Grandparentage DNA Test

Endeavor DNA offers confidential, accurate, fast, and affordable grandparentage testing services.

A grandparent DNA test calculates the likelihood of relatedness between a child and one or both grandparents.

Because a child inherits exactly 50% of its genes from its biological mother and 50% from its biological father, that child shares exactly 25% of its genes with each biological grandparent. If both biological parents of the alleged father are tested and they do not possess the paternal genes between them, then they are excluded (ruled out) as the biological grandparents. When both biological parents of the alleged father possess the paternal genes between them, they are not excluded as the biological grandparents. For grandparentage tests, we recommend testing both alleged grandparents as well as the mother if possible to achieve the most accurate results – see Missing Parent page.

It is important to understand that it may not be possible to obtain conclusive results in a grandparent DNA test if both alleged grandparents are not tested.  This is because testing one alleged grandparent allows us to identify only half of the possible genes of the unavailable alleged parent.  It is also important to understand that, in reporting the results of a DNA grandparent test, the laboratory assumes that the tested alleged grandparents are, in fact, the biological parents of the unavailable alleged parent.  If there is any question regarding the paternity of the unavailable alleged parent, then the alleged biological grandfather should not be tested.

Endeavor DNA offers a 2 business  day turnaround on grandparentage tests utilizing either buccal swabs or specimen collection cards (WhatmanTM FTA® or WhatmanTM903) with rush testing options available. Endeavor DNA can also test a multitude of other sample types, but longer turnaround times may apply.

All Endeavor DNA grandparentage tests utilize stringent, validated testing procedures and include up to 22 STR loci plus the gender identification marker amelogenin in order to achieve 100% accurate results.

Call Us for a free, no obligation consultation. (915) 519-1600