Choosing to do a DNA test is often a deeply emotional experience, but when it becomes part of a legal process, it can feel even more complex. Whether you’re involved in family court proceedings, an immigration application or a probate dispute, ensuring your DNA test is legally admissible is essential, but the process can often feel overwhelming.
The good news is that it doesn’t have to. If you’re wondering, “What is a legal DNA test?”, we’ve broken down everything you need to know. Whether you’re a legal professional, local authority or an individual looking for clarity, this guide will help you understand the process.
Legal DNA testing
A legal DNA test is used when proof of a biological relationship is required for court proceedings or official applications. To ensure results are accurate, reliable and legally admissible, the testing process must adhere to a strict chain of custody and be carried out by an approved laboratory.
In contrast, a peace of mind DNA test cannot be used for legal purposes because it does not involve the same identity verification procedures, witnessed sample collection or documented chain of custody required by courts and government bodies.
You can learn more about what makes a legal DNA test here and how it differs from a peace of mind test.
What is a legal DNA paternity test?
A legal paternity test is used to confirm a biological relationship between a child and a potential father. It is the most common type of legal DNA test used in family law proceedings relating to child maintenance cases, birth registration matters and other legal applications.
However, when the potential father is unavailable, unwilling to participate or deceased, alternative relationship tests may be used to help establish biological relationships.
At NorthGene™, our legal DNA tests can be used to confirm or exclude a range of alternative family relationships, including:
- Paternity
- Non-invasive prenatal paternity (testing from 8 weeks of pregnancy)
- Maternity
- Siblingship
- Avuncular (aunt/uncle to niece/nephew)
- Grandparentage
When is a DNA test required for court?
Legal DNA testing is commonly used in family law cases where proof of a biological relationship is required. These situations may include:
- Child custody agreements
- Child maintenance disputes
- Child welfare proceedings
- Updating a birth certificate with the father’s name
- Surrogacy cases
- Kinship assessments – particularly for siblingship purposes
- Inheritance or probate disputes
Legal DNA testing can also be used to support immigration applications, including:
- British passport applications based on a family relationship
- Family reunification applications
- Visa applications
You can read everything you need to know about DNA testing for immigration purposes here.
What makes a DNA test legally admissible?
Several important requirements must be met for a DNA test to be accepted by a court or government authority.
Tests must be conducted by an approved laboratory
Legal DNA testing must be carried out by a Ministry of Justice approved laboratory
NorthGene™ is Ministry of Justice approved and Home Office approved. We are also one of only a few laboratories in the UK accredited to UKAS ISO 17025 standards for relationship DNA testing, demonstrating the highest levels of technical competence, quality assurance and confidence in our results.
Chain of custody must be maintained throughout
Secondly, legal DNA testing must follow a strict chain of custody process. This ensures that samples are collected from the correct individuals, identities are verified, and samples remain secure throughout testing. Maintaining chain of custody provides confidence that the results are accurate, reliable and suitable for use in family law.
Without a documented chain of custody, there is no way to prove who provided the DNA sample. Courts and government bodies therefore require legal DNA tests to include identity verification and witnessed sample collection to ensure the results can be trusted.
To achieve this, NorthGene™ works with a nationwide network of DBS-checked and highly trained sample collectors who verify participant identities, witness sample collection and securely return samples to our UK laboratory for analysis. This is carried out with the utmost care and precision by our expert team.
Confidentiality
Strict levels of confidentiality must also be maintained from start to finish.
To protect personal information, NorthGene™ only communicates with the principle contact listed on the registration form unless instructed otherwise. Additionally, test results are issued only to the authorised individuals listed on the form.
Learn more about ensuring a DNA test is legally admissible here.
Legally admissible DNA testing with NorthGene™
NorthGene™ provides legally admissible DNA testing for family law, immigration and civil matters across the UK. As a Ministry of Justice approved and Home Office approved laboratory, we are committed to delivering accurate, reliable results that meet the requirements of courts, solicitors and government authorities.
We understand that legal DNA testing often takes place during important and sometimes challenging life events. That’s why our team is on hand to answer your questions, explain your options and guide you through every step with professionalism, care and discretion.
If you need legally admissible DNA testing or would like advice on the most appropriate test for your circumstances, contact our team today to discuss your requirements.




