Combined Paternity Index

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