A grandparentage DNA test determines whether a couple
could be the biological grandparents of a child. It is an indirect
way to determine family relationships when an alleged father is
not available for a paternity test. Grandparentage test results
may be used as proof in Social Security benefit and other inheritance
claims as well as in some immigration cases.
In the test, the child’s DNA profile is compared
with the DNA profiles of the alleged father’s biological parents.
Since a child inherits half of his/her DNA from the mother (maternal
side) and half from the father (paternal side), the paternal half
should match DNA passed down from the alleged grandparents. The mother’s
participation is encouraged to expedite analysis; motherless grandparentage
tests take longer to complete because of the
extended analysis required.
Single Grandparentage Testing
A single grandparentage test determines if a child is biologically related to a single alleged grandparent. Single Grandparentage testing is a good option when there is only one of the deceased/missing AF parents available for testing.
- The report will indicate the probability of relatedness and a liklihood ratio similar to a reconstruction report. Refer to the relationship page.
- The limitations of this test is that a single grandparent shares only 25% of their DNA with a grandchild. A low liklihood of grandparentage may indicate that the tested parties are not related or indicate that the majority of the genetic information inherited by the missing AF and transmitted to the child did not come from the tested grandparent.
- We strongly encourage the mother to participate so we can account for one half of the child's genetic material and provide a more precise result. However, testing can be done without the mother of the child.
- In scenarios with limited relatives to test, investigate the possibility of utilizing Y-STR or Mt-DNA testing as well.
PlatinumPlex™ is a unique STR marker panel developed by DDC to help resolve complex family relationship cases, like a grandparentage test. Most standard paternity situations can be resolved with a standard panel of 16 STR markers. In the cases of grandparetage studies, it's often benefitial to run additional markers to help produce a more definitive answer. DDC's PlatinumPlex™ provides results that are over 1,000 times more powerful than the standard 16 marker test.
DDC will run the PlatinumPlex™ panel for an additional $100 in a grandparentage study.
If you want to ensure the PlatinumPlex™ panel is included at the initiation of your case, please speak to one of our DNA Experts to discuss your situation and we can ensure that you get the right test, with the right DNA marker panels, delivering the most accurate results.
For a free consultation or to order a test,
please use our online contact form or call 1-800-613-5768. One of
our caring, knowledgeable case managers will review the information
you provide and guide you through the testing process.