Abstract
The use of ultrasound as a guidance tool for chorionic villi sampling for prenatal diagnosis in the first trimester is discussed. Three sampling techniques used in the first trimester are reviewed: endoscopy, blind aspiration, and the combination of endoscopy and aspiration with ultrasound guidance. A review of the literature found that ultrasound guidance provided the highest success rate in obtaining chorionic villi for chromosomal analysis and enzyme determination. Concerns regarding proper scanning technique for localizing the implantation site for sampling are discussed.
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