Select Page

Grandparentage – Legal Test

What is a Grandparent DNA Test?

A grandparent Legal DNA test is used to compare the DNA of two individuals, a grandparent and a child in the event the child’s parent is not available for any reason.

How does the Grandparent DNA (Legal) Test work?

A grandparent DNA test is used to compare the DNA

markers of two individuals to determine if they are biologically related. The DNA sample from the two individuals, (a grandparent – paternal, biological mother and a grandchild/child) using a cheek swab is taken from the individuals and is processed to determine if they have similar DNA markers.These markers between the child and the paternal grandparent are compared to determine if grandparents are related to children.
The comparison of the DNA is done between the child, the mother and the paternal grandparent. Since DNA of a child is 50% maternal and 50% paternal, the test can prove if the father is related to the child as the paternal father has 50% of his father’s DNA and 50% of his mother’s DNA. The children will indirectly show if they are related to the father of the child through the grandparent.
This grandparent DNA test is a complicated test and involves careful crafting of the test and individuals involved. It is highly recommended that the paternal grandparent (at least one) should be included in the test or the results could be inconclusive.

How are the results reported?

The test results are based on a percentage of the relationship. If the index shows a 99.999 % relationship then there is a clear indicator that the children are related. If a percentage indicator shows a lower percentage it indicates a no match or an inconclusive result.

This test can be used for legal purposes. The non-legal test will be an informational test only and to provide peace of mind.
SmarTest Labs will provide you the appropriate guidance throughout the selection, testing and results delivery process of your grandparent DNA test. We conduct the test under a strict Chain of Custody to retain the accuracy of the grandparent DNA test results.