The rate of twinning seems to be growing. And the biggest question is "are they identical?" You need a twin zygosity test to know for certain. There are many reasons to do a Twin Zygosity Test. We list a few of them here.
1
Parent's Curiosity
It is not always conclusive at birth if twins are identical or not. Parents usually have to know for their own reasons. A twin DNA test can answer this question with 100% accurate results.
2
Medical Reasons
If one twin is in need of an organ transplant, the best donor would be his or her identical twi. This reduces the chance of organ rejection. For certainty you should do a twin zygosity test.
3
Conclusively Determining If Twins Are Mono or Di Zygotic
You can't tell by looking at twins if they are Identical or Fraternal. Even your Dr. will use a lab for zygosity testing.
4
Can Help Determine If The Mother May Have Additional Twins
An identical twin test can provide an estimation of the possibility of the mother, or female relatives, giving birth to future sets of twins.
5
Helps The Twins Develope Their Personal Identity
Twin testing will provide the siblings the knowledge if they are identical twins or not will help the twins develop their own identity and assist them in developing strong social skills.
6
Educate Your Family
Family members may rely on sight for thinking they know if the twins are di/di or mono. You can help them learn about zygosity. A great resource is Journey Genetic Testing's Twin Zygosity page.