Uses of a Twin DNA Test

You might think it obvious: identical twins look the same whilst non identical twins look different. However, physical characteristics and facial features are not enough to scientifically ascertain whether the individuals are dizygotic or monozygotic. Sometimes, non identical twins can be indistinguishable. Here are some common reasons why people choose our twin DNA testing service.

Clients are curious to know with 100% certainty if twins are identical or otherwise in cases where any difference in appearances between the twins is imperceptible.

Clients sometimes have medical reasons for a twin zygosity test. Monozygotic twins have the same carbon copy of each other’s DNA profiles. For this reason they have the same blood groups which make them perfect blood donors to each other.

Further to this, the fact that identical twins are formed from the same genetic material means that they also share the same antigens. If identical twins donate organs to each other, the chances or transplant/organ rejection (the process where by the body of the receiver attacks the newly implanted organ) are lower because of the organ similitude between the donor and the twin receiving the organ (identical twins share the same HLA antigens which means the implanted organ is not perceived as foreign).

Ordering your Twin Test

Results are ready using standard turnaround time in 5- 7 working days.  Once we have processed the order, we will dispatch the kit to our client’s chosen address. The DNA sample collection kit will contain 4 mouth swabs per twin. You will need to rub the mouth swabs under the tongue and against the inner cheek. Once we have the samples at the laboratory, we will compare the twins’ DNA profiles to establish whether they are identical or fraternal.

We can only guarantee standard result turnaround time when testing takes place solely using oral swab samples. Using a discreet sample for your test may lead to an increase in turnaround time.

Understanding Twin Zygosity

To understand more about twin zygosity and twin conception in mammals, refer to our glossary terms for identical twins and fraternal twins.


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