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随着人们生活水平的提高,预防重大缺陷儿的出生已经成为国家,社会及每个家庭都充分重视的问题。以21三体(先天愚型)为主的染色体病随着孕母年龄的增加
With the improvement of people’s living standards, the birth prevention of children with major defects has become a problem that the state, society and every family attach great importance to. Chromosomal diseases dominated by trisomy 21 (Down’s syndrome) increase with the age of pregnant mothers