title: Diagnosis of trisomy 21 by chorionic villus biopsy.
mesh_terms: D000328:Adult; D001707:Biopsy, Needle; D002824:Chorionic Villi; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis