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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.
You may need this test before a blood transfusion to check your specific blood traits. You may also have this test early in your pregnancy to check for antibodies that might affect your fetus. This is a routine blood test most often done at your first prenatal office visit. You may also have this test if you need an emergency blood transfusion during delivery.