Twin Tests

What is it?

DNA testing can be used to confirm if two individuals are identical or non-identical (fraternal) twins.

What is the difference between identical and fraternal twins?

Identical or monozygotic twins develop from a single fertilized egg that divides and develops as two separate embryos. Identical twins have exactly the same DNA. They will be the same sex and they are more likely to look like each other.

Fraternal or non-identical twins develop from two separate fertilized eggs. Non-identical twins will share on average half of their DNA, similar to the percentage of DNA shared by two siblings who are not twins. Fraternal twins can be the same or different genders.

How are results from twin DNA tests used?

Twin tests are generally performed to confirm whether twins are identical or non-identical.  The test requires a DNA sample from each twin, usually collected using a cotton swab rubbed inside the cheek.

How do I order?

Click Request a Callback and complete the simple form.  One of our representatives will reach out to you.

The following is the basic information we will need to process and schedule your test while on the call:

  • Names of the children and adults who will be involved in the test
  • Current contact information for all parties involved
  • A return address/email for the results
  • A valid credit card for payment


Prices for a twin test vary based on the number of people tested. Our customer service team can guide you to the correct testing based on your individual needs.


After your order is confirmed, our representatives will follow up by phone and/or email to schedule where and when you can have the DNA samples collected. LabCorp has more than 900 company-operated sites in the US, and we have contracts with more than 10,000 locations globally.