脫落細胞DNA。

來源: 老道於 2022-10-11 13:49:28 [舊帖] [給我悄悄話] 本文已被閱讀：次

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