The IDENTIGENE paternity test result shows DNA profiles for each participant, the combined parentage index (CPI), and a percentage of probability indicating the strength of the results. All of this information in a paternity test answers one specific question.
DNA Markers in Paternity Testing.
The DNA profiles in paternity testing consist of DNA markers (usually 15) that are used to determine if there is a biological match, the same codis markers used by the FBI for DNA evidence. Each Marker location shows 2 alleles. Everyone receives one number from their biological mother and one number from their biological father. These markers are analyzed to verify matches between the alleged father and the child. If the markers between the alleged father and child match they are given a Parentage Index number that indicates how common that marker is among the population. If the marker is rare the number will be higher, if the marker is common the number will be lower. These numbers calculate to give the probability of paternity. The probability of paternity for inclusions must be higher than 99%. The probability of paternity for exclusions will show as 0%.
| Locus | Alleged Father | Child | Parentage Index |
| D2S1338 | 12,13 | 10,12 | 1.845 |
| D2S1358 | 8,11 | 11,14 | 2.714 |
| D8S1179 | 21.2, 32 | 19, 21.2 | 3.675 |
| D19S433 | 15,18 | 12,15 | 8.338 |
The Conclusion Section of the Paternity Test Results
When you read the conclusion section of your paternity test results you will find one of the following statements followed by a percentage of probability.
John Doe is excluded as the biological father of James Doe.
This means that John Doe cannot be the father of James Doe because the analysis shows that they do not share a paternity relationship and the report will indicate a 0% paternity probability.
John Doe is not excluded as the biological father of James Doe.
This means that John Doe is considered to be the father of James Doe because the analysis shows that they share a paternity relationship. The probability of paternity will show 99% or higher.
Why does the paternity test report say “not excluded” if the person is the father?
With paternity testing it is possible to exclude a possible father with 100% certainty; however, the only way to include someone as the biological father with 100% certainty would be to test the entire genome of an individual. That means their entire DNA. Paternity tests use a standard of 15 markers which can get probabilities up to 99.99% which means he is “not excluded”. The paternity test results are 99.99% confident that he is the biological father.
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