DNA paternity tests analyzes up to 15 locations looking for matches between the alleged father and child. All markers must reflect a match (or mutation) or the alleged father is not the biological father. Each match receives an paternity index value indicating the strength of the match; the more unique the match, the higher the index. The probability of paternity is calculated using all of the paternity index values.
Most DNA paternity tests that examine only an alleged father and child show a conclusive probability of paternity: usually 99.99% when the alleged father is included as the biological father or 0% when he is not the father. In some cases, the matches between an alleged father and child provide an inconclusive result. Having the mothers DNA would provide a conclusive result.
In such instances, DNA Worldwide requests DNA samples for the biological mother. If she is unavailable, the test result remains inconclusive. With the mother, DNA paternity testing almost always provides a strong, conclusive result. Even when results are conclusive, including the mother further strengthens the DNA test conclusion.
The UK Government advise potential individuals seeking a DNA test for Paternity to always test the mothers DNA.
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