Understanding Your DNA Test Results
Paternity Testing Results
In a paternity test, whether for personal knowledge or court admissibility, there are three possible outcomes.
- Excluded. The probability of paternity will be 0.0%. This means that the alleged father is NOT the biological father of the child. This occurs when an alleged father’s DNA does not match on at least 23 of the 25 tested genetic markers.
- Cannot be excluded. The probability of paternity will be at 99% or greater. This means that the alleged father is, in all reasonable probability, the biological father. 99.9% (and higher) is the greatest probability that science can provide for proof of relationship. In legal cases, most courts accept a probability of 97% and greater as proof that the tested male is the biological father.
- Inconclusive. This is extremely rare and occurs in cases where insufficient DNA has been provided for one or more of those being tested. This result would require a re-submission of DNA samples.
Relationship Testing: Sibling (Half/Full) / Grandparent / Avuncular (Aunt/Uncle) Results
90.9% – 99.9+% – The Genetic Evidence Indicates the Tested Relationship is Confirmed.
80% – 90.8% – The Genetic Evidence Indicates the Tested Relationship is Highly Likely but it is still suggested that additional family members have their DNA submitted for a more conclusive result.
50% -79.9% – The Genetic Evidence Indicates the Tested Relationship is Possible. It is suggested that additional family members have their DNA submitted for a more conclusive result.
30% – 49.9% – The Genetic Evidence Indicates the Tested Relationship is Not Likely. It is suggested that additional family members have their DNA submitted for a more conclusive result.
10% – 29.9% – The Genetic Evidence Indicates the Tested Relationship is Highly Unlikely.
0% – 9.9% – The Genetic Evidence Does Not Support the Biological Relationship.
The reports that DNA Testing Experts testing laboratories deliver are the most accurate results available, using the highest number of markers approved by the AABB for relationship testing. The results delivered on the reports are the same for both personal knowledge and legally admissible results, with the exception being that the legally admissible testing has followed proper collection guidelines, and completed the needed documentation required for court ready DNA testing reports.
Y-STR Testing: Male Lineage Results
If the testing results show they cannot be of the same male linage then there is no paternity of the alleged father if performing this test for paternity purposes.
If the testing indicates that they cannot be excluded from being of the same male line, and if being done to establish paternity, then the probability indicated is the likelihood that the alleged father is the biological father, however, a possibility remains that the biological father might be the brother of the alleged father because they are part of the same lineage and would both have the same Y-chromosome so doing a direct paternity test is the best way to establish specifically what the relationship is.
If you have still have unanswered questions about your DNA test results please fill out a support ticket and one of our Genetic Consultants will be happy to help answer your questions.