Amniocentesis in the second trimester.
D000649:Amniocentesis; D004314:Down Syndrome / Q000175:diagnosis; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis; D005817:Genetic Counseling; D006801:Humans; D009436:Neural Tube Defects / Q000175:diagnosis; D011247:Pregnancy; D011262:Pregnancy Trimester, Second