Legal DNA testing for court use in the UK and Ireland
A practical guide for solicitors and social workers. What separates a legal DNA test from a home kit, how many markers to expect, and how testing is arranged for family, care and immigration matters.
The distinction that matters
Legal versus "peace of mind" testing
Not every DNA test is suitable for court use. The analysis itself may be identical, but suitability turns on how the samples were obtained and documented. Whether evidence is admitted is always for the court to decide. There are two broad categories:
- Peace of mind testing — samples are self-collected at home. The result answers a private question but cannot be relied on as evidence, because there is no independent proof of who was actually tested.
- Legal testing — identities are formally verified, samples are collected by an independent professional, and a documented chain of custody accompanies the sample from collection to report. This is the form designed for court-directed and official use.
For any matter that may reach a court, a tribunal or a public body, use a legal test. NIVHA provides legal, chain-of-custody testing only — our process is the same professional standard for every case. Tell us at the outset which court or authority the result is for, as each can set its own requirements.
What makes a result suitable for court use
Three elements make a DNA analysis suitable for use as evidence:
- Verified identity. Every person tested presents photographic identification, which is checked and recorded by the collector.
- Independent, witnessed collection. A trained, impartial collector takes the sample — a simple mouth swab — so there is no question of who provided it.
- Documented chain of custody. Each sample is sealed, labelled and tracked, with every handover recorded, so the report can be traced end to end. See chain of custody explained for the full process.
Why the number of markers matters
A DNA relationship test compares specific locations on the genome, known as markers or loci. A larger marker set can add statistical weight, particularly in complex cases.
Through ISO 17025 accredited laboratory analysis, NIVHA tests up to 68 markers. This helps most in complex cases: where the two possible fathers are closely related, a larger marker set provides additional discrimination.
Up to 68 markers analysed
A larger marker set that helps in family and safeguarding cases, including more difficult scenarios.
Types of legal DNA test
Paternity is the most common instruction, but relationship can be established in several ways depending on who is available to test:
- Paternity — the alleged father, the child, and ideally the mother.
- Maternity — used less often, for example in assisted-reproduction or adoption matters.
- Grandparent testing — where the alleged father is unavailable, testing his parents can establish the relationship.
- Siblingship — determines whether individuals share one or both parents.
- Immigration DNA — to evidence a claimed family relationship for a visa or settlement application.
Our guide on DNA relationship testing beyond paternity explains the indirect tests in more detail.
How solicitors instruct a test
We have made instruction straightforward. A solicitor or social worker can request a fee note online, and we handle the rest — arranging verified collection, managing the chain of custody, and returning a report prepared for use in proceedings.
- Collection where it suits you. In Belfast, by appointment in Derry~Londonderry, in Dublin city centre, or we come to you.
- Clear, itemised fees. A fee note is generated in minutes, so you know the cost before you commit.
- Clear reporting. Results are presented in a format prepared for use in legal proceedings.
This page is a general guide. It is not legal, medical or technical advice. Laws, guidance and laboratory methods change, so check the current requirements for your own case. Last reviewed .
Common questions
Legal DNA testing — your questions answered
What makes a DNA test suitable for court use?
A legal DNA test is designed for court use. It relies on a documented chain of custody: identities are formally verified, samples are collected by an independent, trained professional, and every step from collection to report is recorded and tamper-evident. A home or "peace of mind" kit, where samples are self-collected, does not meet this standard and is not suitable for court-directed or official testing. Whether evidence is admitted is always for the court to decide.
How many DNA markers are analysed?
Through ISO 17025 accredited laboratory analysis, up to 68 markers are examined. A larger marker set can help in complex cases, for example when the two possible fathers are related.
Who can instruct a legal DNA test?
Solicitors and social workers most commonly instruct legal DNA testing — in family proceedings, care and safeguarding matters, and immigration cases. Individuals can also instruct a legal test where a formal result is needed, for example to correct a birth record. We arrange collection and produce a report prepared for use in proceedings.
What if the alleged father is not available?
Relationship can still be established indirectly. Grandparent, aunt and uncle (avuncular), siblingship and other family-relationship tests can determine parentage when the alleged father is deceased or unavailable. See our guide on DNA relationship testing beyond paternity for how these work.
How are samples collected for a legal test?
Collection is by a simple, painless mouth (buccal) swab, taken by an independent collector who verifies photographic ID and documents the process. For solicitors we can arrange collection in Belfast, by appointment in Derry~Londonderry, in Dublin city centre, or attend your office where needed.
Instruct a legal DNA test
Get a quote in minutes, or talk to us about a case. We arrange verified collection across Northern Ireland and Ireland, and come to your office where needed.