Experience with real time ultrasound directed transcervical chorionic villus biopsy.
D000293:Adolescent; D000328:Adult; D001706:Biopsy; D002824:Chorionic Villi / Q000473:pathology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis; D014463:Ultrasonography