free villus

Objective The aim of the study is to determine serum contents of maternal serum markers including alpha fetoprotein(AFP)and free beta-human chorionic gonadotrophin(free beta-hCG)in mid-pregnancy,and explore its clinical value of screening for Down s syndrome(DS).

目的检测孕中期(14～20周)妇女血清中甲胎蛋白(AFP)和游离绒毛膜促性腺激素(F-β-hCG)的含量,探讨其在唐氏综合征(DS)筛查中的价值。

Objective To investigate the effect of screening for Down syndrome(DS)by detecting serum AFP and F-β hCG in pregnant women(14 to 20 weeks).

目的探讨孕中期妇女(14～20周)外周血甲胎蛋白(AFP)和游离β绒毛膜促性腺激素(F-βhCG)在胎儿唐氏综合征产前筛查中的作用。