Amniocentesis in the West Midlands: report on 1000 births.
D000649:Amniocentesis; D000653:Amniotic Fluid / Q000378:metabolism; D002869:Chromosome Aberrations / Q000175:diagnosis*; D025063:Chromosome Disorders; D004739:England; D005260:Female; D006801:Humans; D008423:Maternal Age; D009436:Neural Tube Defects / Q000175:diagnosis*; D011247:Pregnancy; D011296:Prenatal Diagnosis; D000509:alpha-Fetoproteins / Q000378:metabolism
D000509:alpha-Fetoproteins