How It’s Done

Health |

CVS may be performed using a transcervical or transabdominal method, depending on which is safer for your pregnancy. The more common transabdominal method is similar to amniocentesis. You lie on the examining table and the doctor uses ultrasound to find a good spot to insert the needle. The site is swabbed with antiseptic and numbed with an injection of anesthetic. A guide needle is inserted through the abdominal wall into the uterus, then a smaller needle is threaded through the guide needle and some chorionic villi tissue is removed. Ultrasound is used throughout the procedure. Click here or on the picture above to see an illustration.