Non-invasive DNA is not capable of performing paternity testing. Non-invasive DNA is not a means of paternity testing and paternity cannot be established through this test. Non-invasive DNA is a means of checking fetal chromosomes by collecting venous blood from a pregnant woman. This is done primarily by extracting DNA from the mother’s peripheral blood, then measuring the sequences therein, and finally analyzing it for the presence of genetic abnormalities in order to determine the risk of three chromosomal disorders. Therefore non-invasive DNA results will be out in about a week or so. In order to ensure the accuracy of the results, it is important to choose a regular company or organization for the test.