On demand webinar:
Understanding chorionicity and determining zygosity

Discover more on chorionicity and its role in determining zygosity.

With an Australian study finding that nearly a third of twins were incorrect when asked to identify if they were identical or not, AMBA believes that understanding and determining zygosity may be a matter of curiosity for some parents, but for some multiples it is lifesaving knowledge.

AMBA launched a Multiple Birth Awareness Week (MBAW) campaign in March 2021 with a goal of driving awareness around a misconception when it comes to determining zygosity of multiple birth children. MBAW is a national campaign to raise awareness around, and draw attention to, the unique realities for multiple birth families in Australia - and how advocacy, positive education and engaged communities can contribute to enabling positive health outcomes for families with multiples.

In 2021, the theme for Multiple Birth Awareness Week was “Identical or Fraternal? Testing for zygosity matters”. Zygosity refers to the degree of genetic similarity within each pair of twins; in other words, how similar their DNA is. 

Watch the discussion with Ashlee Tenberge, AMBA Chairperson, and Professor Mark Umstad, AMBA Patron and Director of Maternity Services at the Royal Women’s Hospital in Melbourne, to learn more about zygosity and why testing matters.
You will hear about:
  • how the traditional model of twinning affects zygosity and chorionicity
  • how the 'decision tree' of determining zygosity works
  • the importance of empowering families to have informed conversations with their health care providers

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Watch this discussion