Why the mother should take part in DNA paternity testing…

We are often asked if the mother should provide her DNA, after all – she knows she is the mother.

But, in actual fact, it is beneficial for the mother to provide her DNA, so we still prefer to test the mother where possible.

Why is it important?

In short – it increases the accuracy of the results.

If the mother’s DNA is included, it is possible to identify which of the child’s DNA comes from her – leaving the paternal DNA to compare against the potential father.

This means that when the mother is tested, the “probability of paternity” can be calculated with more certainty.

So although it’s not needed, the mother’s involvement provides more accurate results. However, if the mother is unable to take part, you will still receive a conclusive result – unless the laboratory require further DNA to gain a conclusive result.

For extended family tests then testing the mother’s DNA increases the likelihood of a conclusive result for any DNA test – including siblingship, aunt/uncles or grandparents, and we strongly advise that the mother of the child participates for these type of tests.

On rare occasions, the results can provide a ‘mutation’ which is where a single STR locus does not match.  A mutation means that a strand of DNA has changed length when passed on from the parent, which in turn means it is represented as a different number when reported in the paternity result.  The mother of the child must be tested at this point (preferably at the initial stage) in order to conclude a positive result.

Another reason why a single STR loci would not match, would be if a direct male relative of the putative father tested, could in fact be the biological father of the tested child.  For example, a full-brother, father or even grandfather; however in order to provide greater probability, the mother of the child is required to be tested.

Unlike other testing companies – we never charge for the mother’s sample.

For more information on DNA testing please click here.

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