DNA testing carried out during pregnancy is called prenatal DNA testing and postnatal DNA testing is the one performed after birth. To perform prenatal DNA testing, a sample of tissues from the placenta or a sample of amniotic fluid is examined and analyzed. The collection methods for prenatal DNA testing include a number of health risks for foetus as well as mother. The two types of prenatal DNA testing are discussed in details.
This prenatal DNA testing can be performed in the second trimester of pregnancy. In this method, amniotic fluid is collected by inserting a special needle into the uterus through the abdomen. Before the insertion of the needle, ultrasound is carried out to know the possibilities of any complications, which may arise while performing amniocentesis. Doctors usually discourage the idea of carrying out this prenatal DNA testing because of the risks associated with it such as leakage of the amniotic fluid, leakage of the uterus and miscarriage.
Another DNA Test, which can conducted during pregnancy is chorionic villus sampling. This test is undertaken in the last month of the first trimester of pregnancy .i.e. third month of pregnancy. Under CVS, sample of chorionic villus is collected from the uterus by guiding a needle or small tube into it thorough the vagina and cervix.
Chorionic villi – It is a small piece of tissue found on the uterine wall. This tissue is used for obtaining genetic information about the foetus as this tissue is produced from the same fertilised egg, which has developed into foetus.
The procedures to carry out both the prenatal DNA tests carry life-threatening risks to unborn child and the mother. The risks increase if the DNA test is conducted after 24th week of pregnancy. At this stage, the risk of miscarriage is so high that the doctors usually do not suggest such tests.
In case of doubt of parental identity, it is crucial to undertake DNA test. However, postnatal DNA testing should be chosen. A doctor must be consulted to know about these tests and the various risks associated with them.
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