Fast, Accurate and Reliable DNA Zygosity Testing Within 3 Days for Just £95

What relationship does zygosity testing prove?

Zygosity testing can be used to determine whether multiple children from the same birth, such as twins, triplets and so on are genetically identical or not.

Identical siblings are known as monozygotic. This means that they were formed from a single fertilised egg, which went on to split into separate embryos and that their DNA is exactly the same.

Non-identical siblings are known as dizygotic. This means that they are the result of separate fertilised eggs and that they share half of their genes in common like other siblings.

To book a Zygosity Test please choose from the following options.

There are 3 or less individuals involved in my Peace of Mind Zygosity test

Book a Peace of Mind Zygosity Test

Total Cost to pay: £95 GBP


There are 4 or more individuals involved in my Peace of Mind Zygosity test

Book a Peace of Mind Zygosity Test

Please download and complete the Registration Form below.

The Registration Form is available as either an Acrobat PDF or a Microsoft Word document. Choose whichever is your preference and click the link to download the form.


You can complete the Registration Form by opening the file on a computer and typing your details in the designated fields. Or, if you prefer, you can print the form out and complete it by hand (if so please use a black pen and write in capitals). You can upload the completed document to us by returning to this web page, clicking the button below and attaching your Registration Form.

If you prefer you can send the completed Registration Form by post to:
Client Liaison Team, NorthGene Ltd, The Biosphere, Newcastle Helix, Newcastle upon Tyne NE4 5BX

Still unsure?
Call us on 0191 233 1414 to speak to a member of our discreet Client Liaison team.

More information about zygosity testing

Why would you undertake a Zygosity Test?
There are various reasons why individuals may wish to gain an understanding of their own, or their children’s zygosity status. These may include the following:

  • Their own interest
  • To avoid embarrassment when asked the common question “Are they identical?”
  • To reinforce the need to treat the siblings as individuals
  • To assess the likelihood of conceiving twins again
  • To participate in any research about multiple births
Who needs to be tested?
  • Twins
  • Triplets
  • Quadruplets etc.
Are the Zygosity Test results conclusive?
The results of this test are more than 99.99% conclusive.
Can I obtain support after the test?
Yes, NorthGene work with the Multiple Birth Foundation who supports families which have children from multiple births, or individuals from a multiple birth. They can be contacted using the following information:

The Multiple Births Foundation

Hammersmith House Level 4,
Queen Charlotte’s & Chelsea Hospital,
Du Cane Road,
W12 0HS

T: 020 3313 3519 / 020 8313 3519