Twin DNA Test (Zygosity Test)

€139.00

• Ireland’s fastest DNA zygosity test
• Just €139 for results in 2-3 days
• 100% confidential service
• Award-winning, accredited laboratory

Zygosity twin testing

A twin DNA test is used to establish whether multiple children from the same birth (such as twins, triplets, quadruplets, etc.) are genetically identical or not. Identical siblings are monozygotic, which means they were formed from a single fertilised egg that went on to split into separate embryos.

Monozygotic twins have the same DNA. Twins that are non-identical from the same birth are known as dizygotic; triplets are trizygotic; quadruplets are quadzygotic; and polyzygotic is the umbrella term for multiple zygotes. These siblings resulted from separate fertilised eggs and share DNA in common, just like siblings from different births.

Why would you need a zygosity twin test?

Siblings that are of different sexes are not identical. By around 2 years of age, zygosity of same-sex twins may be quite clear from their physical features. Growth patterns (such as hair and eye colour, hand and feet appearance) can indicate whether or not the children are identical.

It can be interesting to know whether multiple siblings are identical because it may have been unclear in utero. Identical twins don’t always share the same placenta and sac: it all depends on when the eggs splits. Parents would be interested to know this information, and sometimes the twins themselves like to know when they’re older.

Establishing whether multiple siblings are identical can also help assess the likelihood of conceiving twins again: there is an increased risk for women who have had non-identical twins. In addition, some illnesses may affect monozygotic children so you could establish whether both/all children need testing for a particular condition.

Another novel use of a DNA zygosity profile, and which is increasingly in demand, is as a unique gift idea for multiple birth parents or their children.

Just €139 for results in 2-3 days

What does the twin test entail?

Our in-house laboratory uses the most up-to-date testing technology to ensure the reliability of our DNA tests. We offer accredited DNA testing (up to 42 markers) and retest all our exclusion results to ensure accuracy.

Your DNA zygosity test kit is sent direct to an address of your choice using discreet packaging. The kit includes mouth swabs to obtain tiny amounts of DNA from inside each sibling’s mouth. The swab is rubbed gently and painlessly on the inside of the cheek. There is no need to worry about needles.

We examine specific markers present in repeat sections of DNA from each sibling. These Short Tandem Repeat (STR) loci include the Amelogenin (gender) locus. The DNA seen at each of these STR loci is compared between the tested siblings to determine zygosity: monozygotic twins will share the same DNA profile whereas dizygotic twins will have different DNA profiles. A DNA profile is produced for each of the samples provided. Order Ireland’s fastest, most accurate twin DNA test online now for only €139 with results in 2-3 days.

Order the fastest twin DNA test in Ireland, from our award-winning laboratory