Grand-parentage Analysis Grand-parentage testing is designed to provide definitive answers when trying to
establish a biological relationship between an individual and the alleged grandparents. This test is usually used as an indirect way of establishing Paternity or Maternity. Unlike the Sibling analysis, it will indicate the identity of the biological parent i.e. If a test establishes a biological relationship between a child and the alleged grandparents, then the child’s biological parent has to be one of the grandparents’ children.
However,
if for example there are two alleged fathers that are brothers, this test will not be able to distinguish between them. Only a Paternity DNA test will do that. There are two different types of Grand-Parentage testing: Single Grand-parentage DNA Analysis
This test is ordered when the analysis involves ONE alleged biological Grandparent. The cost of the test includes ONE Grandparent and one grandchild.
Additional children are each charged at the additional person rate. Duo Grand-parentage DNA Analysis
This test is ordered when the analysis involves BOTH alleged biological Grandparents.
The cost of the test includes BOTH Grandparents and one grandchild. Additional children are each charged at the additional person rate. How does Grand- parentage analysis work?
During
a Grand-parentage DNA test, the DNA profile of each alleged Grandparent is obtained and compared to the DNA profile of the child in question.
For a person to be a biological grandparent, it means that their own biological child is the biological parent to the grandchild in question. Accuracy
Grand-parentage DNA testing is less accurate than paternity or maternity testing. For this reason,
it should be considered only if a paternity, maternity or Y chromosome test cannot be done. The laboratory will analyse the samples to produce a ‘likelihood ratio’. The higher this number is, the stronger the evidence of a relationship. likelihood ratio | strength of evidence | 1001+
| very strong | 331-1000 | strong | 101-330 | good | 34-100 | fair/moderate | 21-33 | weak/limited | 1-20 | inconclusive |
|
 There is always the chance that the Grand-parentage test will yield an INCONCLUSIVE result. This occurs in approximately one in five cases. Clients should be fully aware of the limitations of the test before proceeding. There are no refunds for inconclusive tests.
To make an appointment for a Grand-parentage DNA test please contact us.
| 
