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There are two basic types of DNA testing that can be done before delivery. These include amniocentesis and CVS, or Chorionic Villus Sampling. An amniocentesis is generally performed during the second trimester of pregnancy. Typically, it would take place between the 14th and the 20th week of pregnancy.
About 3% to 5% of women who have the screening test will have an abnormal reading, but only a small percentage of those women will actually have a child with a genetic problem. Non-Invasive Prenatal Testing (NIPT) screening: This cell-free fetal DNA test can be done as early as after 10 weeks of pregnancy.