Paternity For Life
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Relationship Testing

Why would I do Extended Relationship Testing?

For some people, direct testing of a parent-child relationship (paternity or maternity) may not be possible due to many reasons. This may be because the parent is unavailable, deceased or unwilling to participate in testing. In such cases with these circumstances extended relationship testing can be carried out to determine if there is likely to be a relation between the persons being tested.

A DNA profile is created for each of the persons to be tested. A statistical model and database are used to compare the profiles and calculate how likely it is for the alleged relationship to exist.

Whilst extended relationship testing gives the opportunity to determine a family relation without parentage testing, the more extended the relationship the harder it is to determine the relationship as the individuals will share less and less genetic material.

Who Can Be Tested?

DNA testing can be performed on individuals that share common relatives e.g Full or Half Siblings, Aunts, Uncles, Nieces, Nephews, Grandparents, Cousins etc. Please see our range of testing options below.

Sibling DNA Test From $500

A Sibling DNA test is recommended where two alleged full or half siblings (male or female) wish to confirm if they share at least one biological parent. A Sibling DNA Test will determine the likelihood that the two persons tested are likely to be full or half siblings based on the amount of common DNA shared between them.

Aunt/Uncle DNA Test From $500

An Aunt and Uncle DNA Test can be used to determine if a biological relationship is present between Aunts and Uncles and their Nieces and/or Nephews

Grandparent DNA Test From $500

A Grandparent DNA Test can be used to determine if a biological relationship is present between Grandparents and their Grandchildren

Twin Zygosity Test From $250

Twin Zygosity DNA Testing compares the DNA profile from twins to determine if they are identical or fraternal (non-identical) twins.

Understanding Your Results

Unlike Paternity or Maternity DNA testing, Relationship DNA Testing cannot give a conclusive result of whether a relationship exists between the persons being tested. This is because Relationship tests involve comparing less direct relationships than that of a parent and child. A child will inherit 50% of their DNA from each parent, allowing for a conclusive result to be given in the case of Paternity or Maternity. Siblings will share a lower percentage of DNA.

Instead, the results will show the likelihood of a relationship between the tested persons based on the amount of common DNA.

  • A likelihood ratio less than 1 – a relationship is unlikely to exist.
  • A likelihood ratio greater than 1 – It is likely that a relationship exists. The greater the number above one, the greater the likelihood the persons tested are related.

If you are unsure of the DNA test you need, please contact us to discuss your particular case. We can help determine which test would be best suited for you based on what it is you are looking to confirm through DNA testing and what the alleged relationship is between the persons to be tested.

DNAQ advises that the results may be inconclusive for an Extended Relationship DNA test. This is not due to laboratory error, but as explained above, due to the difficulty in comparing individuals in extended relationships.

Please note: No testing costs will be refunded in the case of inconclusive results.



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