产前筛查是指通过母血清标志物的检测来评价孕妇怀有某些先天缺陷胎儿的风险度,先天缺陷主要包括21-三体综合征、18-三体综合征和神经管缺陷等。据统计,21-三体综合征和神经管缺陷是我国围产儿死亡原因的主要组成部分[1],二者临床表现为严重的不可逆智力障碍,且均无法进行治疗,只有通过产前诊断才能防止患儿出生。因此,通过产前筛 Prenatal screening refers to the detection of maternal serum markers to assess the risk of pregnant women with some birth defects of the fetus, birth defects, including trisomy 21, trisomy 18 and neural tube defects. According to statistics, 21-trisomy and neural tube defects are the main causes of perinatal death in China [1], the clinical manifestations of severe irreversible mental retardation, and were unable to treat, only through the ability of prenatal diagnosis Prevent children from birth. Therefore, through the prenatal screen