What Other Relationship and Specialist DNA Tests Does GTL DNA Provide?

GTL DNA (gtldna.co.uk) offers far more than paternity testing. Beyond its home and legal paternity tests, the UK-based provider lists relationship tests (siblings, twins, grandparents, aunts/uncles, MtDNA, Y chromosome, genetic reconstruction), prenatal tests (non-invasive prenatal paternity and baby gender), animal tests (dog, cat, horse and bird), plus health and wellbeing, clinical, ancestry, drug and DNA profile testing. The right test depends on which two people you want to compare and whether you need results for personal information or for legal purposes.

Relationship and kinship tests

These tests use DNA to establish whether two people are biologically related when a direct parent–child test isn't possible or isn't the question. The site lists:

• Sibling DNA test – examines whether two people share one or both biological parents.
• Twins DNA test – confirms whether twins are identical (monozygotic) or fraternal (dizygotic).
• Grandparent DNA test – assesses a biological link between a child and a grandparent, typically when the parent is unavailable.
• Aunt/uncle DNA test – looks at whether a person is a biological aunt or uncle of a child.
• MtDNA test – traces the maternal line, since mitochondrial DNA is passed from mother to child.
• Y chromosome test – traces the paternal line, since the Y chromosome passes from father to son.
• Genetic reconstruction test – pieces together relationships when key individuals are missing, using several relatives' samples.

How to choose: start from the closest available relative. A grandparent test is more conclusive than an aunt/uncle test because the genetic overlap is larger. Lineage tests (MtDNA, Y chromosome) answer "are we on the same maternal/paternal line?" rather than giving a percentage of relatedness.

Prenatal tests

• Non-invasive prenatal paternity test – assesses paternity before birth using a sample from the mother.
• Baby gender test – a prenatal test to determine the baby's sex.

Because these involve pregnancy, confirm with the provider (and your healthcare professional) that the test suits your circumstances and stage of pregnancy before ordering.

Animal tests

GTL DNA also serves pet and livestock owners:

These are useful for breeders verifying pedigree, for owners investigating a health or allergy concern, or for bird keepers who need to know a bird's sex.

Health, ancestry and other tests

• Health & wellbeing – diet and healthy weight, skin care, lactose intolerance, coeliac disease genetic test, genetic predisposition test.
• Ancestry – ancient DNA hub, GPS Origins ancestry test, paternal lineage, maternal lineage.
• Drug tests – hair drug test.
• Other – DNA profile testing, disaster victim identification, surrogacy DNA testing.

What stays the same across the range

The site states its testing uses a 21-loci test in an ISO 17025-accredited laboratory, with home paternity results in 3–5 working days and an express option in 3 working days once samples reach the lab. Home paternity testing starts at £89 with no hidden fees, and payment options are set out on a dedicated page.

Practical next step

Decide first what question you need answered and who can provide a sample — that narrows the list to one or two tests. Then check the specific test page or contact the lab (the site lists a phone number and a callback request) to confirm sample collection, turnaround and whether the result will be accepted for your intended use, such as legal or immigration purposes.