title: New uncertainties in prenatal screening for neural tube defect.
mesh_terms: D000110:Acetylcholinesterase / Q000032:analysis; D000653:Amniotic Fluid / Q000201:enzymology; D004314:Down Syndrome / Q000175:diagnosis; D005260:Female; D006801:Humans; D008403:Mass Screening / Q000379:methods*; D009436:Neural Tube Defects / Q000175:diagnosis / Q000453:epidemiology*; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D012306:Risk; D014463:Ultrasonography; D006113:United Kingdom; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D000509:alpha-Fetoproteins; D000110:Acetylcholinesterase