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孕妇年龄
染色体异常风险
20
0.2%
35
0.5%
40
1.5%
49
14%
* 此表仅包括可由标准染色体测试来检测的染色体异常。不包括婴儿亚显微染色体异常（仅可以通过特殊测试检测）的风险。
