Chorionic villus samplingBy Mayo Clinic staff
Original Article: http://www.mayoclinic.com/health/medical/IM00083
Chorionic villus sampling
During chorionic villus sampling, a thin tube is guided through the cervix (shown above) or a needle is inserted into the uterus to remove a sample of chorionic villus cells from the placenta. These cells contain a baby's genetic information.