Prenatal diagnosis is possible using amniocentesis or chorionic villus sampling. Prenatal diagnosis is possible by chorionic villus sampling or amniocentesis. Common diagnosis procedures include amniocentesis and chorionic villus sampling. Turner syndrome may be diagnosed by amniocentesis or chorionic villus sampling during pregnancy. Triple X syndrome can be diagnosed prenatally through amniocentesis or chorionic villus sampling. Amniocentesis and chorionic villus sampling (CVS) are procedures conducted to assess the fetus. Because amniocentesis and chorionic villus sampling are invasive, they have a chance of causing miscarriage. Such tests include amniocentesis, ultrasounds, and other preimplantation genetic diagnostic tests. Cell-free DNA, Amniocentesis, and Chorionic Villus Sampling (CVS). This prenatal testing does require a CVS or amniocentesis. Before birth, amniocentesis or ultrasound may support the diagnosis. Sonography and amniocentesis allow parents to determine sex before childbirth. Genetic counseling and genetic testing such as amniocentesis are usually offered during the pregnancy. Ultrasound can increase suspicion for the condition, which can be confirmed by amniocentesis. Several researchers worked on the development of amniocentesis for fetal sex determination in the 1950s.