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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.
If both the mother and the father of a baby are carriers for the same genetic disorder, testing can be done prior to or during a pregnancy to determine if that particular pregnancy is affected (got both of the non-working copies). However, there are often no cures or treatments for these disorders.