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Twin Zygosity DNA Testing

Family relationship answers you can trust

Fraternal or identical twins?

The importance of determining whether a set of twins are fraternal or identical goes beyond their ‘twin’ appearance. It can also be a factor in paternity. A set of identical twins will share the same father. Unlike identical twins, fraternal twins can have two different fathers. Usually when twins are born, the physician is able to tell whether twins are identical or fraternal by examining the placenta. However, if there is doubt about the determination that was made at the time of birth, a Twin Zygosity DNA test will reveal the truth.

This test compares the twins' DNA profiles to see whether they are a match. If they are an exact match it proves they are identical twins.

  • Zygote is the product of the fusion of an egg and a sperm. The zygote develops into an embryo
  • If a woman releases two eggs and has sexual relations with more than one man during her fertile period she could have twins with two different fathers
  • Fraternal twins can have two different fathers
  • Identical twins cannot have two different fathers

After this experience, I will never use another lab for any test I can run through Alliance DNA. Your customer service is surprising and your turn-around was right on schedule. Thank you for caring about the customer.

Richard T, FL

Thank you so much Donna, I swear Alliance DNA has the very BEST customer service!

Monica L, VA

I ran a maternity test for a child custody situation and was able to find a great collection location near me and get a completed result within the same week.

Elizabeth R, TX

I really appreciate the personal attention provided by the Alliance DNA team. This process is never fun but Alliance made it as simple and easy as it can be.

James J, OR

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Return your sample

Take a quick mouth swab of each participant and mail these back to us using a prepaid mailing label

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Receive your analysis

Our lab will analyze your DNA and send you the report within two business days

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