Sibling DNA Test

Cellmark provides confidential, conclusive, court approved DNA sibling testing to members of the public, local authority Children's Services teams, government departments and the legal profession.

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DNA Sibling Testing


Next Day Sibling DNA Test Results

As with all of our DNA relationship testing services we offer a 'Next Day DNA' service, as standard at no extra cost. This means that if all the DNA samples for your test arrive at our UK testing laboratory before 10am, we aim to send the test result to you by the end of the next working day by email.

DNA Testing Information


Arranging Testing and DNA Sampling

You can complete your sibling DNA test registration online or by calling our Customer Services team. Cellmark will assist with arranging appointments for DNA samples to be taken. You can use:

  1. Our dedicated nationwide mobile sampling service
  2. Your own GP
  3. A GP from the list we supply

At the sample collection appointment a mouth swab will be rubbed gently and painlessly on the inside of the mouth to collect a sample of cheek cells.

Sampling Information

Maternity DNA Test Sample
Ministry of Justice, UKAS, SGS and Cyber Essentials Plus Logo


UK Accredited Laboratory

As a member of the Ministry of Justice's list of accredited bodies, Cellmark is accredited to carry out parentage tests directed by the civil courts in England and Wales under section 20 of the Family Law Reform Act 1969. Our laboratory in Abingdon, Oxfordshire is accredited to ISO 17025. Cellmark is a UKAS accredited testing laboratory No. 2045 and is certified to ISO 9001, ISO 14001 and ISO 27001 international quality standards.


Further Sibling DNA Testing Information

Siblings are brothers and/or sisters. Full-siblings have the same mother and father, while half-siblings share only one parent. A sibling test can be used to confirm whether two, or more children are related and to identify if they share one or both biological parents.

Sibling analysis is not as conclusive as paternity testing and can only report the most likely relationship ‘given the DNA evidence’. The results will provide a statistical likelihood of whether two individuals are true biological relatives, but sibling analysis cannot provide a conclusive result. However, if either of the parents of the siblings who are being assessed are available for testing, this will aid the analysis and may increase the certainty of the result.

Cellmark provides a fast court approved service without compromising accuracy and quality, giving you the reassurance that your testing is in good hands. Our prices start from £324 (+VAT).

Our testing prices include the following - as standard:

  • All sampling kits and the cost of sending them to UK sampling locations.
  • Pre-paid return envelopes to safely transport the samples to our laboratory.
  • The cost of testing the samples once they have been received at our laboratory.
  • Our standard 'Next Day' turn around time.
  • The cost of producing and delivering the final test report.
  • Our advice service for the duration of the case accessible via email, Freephone and our web Chat service.

Please note, in addition to the DNA testing cost, you will also need to pay to have the DNA samples taken. Our customer services team can provide full details on how the sampling process works and the costs involved.

Read all our DNA testing FAQs


Home Sibling DNA Testing

In addition to legal or Court approved sibling testing we also provide a 'peace of mind' or 'curiosity' home testing service. Please visit our home DNA testing website for more information and to purchase one of our home DNA test kits. 

Home DNA testing

DNA at Home - Home Sibling DNA Testing from Cellmark