How to take a sample

What to do when you receive your DNA testing kit

Thank you for ordering your DNA test with us. In this video the Director of Complement Genomics Ltd, the provider of thatDNAcompany® service, offers you some advice on signing the consent form, taking the sample and returning your samples to our laboratory.

  • Step 1

    The contents of the kit are: consent form, labelled sampling swabs, UK prepaid return envelope, communicating with you information letter and the receipt form.

  • Step 2

    Please check the consent form for accuracy and if you are happy with this, please have all participating persons sign where indicated. We cannot process your samples unless we have the consent of all of those taking part in the test. Please see our FAQ’s for information regarding consent for children under 16 years of age. 

  • Step 3

    Please wash your hands before taking the sample and ideally, do not smoke, eat or drink (except water) in the hour before sampling. We also recommend rinsing your mouth with water before collecting the sample.

  • Step 4

    Match the labelled swab to the person being tested and one at a time, snap the seal, take the swab out of the container (do not touch the tip), insert into the mouth, press onto the cheek and rub the swab in a circular motion 8 to 10 times. Place the swab back into the container and press the lid into place.

    For babies and young children, it is sometimes easier to rub the cotton tip between the bottom lip and gum.

  • Step 5

    Please put the swabs and the signed consent form(s) into the prepaid envelope and post! Please retain the receipt form, which contains your case number, just in case you need to contact us.

We have a solution for all your DNA testing needs

If you would like a sibling, grandparentage or aunt/uncle DNA test, then our sister service, dadcheck®silver can help!

Please call to discuss your case with one of our experienced and helpful team members or visit for further information.

DNA Testing Services

Our personal information, at-home DNA paternity test kits are dispatched within the UK by Royal Mail 1st class.

From the time we receive your properly consented DNA samples (day zero), our standard paternity test takes 2 working days or you can pay a little bit extra for fast next working day results!

Order your home DNA test kit online today!

That DNA Company: Extended Services


Do you require a DNA test for legal purposes? (An accredited test)

This is for changing the name on a birth certificate at the Registrars office, Home Office or Passport Office applications, family court proceedings, inheritance disputes or liaison with the Child Support Agency (CSA). As this is a different level of service, please click here to contact the laboratory by e-mail.


Do you require a DNA test to determine other relationships?

As well as testing for paternity (proof of fatherhood), we can also test for other biological relationships such as sibling (full, half or unrelated), grandparent and aunts/uncles. Again, this is a different service and you will need to discuss your case with a member of our team. Please click here to e-mail our laboratory.