title: Prenatal screening for Down's syndrome.
mesh_terms: D004314:Down Syndrome / Q000175:diagnosis*; D004964:Estriol / Q000097:blood; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*
chemical_list: D004964:Estriol