Letter: amniotic alpha-fetoprotein levels and anencephaly.
D000328:Adult; D000510:Alpha-Globulins / Q000032:analysis; D000531:Altitude; D000653:Amniotic Fluid / Q000032:analysis*; D000757:Anencephaly / Q000175:diagnosis*; D000013:Congenital Abnormalities / Q000209:etiology; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis; D005326:Fetal Proteins / Q000032:analysis*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014463:Ultrasonography
D000510:Alpha-Globulins; D005326:Fetal Proteins