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What do you need for a legal DNA test?

by | Jul 16, 2026 | Legal & Immigration

If you’ve been asked to take a DNA test for legal purposes, it’s normal to have questions about what’s involved and what you’ll need before the process can begin. Unlike a peace of mind DNA test, a legal DNA test must follow strict procedures to ensure the results can be used as official evidence. At NorthGene™, we make the process as straightforward as possible, guiding you through every stage so you know what to expect…

Firstly, it is important to note that for a legal DNA test to be accepted for purposes such as court proceedings, visa or immigration applications or birth certificate amendments, strict chain of custody procedures must be followed. The testing laboratory must also be UKAS accredited to ISO 17025 and approved by the Ministry of Justice, like NorthGene™.

Consent

Under the Human Tissue Act 2004, written consent is legally required everyone taking part in the test. It is a criminal offence to take a DNA sample from someone without their explicit consent and understanding. During sample collection, the sample collector will request that you thoroughly read the “Donor Declaration” section of the consent form, ensuring a full understanding.

If a child is under the age of 16, a person with parental responsibility must sign consent on their behalf. This refers to the legal rights and responsibilities a person has for a child and is required to protect the child’s welfare and ensure testing decisions are made appropriately and lawfully.

You can learn more about consent laws in our recent blog.

Independent sample collection

Unlike a peace of mind DNA test, you cannot collect the samples yourself. Instead, to maintain the legal chain of custody, samples must be collected and witnessed by an independent third party. This may include:

  • A member of the NorthGene™ nationwide sample collection network
  • A GP or doctor
  • A registered nurse

Having an independent professional collect the samples helps to verify each participant’s identity and ensures the samples remain secure throughout the testing and analysis process. It also allows for efficient and hassle-free sample collection.

Identification

Participants must provide valid photographic ID at the sample collection appointment, so the collector can confirm their identity. Accepted forms of ID include a passport or a driving licence. For children under the age of 16 who may not have a passport, their birth certificate can be presented.

You will also need to provide two passport-sized photographs of each person being tested. These will be signed by the sample collector to confirm they are a true likeness of the individual. Alternatively, the sample collector can take photographs during the appointment instead. Copies of the identification and photographs are then securely sent to our UK laboratory via email.

Documentation

Along with collecting the DNA samples, the sample collector will complete the required legal paperwork. This includes ensuring the consent forms are completed correctly and signed, allowing the chain of custody to remain intact throughout the testing process. They will also complete their own declaration to confirm that they have taken the sample from you, provided the photographs and certified they are a true likeness of you.

Any missing or incomplete documentation could delay testing, so it is important that all paperwork is completed accurately.

What happens next?

Once your samples and documentation have been received at our UK laboratory, they are checked to ensure all requirements have been met. The samples ae then analysed and a legal DNA report is produced. The results are issued securely within the next working day and can be used for the legal purpose for which the test was requested.

If you have any questions about the process, you can watch our video on legal DNA testing.

Dedicated support

We understand that arranging a legal DNA test can feel overwhelming. Our experienced team is here to guide you through every stage – from booking your sample collection appointment to answering questions about what you need and turnaround times – helping to make the process as simple and stress-free as possible.

Although a legal DNA test involves more steps than a peace of mind test, each requirement is there to protect the integrity of the results. By obtaining consent, verifying identities and maintaining a secure chain of custody, the final DNA report can be replied on by courts, government departments and other official organisations.

If you have any questions, our team is always happy to help. Get in touch today or learn more about our legal DNA testing service here.

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