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How Accurate is Grandparent DNA Testing?

How Accurate is Grandparent DNA Testing?

Grandparent dna test

Testing for family heritage and DNA has grown in popularity recently. There are many reasons to have a DNA test, including knowing your family history and reuniting with your biological relatives. This testing is necessary to learn more about the relationship between a grandparent and their presumed grandchild. When the parents are unavailable, a grandparent DNA test is carried out to verify the family tree or the lineage. In this Blog, we will discuss a grandparent DNA test and why it is essential, what generates the need for a grandparent DNA test, how accurate it is, and the best options of grandparent DNA testing services available in the market with ChoiceDNA and how accurate is grandparent DNA testing

What is a Grandparent DNA Test?

A grandparent DNA test is frequently necessary when the mother or purported biological father is unavailable for testing. To establish a biological tie with the family, a grandparent DNA test is the next step to take if the alleged parents are not available.

Family reunification can be facilitated via DNA testing, such as grandparent testing. A grandparent DNA test can offer you the information you need if you are a grandparent and have doubts about your biological link with your purported grandchild. A paternity or maternity test is not an option.

Grandparent DNA test percentage:

The DNA molecules of any offspring of the test grandparents will match their mother’s DNA inherited from the grandmother in the test by 50% and their father’s DNA, passed down from the grandfather by 50%. A kid will thus receive 50% of the genetic material that each grandparent inherited. As a result, genetic markers found in prospective grandparents’ DNA profiles will appear in their biological grandchildren’s DNA profiles.

The question of accuracy usually pops up: how accurate is grandparent DNA testing?  These assessments are precise. We obtain definitive DNA findings in more than 99 percent of test cases. However, there is a slim possibility that the test may produce an inconclusive result, just like with any other DNA test. Negative findings and inconsistent outcomes are not the same thing. An inconclusive finding indicates that the study cannot address the raised question. Less than 1% of Grandparent DNA test findings are inconclusive. 

Among the reasons why DNA test findings are unclear:

  • Most of the population has high levels of DNA markers that indicate matches between test takers. Therefore, there is insufficient information from the matches to determine if a biological tie exists.
  • If the number of DNA matches is less than expected. This is a result of family inheritance being haphazard.
  • A mutation has altered the DNA marker in areas where matching may have happened. This can thus lead to mismatches at other points in the DNA profile.

When both possible grandparents are tested or in a dual grandparent DNA test, conclusive findings are achieved in more than 99% of the cases.

How to read Grandparent DNA test results?

Specific DNA segments that are inherited straight from one grandparent and are not influenced by mixing from another grandparent are examined by grandparent DNA testing. The degree of DNA matching between the grandchild and the possible grandparent will be displayed in the test results, suggesting the possibility of a link. The inherent genes from the grandparents are separated in the lab and then compared to their DNA. The inherent DNA markers are then compared, and the probability percentage is derived. 

 A grandparent link is highly likely when there are more than 1,000 centimorgans of shared DNA. To ascertain the definitive proof of a grandparent link, the whole report from the testing business, like Choice DNA, should be examined for precise numbers and chromosomal data.

Reasons to take Grandparent DNA test.

Many grandparents worried they may not be the children’s biological grandparents to start this test! They only want to know the truth because they are afraid. Being grandparents means providing long-term emotional and financial support, and they want to know for sure if their grandchild’s paternity is in doubt. Verifying a biological tie may be desired for legal reasons and mental peace of mind. More reasons include concerns like 

  • Health issues
  • Potential father’s death
  • custody concerns
  • Concerns about inheritance and legacy

Can a Grandparent do a DNA test on a grandchild?

Testing grandparents is one way to determine paternity. Using a DNA test to establish paternity can be difficult for some families, especially if the putative father is unavailable for testing or refuses to give a sample of their DNA. If you utilize a lab specializing in this testing, you can do a grand parentage test. In the absence of a potential father, a grandparent can step in and challenge the child’s paternity. A grandparent DNA test answers all their doubts and questions that can secure the rights of grandparents as well as the future of the child. 

A grandparent test can establish the child’s paternity by determining whether the kid being tested is linked to the paternal grandparents. When paperwork is unavailable, this test can also be used to identify the paternal or maternal grandparents.

Grandparent DNA testing to establish family relationships:

Have you ever been curious about your family name’s beginnings and past? Many are curious to trace their ancestry back through the years and learn the tales hidden beneath their surnames. While conventional genealogical research can yield helpful information, Grandparent DNA testing is another effective method that can assist in solving the mystery around your family name. DNA testing may help you learn more about your ancestry and get insight into your family name history in this post.

For someone who has been looking for his family ties all his life, a DNA test proves to be a key to all the unsolved heritage problems. Grandparent DNA tests can answer the question of family heritage, family lineage, and medical mysteries. Grandparent DNA testing can be an essential tool for solving family tree issues to heritage rights. 

 Best Grandparent DNA test.

We create a DNA profile for every test taker using the mouth swab samples that we obtained. Next, we assess the possibility of a link by comparing the DNA profiles. Possibly, the people in this instance are biologically linked as grandparents and grandchildren. Whether or not you are just starting to build your tree, ChoiceDNA is designed to enrich your total genealogical experience. You can link your matches to your grandparents or grandchildren when making your family tree and heritage a little clearer.


An exact method of determining biological ties and providing answers to inquiries about family ancestry is through grandparent DNA testing. These tests provide evidence of grandparent-grandchild links in over 99% of cases. Tests can verify if probable grandparents have the anticipated genetic relationships by looking at the DNA segments handed down. Grandparent DNA testing offers a dependable response for individuals looking for information on ancestry and inheritance.


Can a grandparent DNA test be done without the parents?

Yes, parents do not need to be tested for grandparent DNA testing. They directly examine the DNA sequences inherited from a grandparent to ascertain a link.

Can only one grandparent do the DNA test? 

DNA Worldwide advises testing one parent and both grandparents to get the most reliable results. We are aware that this isn’t always possible, though. Finishing the DNA test with just one grandmother and one kid is possible.

May 2024