title: Amniotic-fluid alpha-fetoprotein measurement in antenatal diagnosis of anencephaly and open spina bifida in early pregnancy. Second report of the U.K. Collaborative Study on Alpha-fetoprotein in Relation to Neural-tube Defects.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D000757:Anencephaly / Q000097:blood / Q000175:diagnosis*; D004677:Encephalocele / Q000175:diagnosis; D005189:False Positive Reactions; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D016136:Spina Bifida Occulta / Q000097:blood / Q000175:diagnosis*; D006113:United Kingdom; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins