chorionic villus biopsy

Chorionic villus biopsy

A procedure used for prenatal diagnosis at 10-12 weeks gestation. Under ultrasound guidance a needle is inserted either through the mother's vagina or abdominal wall and a sample of cells is collected from around the early embryo. These cells are then tested for chromosome abnormalities or other genetic diseases.

Mentioned in: Wiskott-Aldrich Syndrome

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chorionic villus biopsy

Chorionic villus sampling Obstetrics A method for early–1^st trimester diagnosis of fetal genetic defects and other diseases; tissue is obtained at 8-12 wks–vs 16^th wk for amniotic fluid analysis from developing placenta by ultrasound-guided transcervical catheter aspiration Bx; tissue obtained is from the chorion frondosum, the layer from which chorionic villi develop Diagnostic yield CVB, 97.8% vs amniocentesis at 16 wks, 99.4%. See Amniocentesis.