24周同样可以抽羊水化验，抽脐带血直接查红细胞更准确。21周以前抽脐带血危险太大，所以只能抽羊水查脱落细胞DNA。

来源: 老道于 2022-10-11 13:49:28 [旧帖] [给我悄悄话] 本文已被阅读：次

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