Results to a paternity DNA test will include on them what is called a combined paternity index (CPI). The notion behind each paternity index is a value which shows the chances of the father being the biological father rather than any other male chosen at random from a population. Most DNA testing companies analyze 15 loci on the DNA; for each locus they determine again the chances of the allele being passed to the child by the father rather than any other person from a similar ethnic background. When all the 15 paternity indexes are drawn up they are then combined together to form the Combined Paternity Index. The value is finally converted from a Combined Paternity Index into a percentage.

Results will show exclusion of paternity with a percentage of 100 and an inclusion percentage of 99.99. The combined paternity index and the paternity index are just two of the important aspects of your results. Another thing you will see displayed on the report sent to you following your DNA test is the amelogenin sex gene. The amelogenin sex gene is just one of the many genes that determines the sex of a person and it is found on both the X and Y chromosome. All test results will show this gene and testing for it is essential to know whether the sample tested belongs to a male or female. Click here for more information.

To find more about this, please visit Understanding Your Test Results.


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