CVS or chorionic villus sampling is one of the most common prenatal diagnostic tests that are used in the medical industry. This test is done using the samples of the placental villi that are present in the placenta of pregnant females. A perinatologist is the one responsible for performing the test of Chorionic villus sampling. The process is relatively quick and the patient doesn’t need to stay overnight in order to take the test. The process of the test can either be done in a transabdominal way through the belly or in a transcervical way through the cervix. The choice of the test method is dependent on the fetus's position as well as the position of the placenta.