Other Pages: FAQ - Twins | FAQ - Twins Genetics | FAQ - Zygosity | FAQ - Triplets | FAQ - Clients | Technical Terms
These questions and answers provide basic information about triplet DNA testing. We also discuss the circumstances where triplet zygosity should be tested.
Listed below is a selection of those questions that are most frequently asked. The Zygosity and Twins sections provide valuable background information for better understanding triplet DNA testing as well.If you
can not find the answer to your question, please
contact us and we'll promptly provide you
with an answer.
What is the difference between twin and triplet zygosity testing?
There are no differences between the two types of tests except for the fact that it might be necessary to test three co-triplets instead of two co-twins. See the twin zygosity FAQ for additional backgound information.
back to topIs it necessary to test all triplets?
Not necessarily. If all triplets are the same sex and each had a distinct placenta (trichorionic), all three triplets can be tested. However, if one of the triplets is a different sex from the other two, then this triplet may be excluded from the testing and it would only be necessary to order a twin zygosity test only.
back to topWhat about Qaudruplets and other higher order multiples?
Spontaneously conceived higher order multiples are very uncommon and there is little data regarding their zygosity or chorionicity.
back to topIs testing available for higher order multiples?
Yes, add $50 each for additional multiple. However, our online order forms will not accommodate greater than triplets, so give us a call to place your order at 1-866-427-1646.
back to topWhat are triplets called who are all identical to each other?
Monozygotic triplets or identical triplets is the best term for a fertilized eggs that splits twice. The probabilities of spontaneous identical triplets are difficult to calculate with any precision but it is very rare.
back to topWhat are triplets called who are all fraternal to each other?
When three separate eggs are fertilized by different sperm, the resulting triplets are referred to as trizygotic.
back to topWhat are triplets called when there is one identical twin pair plus a singleton?
Polyzygotic triplets results when a one of the zygotes from a dizygotic twin pair splits to form two identical twins. The result is a pair of identical twins and a singleton which together comprise the triplets. Triplet DNA testing is particularly useful in clarifying this scenario.
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"Thank you so much for your very prompt results. In our hearts we always felt
the girls were identical because they shared so many recessive traits. After
their birth, we were told they were fraternal based on the fact that the
placenta was fused. After seven years, it's wonderful to have our suspicions
confirmed. Thank you..."