title: Early prenatal diagnosis of neural tube defects by ultrasound.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis; D000757:Anencephaly / Q000175:diagnosis; D002490:Central Nervous System / Q000002:abnormalities / Q000196:embryology*; D004677:Encephalocele / Q000175:diagnosis; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis; D008722:Methods; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D016135:Spinal Dysraphism / Q000175:diagnosis; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D000509:alpha-Fetoproteins