Chorionic villus sampling for Down's syndrome.
D000649:Amniocentesis; D015193:Chorionic Villi Sampling / Q000379:methods*; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D012189:Retrospective Studies