Order DNA Sibling Test Kit NowTwin Zygosity DNA Test

Peace of Mind Twin Zygosity DNA Test kit just £29*

The Twin Zygosity DNA test for twins establishes whether applicants are identical twins, fraternal twins or siblings. The price of this DNA test includes two children but you may add more if required at extra cost. Parental DNA samples may also be added if required. If parental DNA samples are provided, paternity and/or maternity can also be determined.

Ordering Your Twin Zygosity DNA Test Kit

We at GTL believe that, once you have collected DNA samples for testing, you should be able to pay for your DNA test when you are ready. This is why we offer you the opportunity to purchase a DNA testing kit now for the low price of £29 and pay the laboratory processing fee at a later date when you return your DNA samples for analysis and testing.

Peace of Mind Twin Zygosity DNA Testing Kit £29*

Order your home Twin Zygosity DNA test kit for £29 and pay the laboratory processing fee when you return your DNA samples for analysis. Our Twin Zygosity DNA test laboratory processing cost is £110 and includes DNA testing of two applicants. See the information box below for full details. Additional children or a known parent may be tested at an extra cost of £70 each.

*Why so cheap? Click here to find out more about our cheap paternity tests

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Our Twin Zygosity DNA Test Includes:

  • Discreet packaging marked ‘Private & Confidential’

  • DNA testing of two alleged twins

  • Our Premium Quality Twin Zygosity Test using 16 genetic markers

  • Confidential DNA test results in 5 working days
  • Check your DNA test progress online and view your DNA test report when ready (see above for more information)

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Simple. Accurate. Affordable. Guaranteed. Call us on 0333 300 3130 Now

Order securely online or call our Customer Service team on 0333 300 3130
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Step 1

Step 1: Choose Your DNA Test

Informational DNA Test
A 2-person peace of mind twin zygosity test. The cost of the service includes two alleged twins or siblings. You may add more as needed, for example a third child or known parent.
  1. Mouth swabs or blood samples?
    Learn about each
  2. Will the mother also be tested?
  3. Additional participants?
  4. Add optional rush processing:
    Full explanation of rush processing can be found below.
Add to Shopping Cart

Step 2

Step 2: Check Shipping Information

Please take a minute to read the important information below:

All home DNA testing kits are sent in plain, discrete packaging marked ‘Private & Confidential’. There is no return address, no company name and nothing to show what is inside.

For home DNA test kit orders within the United Kingdom:

You will be asked to select how you would like your DNA testing kit sent to you.

Royal Mail 1st class should take 1 working day to reach you but is not guaranteed and may take longer. 

Recorded Delivery 1st class should take 1 working day to reach you and requires a signature on delivery. We will be able to provide a tracking number if required. Please note that Recorded Delivery is not guaranteed and may take longer to reach you.

Special Delivery is guaranteed for delivery before 1pm the following working day but is not guaranteed for delivery on a Saturday. We will be able to provide a tracking number if required.

If you would like your order sent by a courier service, please email us or call one of our Customer Service Advisors for a quote on 0333 300 3130.

For home DNA kit orders outside the United Kingdom:

You will be asked to select how you would like your DNA testing kit sent to you.

Royal Mail Airmail should take three days to Western Europe, four days to Eastern Europe and five days for the rest of the world.

Airsure mail receives priority handling in the UK and abroad, making it faster than the normal Airmail times. However, it is not a guaranteed courier service.

If you would like your order sent by Federal Express or another courier service, please email us or call one of our Customer Service Advisors for a quote on 0333 300 3130.

When home DNA test kits are shipped:

All orders received by 4pm GMT Monday to Friday will be dispatched the same day. GTL do not dispatch or receive DNA kits at weekends or on public holidays.

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Step 3

Step 3: Rush Processing Options and Surcharges


  • 24-Hour Release: £350
    One working day from receipt of samples at our laboratory

  • Two Day Release: £180
    Two working days from receipt of samples at our laboratory
  • Three Day Release: £130
    Three working day from receipt of samples at our laboratory

  • Four Day Release: £80
    Four working days from receipt of samples at our laboratory

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Step 4

Step 4: Complete Guide to DNA Testing


Check our complete guide to DNA testing, paternity test and genetic testing services, fees and refund policy.

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Step 5

Step 5: Additional DNA Testing and Sampling
Information

Information about how DNA samples are collected, the differences between legal DNA testing and informational (peace of mind) DNA tests, buccal mouth swab samples versus "pin-prick" blood sample collection and more is available here.

Find out more about what is required with legal paternity testing, court ordered DNA tests, CSA DNA test and immigration DNA testing.

We understand that finding the answer is very important. Discover the benefits of our paternity test and DNA testing.

Release of DNA Test Results

DNA test results will be available to download from this website 5 working days after we receive the DNA samples, completed form and payment of the laboratory processing fee.

Peace of mind DNA results are also available by telephone, email or post for an additional administration fee, currently £5 for telephone, £10 for email and £15 for first class post.

For legal DNA tests, one copy of the notarised test results and supporting documentation will be posted to you, or a designated recipient, as per your instructions. They may also be emailed or telephoned at no extra cost. Further notarised copies are available at an additional cost of £50 each.

Rush Analysis of DNA

If yours is a more urgent case and you require a faster turnaround time, we provide a Rush Processing service at additional cost, please see below for full details

Other Sources of DNA

Should you find you are unable to provide a mouth swab sample, or do not wish to concern or upset your child by collecting a DNA sample in this way, we are able to extract DNA from a variety of other sources at additional cost. These alternate sources include hair, nail clippings, chewing gum, cigarette butts and clothing. Please click here for full details of other DNA sources we can work with, prices and success rates.

Please do not hesitate to call one of our Customer Service Advisors on 0333 300 3130 or email us for more information.

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GTL Refund Policy

All sales are final. If DNA test services are cancelled before shipping and/or handling a £29 refund processing fee will be deducted.

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Interested in our other DNA Testing and Paternity Test Services?

Review a complete guide to our services, fees and refund policies.

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Twin Zygosity DNA Test

Quality is Assured. Find out why AABB and ISO 17025 Accreditation is important to you. LiveZilla Live Chat Software We're Accredited by the Ministry of Justice
We're an ISO 17025 Accredited Facility
We're accredited by internationally respected A2LA
We're an Accredited Testing Laboratory All Around the World
We're AABB Accredited for Parentage Testing
We're Accredited by the National Association of Testing Authorities
We're a CLIA Accredited Laboratory
We participate in CAP's Proficiency Testing Program
Our Kits Contain FDA Approved Components
We Self-Certify Compliance with SafeHarbor
We participate in the BBB Online Reliability Program
We are an accredited business with the Better Business Bureau
We're the founders of a Fire and Law Enforcement Training Resource
Discover your GeoGenetic Roots with Ancestral Origins Ancestry testing

Consent is required from each person being tested before a sample can be taken. In the case if minors, individuals suffering from a mental disorder or those who are not in a position to give their own consent, a legal guardian or a person having parental responsibility for the individual must consent. Under the Human Tissue Act it is a criminal offense to take a sample from someone to test their DNA without their consent, except for medical purposes and lawful investigative purposes, for example a criminal investigation. Click here to view Department of Health Human Tissue Act 2004 information.
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