Amniocentesis.
D000649:Amniocentesis; D000650:Amnion; D000653:Amniotic Fluid / Q000032:analysis*; D004899:Erythroblastosis, Fetal / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011677:Punctures; D013053:Spectrophotometry