DNA testing during pregnancy though is common, it is considered risky and harmful to the mother and baby. Hence, it is advisable to avoid any paternity testing for females who are expecting. Usually, the reasons for the prenatal testing are to confirm on several theories like confirming on the biological identity of the father, detect the sex of the baby and to confirm the pregnancy. Carrying out this test during pregnancy is 99.9% accurate in proving paternity.

There are two choices of the prenatal testing that is available. Amniocentesis is the test performed in the second trimester (14th to 24th week). In the procedure, the doctor uses ultrasound to guide a thin needle into the uterus section through the abdomen to extract a small amount of amniotic fluid for testing. However, the risks included small chance of hurting the baby and also miscarriage. Side effects like cramping, leakage of amniotic fluid and vaginal bleeding may occur.

CVS, or better known as Chrionic Villus Sampling include the insertion of a thin needle or tube from vagina through the cervix guided by ultrasound to obtain chrionic villi. The villi are little finger structure that attached to the uterus wall. The importance is that it and the fetus have the same genetic makeup as they came from the same fertilized egg. The test could be done earlier in pregnancy from the 10th till 13th weeks.

This testing on the unborn baby is costly, from $1000 to $2000. It is now compulsory to get doctors' consent to have the testing done. As we know, testing conducted after a baby's birth involves no known risks.

So this prenatal testing issues an important warning - prenatal DNA testing done in conjunction with other prenatal testing involves some risk associated with how the testing is conducted, whether amniocentesis or CVS. These tests are often discouraged for the sole reason of seeking paternity because of the increased miscarriage risk.