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21三体综合征是人类最常见的染色体异常引起的疾病 ,是先天性智力低下的最常见的原因。因为唐氏综合征无法治疗 ,故只有进行早期诊断 ,终止妊娠。近年来许多学者采用孕早、中期的母体血清标记物的筛查及胎儿的超声波检查 ,达到优生的目的。
Trigeminal syndrome is the most common chromosomal abnormalities caused by human diseases, congenital mental retardation is the most common cause. Because of Down’s syndrome can not be treated, so only for early diagnosis, termination of pregnancy. In recent years, many scholars use early pregnancy and mid-term screening of maternal serum markers and fetal ultrasound to achieve the purpose of eugenics.