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What is legal DNA testing used for? Common legal scenarios

by | Jul 15, 2026 | Legal & Immigration

If you’ve been told you need a legal DNA test, the first question is often, “Why?” The answer depends on your circumstances. Legal DNA testing is used whenever a biological relationship needs to be verified for official purposes, providing evidence that can be relied upon in legal matters. Whether you’ve been instructed to undergo testing by a court, solicitor or government department, or you’re exploring your options yourself, understanding the reasons behind legal DNA testing can help you navigate the process with confidence.

Birth certificate updates

The decision to add a father to the birth certificate is an important one, providing a child with a complete record of their parentage. The reasons for this change are very personal, and can vary, but the process is governed by specific legal circumstances where paternity needs to be formally established or corrected.

To ensure your application to change or update the birth certificate is successful, the DNA test that you submit must be court admissible. A legal DNA test must be performed by a reputable and accredited laboratory, providing a high level of oversight that a peace of mind DNA test cannot offer.

Read more about the process in our blog.

Family court

Family courts often require clear, reliable evidence when decisions depend on establishing a biological relationship. Legal DNA testing provides independent scientific evidence that can help resolve disputes, support legal applications, and ensure decisions are made using accurate information, in the best interests of the child(ren).

Unlike a peace of mind DNA test, legal DNA testing follows a strict chain of custody process, ensuring the results are suitable for use in court proceedings and accepted by family courts and other legal authorities.

Legal DNA testing is commonly used in cases involving:

  • Child maintenance: to establish paternity when financial responsibility for a child is disputed.
  • Paternity disputes: to confirm or exclude a potential father where parentage is uncertain.
  • Child welfare and custody: to help establish biological connections when they are relevant to decisions about a child’s care or welfare.
  • Kinship testing: to determine biological relationships with other family members, such as siblings, grandparents, aunts or uncles, when a parent is unavailable for testing or further evidence is required.

Surrogacy

DNA testing is also used confirm the relationship between the intended parent(s) and a child born through surrogacy.

In the UK, the surrogate is recognised as the child’s legal mother at birth, regardless of genetic relationship. The intended parents must apply for a Parental Order to transfer legal parenthood from the surrogate to themselves. In some cases, DNA evidence may be required to support this application by confirming the child’s biological relationship to one or both intended parents.

Learn more about DNA testing for surrogacy cases here.

Probate and inheritance

When someone passes away, establishing biological relationships can sometimes be necessary before an estate can be distributed. Legal DNA testing provides reliable evidence that may help resolve inheritance claims and support the administration of an estate by testing for a biological connection between living relatives, and therefore, an indirect relationship to the deceased.

You may need a legal DNA test if:

  • A person dies without a valid will, and a biological relationship needs to be confirmed before inheritance can be determined.
  • Someone comes forward claiming to be a biological child or relative of the deceased.
  • An executor or solicitor requires independent evidence to help resolve an inheritance dispute.

Our legal DNA tests are carried out under strict chain of custody procedures, ensuring the results are suitable for use in probate and inheritance matters.

Immigration

DNA testing for immigration purposes is entirely voluntary, but it can provide valuable supporting evidence when proving a biological relationship as part of an application for:

  • Passports
  • Visas
  • Citizenship
  • Family reunification

Although the Home Office does not routinely require DNA evidence, it may be beneficial when:

  • Birth certificates or other documents are unavailable, incomplete or considered unreliable.
  • You want to strengthen your application with additional supporting evidence.
  • The Home Office or another immigration authority requests further proof of a biological relationship.

A legally recognised DNA test can help support and streamline your application by providing clear, independent evidence of your family relationship.

NorthGene™ is approved by the Ministry of Justice and recognised by the UK Home Office. Our laboratory is accredited to ISO 17025 by UKAS, ensuring every legal and immigration DNA test meets the standards required for court and official applications.

You can learn more about immigration DNA testing in our blog, or watch our video today.

Legal DNA testing with NorthGene™

Whether you need a legal DNA test for a family court case, probate matter, immigration application or another legal purpose, NorthGene™ makes the process as straightforward as possible. We understand that these situations are often sensitive and time-critical, which is why we’re committed to providing accurate results, clear guidance and expert support every step of the way.

As a Ministry of Justice approved provider and a UKAS accredited laboratory, all NorthGene™ legal DNA tests are carried out under a strict chain of custody process with samples taken by trained sample collectors, ensuring the identity of each participant is verified and the integrity of every sample is maintained. This means your results are suitable for use by courts, solicitors, government departments and other legal authorities. Once samples arrive at our UK-based laboratory, we provide results the next working day, helping you move forward as quickly as possible.

From your initial enquiry through to receiving your results, our experienced team is on hand to answer any questions and guide you through the process with professionalism, discretion and compassion.

If you’re unfamiliar with legal DNA testing, you can also read our guide explaining what legal DNA testing is and how it works before registering your test.

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