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Assessing DNA test reports - advice from the Home Office


In assessing DNA test reports, the question to be addressed is whether the evidence establishes the relevant relationships on a balance of probability:


  • if a DNA test report concludes that the probability of a claimed relationship is at least three times greater than any other relationship, this should normally be accepted as proof of that relationship without further enquiry;
  • where the DNA evidence concludes that the probability of the claimed relationship is only twice as likely (or less) than any other relationship, caseworkers should review the case as a whole. However, it must be remembered that even a low balance of probability in favour of the claimed relationship is substantial evidence and should be accepted unless there is strong evidence to the contrary.



The DNA test report should be checked carefully to ensure that all of the children who are included in the appeal have been tested and are related as claimed to the alleged parents. Care should be taken to ensure that the persons tested (both children and parents) are the same as those included in the application or appeal. The fact that some children prove to be related as claimed does not constitute evidence in favour of other children who were not tested; refusal should be maintained in relation to any children not tested.


For further information on assessing the information arising from DNA tests please visit the Home Office website.

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