Objective: To explore the practical value of Down's screening and antenatal diagnosis in preventing and decreasing chromosomal disease and congenital birth defect.
目的：探讨唐氏筛查及产前诊断在预防和减少染色体病及先天缺陷儿出生的实用价值。
Anencephaly is a form of neural tube defect that is typically an isolated birth defect that is not related to chromosomal abnormalities.
无脑儿是神经管缺陷的一种类型，是单纯性先天性缺陷，与染色体异常无关。
Anencephaly is a form of neural tube defect that is typically an isolated birth defect that is not related to chromosomal abnormalities.
无脑儿是神经管缺陷的一种类型，是单纯性先天性缺陷，与染色体异常无关。
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