This depends on which prenatal test is carried out. The actual DNA sample collection for the non invasive paternity test easyDNA offers can be done in a few minutes since only it only requires a blood draw. It is the quickest and most straightforward paternity test in pregnancy available.
Other prenatal paternity testing methods (such as amniocentesis) require more elaborate sample collection procedures that are done by a gynecologist. The gynecologist will need to carry out an ultrasound, apply local aneasthetic and insert a sterile needle through your abdomen.