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Grandparent DNA Testing

The grandparent DNA test will establish the biological grandparents of a grandchild. The test is available as an appointment at one of our DNA Clinics. Or you can order a grandparent test kit for free from our online store. Also, the grandparent DNA test is available as a ‘peace of mind’ or Legal grandparent test. As a result, the latter option could provide you with court admissible DNA test results.

Grandparent DNA Test main page

How does a Grandparent DNA Test work?

As with a paternity test, a DNA profile is produced for each person. The test analyses different genetic locations on the DNA strand. First, the allele (alternating form of DNA) at each location is identified by a number. Next, the DNA profiles of the test participants are then compared.

The logic behind the grandparent test is that biologically related individuals should have more DNA in common than unrelated individuals. Therefore, on average the numbers from grandparents will match at more DNA locations for their grandchildren.

Frequently Asked Questions

How long does it take for the Grandparent DNA test results?

The average analysis time in the laboratory for the grandparent DNA test is around three to four working days. But this does not include the quality checks needed for sample integrity or your consent paperwork. So, from receipt of your samples at Crystal Health Group, it takes on average of about three to five working days. If there are any unforeseen delays, for example, such as the paperwork we receive not being quite right, we will contact you as soon as possible to let you know.

How do I order a Grandparent DNA Test?

Here are the options available to you:

* Please note, you can only use self-collection kits for peace of mind purposes only. This test cannot be used for legal purposes.

How accurate is the Grandparent DNA Test?

The result of a grandparent DNA analysis is based on statistical calculations. As such, this produces a probability indicating whether two individuals are true biological relatives. The statistical analysis is based on factors such as:

  • The number of matches within the DNA profiles.
  • How likely it is that the same allele would be found at that same DNA location, if testing a random, unrelated individual from the same ethnic background.

These calculations determine the most likely relationship between the individuals tested. This could be a grandparent / grandchild relationship, or unrelated.

Also, you can improve the chance of a conclusive DNA test result for your grandparent test. Please call and speak to a Clinical Advisor who will explain the additional options available to you.

Please refer to the disclaimer on this page for further information.


Due to the science of complex DNA relationship testing and the chance nature associated with DNA inheritance, there is a small risk of an inconclusive result with this test. An inconclusive result means that the DNA analysed and compared between individuals does not provide enough evidence to establish the biological relationship being tested. The risk of obtaining an inconclusive result varies due to several factors including, the test participants available for testing, the individual’s specific DNA profiles and how unique or common they are, and the number of locations on the gene tested.

It is important that you are aware of the risk of an inconclusive result before ordering or booking this test, as you will be signing consent to confirm your understanding and acceptance of this. Refunds will not be issued for inconclusive results.

However, we will always attempt to achieve a conclusive result for your DNA test. As such, there may be further options available to you to achieve this. These are:

  • The addition of other test participants, including the biological mother of the child. Additional costs will apply after any initial testing has taken place.
  • The standard complex tests analyses 23 locations on the gene. It is possible to test a further 20 locations (total of 43), which increases the chance of a conclusive result. There are two options for this:
  1. If the 43 loci test is ordered from the beginning, the additional charge is only £30.
  2. If the 43 loci test is ordered after a standard complex test produces an inconclusive result, the additional charge is £60.

If you are using the DNA Clinics service and booking an appointment, the above options will be explained to you. If you are ordering a self-collection kit, please call 0800 988 7107 and speak to a member of our team about these options before you order a DNA kit.

Local DNA Clinics, and mobile locations throughout the UK

For your convenience, we have a network of DNA Clinics throughout the UK. As a result, we can provide grandparent test appointments for you in your local area. Alternatively, we can arrange for a certified sample collection officer to visit your home or other convenient location of your choice.