Your paternity test results will tell you whether the alleged father is in fact the true father of the child with a 99.99% and conversely exclude the alleged father as being the true paternal father with a rate of exclusion of 100%. Laboratories analyze a total of 20 genetic markers and determine the probability that each marker or allele has been passed on by the alleged father rather than by any other individual in a population of the same ethnic group. Thus, for each of these genetic markers the laboratories draw up a paternity index and will have a total of 20 after having examined all 20 markers. The Combined Paternity Index refers to the multiplication of all these paternity indexes which is then expressed as the percentage with the inclusion or exclusion of paternity. More about this can be found by visiting Understanding Your Paternity Test Results.