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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.
DNA can be sequenced - you can get the exact base pair sequence. Again, this can tell you about the persons genetic make up... different versions of different genes they have, etc. In an experimental lab, it can verify that you are working with the DNA that you think you are. DNA can be put through chromation immunoprecipitation assays (ChIP) In this test, you are looking for a protein that bind to a particular sequence of DNA.