How to Do a Paternity DNA Test in England

A paternity DNA test is used to determine whether a man is the biological father of a child. Depending on the situation, the test can be done privately at home or through a legal process in England. The key difference is simple: private tests are for personal information, while legal tests must follow an identity-checked chain of custody so the results can be used in court or for official matters. GOV.UK confirms that DNA testing can be used in disputes involving child maintenance, child contact, inheritance and immigration, and that court-use tests must be carried out by an accredited laboratory.

What is a paternity DNA test?

A paternity DNA test compares the child’s genetic profile with that of the alleged father to determine whether a biological relationship exists. A child inherits half of their DNA from the mother and half from the father, so the laboratory checks whether the paternal markers match as expected. If the genetic markers do not match in the required way, paternity is excluded. GOV.UK describes DNA testing as a method that can either prove that two people are definitely not related or show the probability that they are related.

For a general overview of the process, you can also consult our guide to the paternity DNA test.

How to do a legal paternity DNA test in England

In England, when a paternity DNA test is required for family court proceedings, the process is usually organised through a supervised appointment and most often uses a simple cheek swab. As explained in the Cafcass guidance on DNA testing, the sample collection process is quick and painless, but attendance is expected when the test has been ordered by the court.

What is usually required?

A legal paternity test generally involves:

• the consent of the alleged father

• the consent of the child if the child is old enough to give it

• parental responsibility and appropriate consent arrangements when the child is a minor

• identity verification for each participant

• sample collection under controlled conditions

• full traceability between the participant and the sample

In practice, this means the samples are not taken anonymously. The laboratory must be able to prove who gave each sample. That is what gives the test legal value.

When is a legal test useful?

A legal paternity DNA test may be relevant if you need evidence for:

• family court proceedings

• child maintenance disputes

• inheritance issues

• certain immigration or passport matters involving proof of biological relationship

  
  

Even with a valid DNA report, the final legal effect depends on the authority or court handling the case.

How to do a home paternity DNA test

A home paternity DNA test is the simplest option when you only want a private answer. The samples are usually collected by the participants themselves, most often with cheek swabs, then sent to the laboratory for analysis. This type of test is convenient and widely used for personal reassurance, but it does not normally have legal value because the identity of the participants has not been independently verified. That distinction is consistent with UK government guidance separating personal testing from court-use DNA testing.

For practical preparation, see our step-by-step guide to the DNA test kit.

Can you do a paternity DNA test during pregnancy?

Yes. A prenatal paternity test can be carried out during pregnancy using the mother’s blood sample and a DNA sample from the alleged father. This is a non-invasive method because it relies on fetal DNA circulating in the mother’s blood rather than an invasive procedure. Your site’s prenatal test page states that the analysis is done from a maternal blood draw and a buccal swab from the presumed father.

In practice, timing matters. The test should only be arranged once there is enough fetal DNA in the maternal blood for the laboratory to analyse reliably. If you want more detail on eligibility and timing, read our page on the prenatal paternity test.

Can a paternity DNA test be done after death?

Yes, but this is usually more complex than a standard paternity test. The feasibility depends on the available samples, the condition of the biological material and the legal context. In some situations, an indirect family relationship test may be more realistic than a direct paternity test. Your site’s article on post-mortem DNA testing explains that non-standard samples can sometimes be used when buccal swabs are no longer possible.

Where consent, inheritance or legal proceedings are involved, professional legal advice is strongly recommended before starting the process.

How much does a paternity DNA test cost?

The price depends on the type of test, the number of participants and whether the sampling must follow a legal chain of custody.

In general:

• a private home test is usually the lowest-cost option

• a legal paternity test costs more because identity checks and traceability are required

• extra participants or special samples can increase the price

• shipping and supervised collection may add further charges

Because pricing varies by laboratory and service model, it is better to compare what is actually included rather than focus only on the headline price. A very low advertised price does not always include all participants, reporting or collection requirements.

Who should take part in the test?

The core participants are usually:

• the child

• the alleged father

The biological mother is often optional for a standard private paternity test, but including her can make interpretation easier because the laboratory can distinguish which markers come from the mother and which are left to assess the paternal contribution. In some legal or complex family situations, the mother’s participation may be required or strongly recommended.

If the possible fathers are close relatives of each other, such as brothers or other men from the same paternal line, the case becomes more complex and the laboratory may need additional participants or an alternative testing strategy.

Which sample is used for a paternity DNA test?

Buccal swab: the standard option

The most common sample is a cheek swab. It is simple, painless and suitable for most paternity tests. GOV.UK states that DNA testing usually involves either a blood or saliva sample, and Cafcass notes that a cheek swab is quick and painless in family court testing.

Non-standard samples

In some circumstances, laboratories may analyse other biological material, such as:

• blood

• hair with root

• nail clippings

• used personal items such as a toothbrush or razor

However, non-standard samples are more variable in quality. The main issue is not the theory of DNA testing, but whether the sample contains enough usable DNA to create a reliable genetic profile.

What if the alleged father is unavailable?

If the alleged father cannot be tested directly, another type of relationship test may help assess the paternal line. Depending on the family structure, the laboratory may recommend:

• a sibling DNA test

• a grandparentage DNA test

• an avuncular test with a paternal uncle or aunt

• a Y-chromosome analysis in specific male-line cases

These tests do not answer exactly the same question as a direct paternity DNA test, but they may help clarify biological relationships when direct testing is impossible. Current UK forensic guidance on autosomal relationship testing also recognises the relevance of autosomal and lineage-marker approaches in relationship testing contexts.

Can you do a paternity DNA test without the mother?

Yes, in many cases you can. A private paternity DNA test can often be performed with only the child and the alleged father. That said, including the mother can improve the clarity of the analysis, especially in more complex cases. If the test is intended for legal use, the participation requirements may depend on the circumstances and the laboratory protocol.

Are paternity DNA tests accurate?

Paternity DNA testing is considered highly accurate when performed by a competent laboratory using validated methods. Accuracy depends on the quality of the samples, the number of markers analysed, the laboratory’s procedures and accreditation status. For legal use in England, accreditation is essential. GOV.UK specifically requires accredited laboratories for court-use paternity testing.

To understand why accreditation matters, see the official GOV.UK guidance on accredited DNA testing and our article about DNA test accreditation.

Can you get a paternity DNA test from a pharmacy?

Not as a complete legal testing service. In England, a valid legal paternity DNA test must be handled through an accredited laboratory with verified procedures. While some sample-collection materials may be easy to buy separately, the analysis itself must still be carried out by a qualified laboratory if you want reliable and, where relevant, legally usable results.

Conclusion

If you want to know how to do a paternity DNA test, the first step is to identify your goal. If you only need a private answer, a home paternity DNA test is usually the most straightforward option. If you need results for court or an official procedure in England, you must choose an accredited laboratory and follow a documented identification process. Either way, the reliability of the result depends on proper sampling, suitable participants and the right testing pathway for your situation.