Midtrimester amniocentesis for prenatal diagnosis.
D000649:Amniocentesis / Q000009:adverse effects; D005260:Female; D006801:Humans; D008423:Maternal Age; D009436:Neural Tube Defects / Q000175:diagnosis; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D018566:Pregnancy, High-Risk; D011296:Prenatal Diagnosis