How accurate is fetal paternity testing? Fetal paternity testing is a method of determining the parent-child relationship by sampling fetal DNA through amniotic fluid or villi. Compared with conventional paternity testing, fetal testing does not need to wait until the baby is born and can be performed during pregnancy. But how accurate is fetal identification? Its reliability is discussed below from four aspects. 1. False-positive results are prone to occur. Fetal identification is prone to false-positive results, that is, it is determined that there is a father-child relationship, but in fact