A twins test (also called “twin zygosity”), is a DNA analysis that definitively shows whether twins are identical or fraternal.

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During OB-GYN visits, the physician might be able to tell whether twins are identical or fraternal through ultrasound examination of the placenta.

 

There are cases, however, where twins find out much later that a DNA test shows the opposite of what the ultrasound examination determined! Scientists recommend DNA testing to determine zygosity—the degree of similarity.

 

Medical records regarding zygosity may have been lost, or doubt may have arisen because of the twins’ physical characteristics as they age.

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A DNA twin test compares the twins’ DNA profiles to see whether they match—an exact match proves that the twins are identical.

 

The results of a twin zygosity test may be used to satisfy personal curiosity as well as to help solve the twins’ health problems at a later time.

 

For example, in the event that a twin needs an organ or tissue transplant donor, the identical twin is a perfect choice.

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