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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.
There are no dangers to the mother or the fetus from these screening tests, but positive screening results are not diagnostic. A new screening test done at 10 weeks of pregnancy, called cell-free fetal DNA testing, uses the mother's blood to detect Down syndrome.here are no dangers to the mother or the fetus from these screening tests, but positive screening results are not diagnostic. A new screening test done at 10 weeks of pregnancy, called cell-free fetal DNA testing, uses the mother's blood to detect Down syndrome.