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Twin Zygosity DNA Test

Health Street's Twin Zygosity Test determines if twins are fraternal or identical. This test is typically ordered by siblings who were told they are identical as kids, but were never given any scientific proof.

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Twin Zygosity Test

Twin Zygosity Test

Who needs a twin zygosity DNA test?

If you are a twin, but you don’t know for sure if you and your sibling are identical or fraternal, this test is for you. And if you found a long lost brother or sister who was adopted away, but had the same birthday as you, order this test. In the past, the determination of “identical” vs. “fraternal” was not scientific at all. In fact, the doctor typically just made the call at the time of birth based on looks alone. As the years go by, twins who were told they are identical can develop different appearances, and often question that initial judgment of the doctor. This DNA test will settle the question once and for all, providing a completely accurate answer. If you are identical, your DNA will be 100% the same.

How do I schedule a test?

An appointment is required, but scheduling is flexible. Schedule online or call us. Tell us when and where you wish to test, and let us know if the parties will test together, at the same clinic and at the same time, or separately, at different clinics and/or at different times. We can swab the parties in different parts of the country at your request. We’ll send you an email with your appointment information. If the times or locations scheduled in your appointment letter don’t work for you, we’ll make changes, at no charge!

When will I get my results?

Generally, it takes about a week to obtain the results of a twin zygosity test. The signed lab report is emailed to you, and an official hard copy is sent later via US mail, which takes an extra week or two to arrive.

Who determines the results of my test?

After our lab extracts the DNA from your specimens that (the cheek swabs), our geneticists study 21 genetic markers for each person. They perform a statistical analysis to determine the likelihood that the parties are related as identical or fraternal twins. In twin zygosity DNA testing, the results are always conclusive, one way or the other.

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2 Ratings
5.0 out of 5 stars.
Twin Zygosity DNA Test
By Carolyn Ann Cook on September 29, 2017
We Live in a rural area and the Lab Corp had never done the Twin Zygosity test for Fraternal Identical twin question. Some confusion as to if we went to the right lab or not. A phone call was made at the lab we went to (640 W. Washington St, Carson City Nv.) and the paperwork needed was quickly faxed to the lab we were at and the Zygosity test was done there.Thank you,Carolyn Ann
Twin Zygosity DNA Test
By Leigh on March 4, 2016
Very helpful and efficient. Jackson TN. DNA paternity test.

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