Sibling DNA Testing
Confirm biological sibling relationships with a trusted, UKAS-accredited DNA testing service.
Crystal Health offers legal and peace-of-mind sibling DNA testing to determine whether two or more individuals share one or both biological parents. This testing is available through home kits, appointments at sample collection locations nationwide, or mobile visits, with results typically available on the *next working day.
* Returned samples are checked to ensure everything is complete and ready for analysis. If we spot anything that could delay your results, we’ll get in touch quickly to help resolve it.
Why Choose Crystal Health?
- Sibling DNA analysis performed by a UKAS ISO 17025-accredited laboratory
- Laboratory listed on the Ministry of Justice’s approved provider list for court-admissible DNA testing
- Legal sibling test results recognised by family courts, CAFCASS, and legal professionals
- Free inclusion of one known parent in sibling DNA testing to improve result accuracy
- Transparent pricing and split-payment options available
- Nationwide network of sample collection locations and mobile collectors
- Dedicated case management for all appointment based cases
How Sibling DNA Testing Works
Sibling DNA testing compares the DNA of two or more individuals to assess the likelihood that they share one or both biological parents. This type of test may be used in adoption, immigration, inheritance, or personal confirmation scenarios.
How it works:
- Cheek swab samples are collected from each sibling being tested
- Optional: include one known parent to strengthen result accuracy (no additional cost)
- Samples are analysed at our accredited laboratory using advanced DNA profiling techniques
- Results are usually available on the next working day
All DNA testing follows ethical standards and legal consent requirements set by the Human Tissue Act 2004.
Types of Sibling DNA Test
Peace of Mind Sibling Test
- For private reassurance only
- Self-collection or appointment-based sample collection available
- Not suitable for use in legal proceedings
- Available direct from Crystal Health
Legal Sibling Test
- Required for court, immigration, or official documentation
- Includes ID verification and strict chain of custody procedures
- Sample collection must be by appointment at a sample collection location or via mobile visit
Sibling Testing Pricing
- Peace of Mind Sibling testing starts from £149 for self-collection at home. If you prefer to attend a sample collection location, the price starts from £310
- Legal Sibling testing is priced from £425 at a sample collection location, or £450 for mobile collection. Additional participants can be added to any test for £60 (peace of mind) to £90 (legal) per person
- Including one known parent in the test is free of charge
Flexible split-payment options are available. Contact us for more details.
Frequently Asked Questions
How does Crystal Health’s sibling DNA test work?
Sibling DNA testing compares the DNA of the people being tested to assess the likelihood that they share one or both biological parents. Cheek swab samples are collected and analysed in our accredited laboratory, and the results provide a statistical likelihood of full sibling, half sibling, or unrelated relationships.
Do I need parental DNA for the sibling test?
Parental DNA is not required but can improve the accuracy of the results. If possible, including the DNA of one or both parents is recommended.
What is the difference between Peace of Mind and legal DNA tests?
Peace of Mind tests are for personal reassurance and can be done using a home test kit or by visiting a sample collection location. They are not suitable for legal purposes.
Legal DNA tests are used in situations such as court cases, immigration, child custody, or inheritance. These tests follow strict procedures, including ID verification and chain-of-custody protocols, to ensure results are legally admissible.
Legal DNA test sample collection is only available by appointment, either at one of our sample collection locations, your address, or arranged via your solicitor.
How long does it take to receive the results for the DNA Clinics Sibling Test?
Results are typically available on the next working day after the samples are received at our laboratory.
What is UKAS 17025 accreditation?
UKAS 17025 is an international quality standard that confirms the laboratory’s competence and reliability. It ensures your results are produced using validated procedures and are legally admissible if needed.
Can DNA test results ever be inconclusive?
In most cases, DNA testing provides a clear and conclusive result. However, as with all genetic testing, there are rare situations where the DNA evidence does not provide enough statistical certainty to confirm or exclude the relationship being tested.
Inconclusive results are more likely in more complex relationship tests or where a limited number of participants are included. If a result is inconclusive, we will explain what this means clearly and discuss any available options that may help achieve a more informative outcome.
Because the laboratory analysis and reporting process has already been completed, refunds are not issued for inconclusive results.
How accurate are the sibling test results?
The sibling DNA test provides a statistical likelihood of a biological sibling relationship. By analysing 45 DNA markers, the test delivers a higher level of confidence than standard relationship testing, particularly when parental DNA samples are not available. Results are presented clearly to explain the likelihood of a full, half, or unrelated sibling relationship.
What’s the difference between full sibling and half sibling testing?
A full sibling test looks at whether two people share both biological parents, while a half sibling test looks at whether they share only one biological parent. The laboratory compares DNA markers and provides a probability for each type of relationship.
How much does a sibling DNA test cost?
Peace of Mind sibling testing starts from £195 for two people. Appointment-based testing starts from £350, and legal testing from £425. Additional participants cost £60 each for Peace of Mind tests and £90 each for legal tests. Including a known parent is free.
Can sibling DNA testing be used for legal purposes?
Yes. Legal sibling DNA tests are collected under strict conditions with verified ID and a documented chain of custody, making them admissible in court and recognised for immigration or other official uses.
How is privacy and consent handled?
We follow GDPR and the Human Tissue Act 2004. Written consent is required for all participants. Legal tests involve ID verification and chain-of-custody documentation. Your information and samples are kept secure at all times.
Next steps?
We offer nationwide appointments Monday to Friday at DNA Clinics and partner sites.
Call 0800 988 7107 for expert advice or help arranging your sibling test.
Your Sibling Test kit is free — just pay postage. Lab analysis is charged only when you return your samples.
Local DNA Clinics, and mobile locations throughout the UK
Crystal Health provides access to one of the UK’s most extensive DNA sample collection networks.
Appointments are available Monday to Friday at DNA Clinics and approved partner locations nationwide. Mobile collection is also available for added convenience.
Our team will help arrange the most appropriate appointment for your sibling test.
Head Office
Crystal Health Group
The Old Chapel
Manchester
M30 0NG