Establishing Paternity by DNA Testing
Results of Paternity DNA Tests
For every match in a paternity test, a paternity index is calculated. The paternity index is a calculation of how frequently that match occurs in a particular race population. It is the likelihood that the tested man is the biological father of the tested child based on that locus. But 1 locus is not enough to conclusively determine paternity. That is why we conduct DNA testing on 16 different loci for paternity tests.
Each locus has its own paternity index. If all the loci match, the paternity indices for each are combined and a probability of paternity is calculated. The probability of paternity is the final percentage calculated.
Our laboratory routinely generates probabilities of 99.999% and higher, when paternity testing, which means that the tested man is 99.999% more likely than any other man in his race population to be the biological father of the tested child.
If during paternity testing the tested man does not match the tested child on a locus, the paternity index for that locus is 0. If there are 4 or more non-matches in a paternity test, it is concluded that the tested man cannot be the biological father of the tested child. The probability of paternity is 0%.
Your final DNA test results will include a list of each locus tested along with the number representation of your DNA at that loci. The DNA test results will also record all calculated paternity indices and the final probability of paternity percentage generated in the paternity test.
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