title: Screening policy for Down syndrome.
authors: D A
authors: DA
authors: Ruta
authors: J G
authors: JG
authors: Leece
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D004314:Down Syndrome / Q000097:blood / Q000517:prevention & control*; D004739:England; D004964:Estriol / Q000097:blood*; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy / Q000097:blood*; D018566:Pregnancy, High-Risk; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D006063:Chorionic Gonadotropin; D000509:alpha-Fetoproteins; D004964:Estriol