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Sibling DNA Testing

Sibling testing is the ideal DNA test to establish if you are full siblings, half siblings, or unrelated. The test is available as an appointment at one of our DNA Clinics. Or you can order a sibling DNA test kit for free from our online store. Also, the sibling test is available as a ‘peace of mind’ or Legal sibling test. As a result, the latter option will provide you with court admissible DNA test results.

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How does a Sibling 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 sibling test is that biologically related individuals should have more DNA in common than unrelated individuals. Therefore, on average the numbers from full siblings will match at more DNA locations than half siblings. In turn, half siblings will match at more than unrelated people.

Frequently Asked Questions

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

The average analysis time in the lab 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 Sibling DNA Test?

Here are the options available to you:

  • Order a free sibling test from DNA Clinics*
  • Call 0800 988 7107 to make an appointment at a DNA Clinic or order a *DNA self-collection Home Kit
  • Call 0800 988 7107 to arrange a home visit from a sample collection officer
  • You or your solicitor can contact us to organise a legal sibling DNA test for court purposes

* 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 Sibling DNA Test?

The result of a sibling 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 full or half siblings, or completely unrelated.

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

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 sibling 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.