How to register

If you are a parent or guardian of twins please use the junior registration form.

If you are under 18 we require your parent or guardian to register you and your twin. Please use the junior twin registration form.

If you are 18 and over you are able to register yourself and your twin. Please use the adult twin registration form.

To register by phone, please call us on 1800 037 021 (free call Australia wide).

We will send out a welcome pack to all newly registered pairs; if you do not receive a confirmation phone call from us and a welcome pack please let us know at: This email address is being protected from spambots. You need JavaScript enabled to view it. or freecall 1800 037 021.

Why do we need twins?

We all know that twins are special but many don’t realise the significant contribution they can make in the worldwide fight against many medical conditions such as asthma, diabetes and heart disease – and just how easy it is for twins to be involved and to make a real difference.

The Australian Twin Registry (ATR) was established in the late 1970's to serve as a link between researchers and twins and multiples who are interested in getting involved in research projects.  With over 70,000 members the ATR has become the largest volunteer registry of multiples in the world. Nevertheless, this still only represents about 10% – 15% of twins in Australia and we need more recruits!

It doesn’t matter how old you are; if you are identical or fraternal, well or ill, boy, girl or opposite sex pair – all are welcome to join. Please note that there is no cost involved; it is free to join the ATR.

How you can help

Twins help us to better understand the impact of genetic and environmental factors on health, disease and wellbeing in a very special way. By joining the ATR you join a very unique group that give back to the community in the easiest and most useful way possible – with your time!

What does being a member involve?

We always have new studies coming up – you may be interested in some and not others and that’s fine – you always have a choice whether to participate or not.

Parents can register their twins as newborn babies.  Children of all ages can join but must be registered by their parents if they are under 18 years of age.

Twins who register with the ATR are placed on our database and are contacted when there is an appropriate study – which is often only once a year.  Your involvement is always voluntary and you can withdraw from a study or the ATR at any stage.  

Common activities include filling in questionnaires and health and lifestyle checks.

All requests to use the Australian Twin Registry are carefully reviewed. Approved projects must satisfy ethical guidelines and be of significant value to the area of proposed research. Information concerning individuals on the Registry is strictly confidential; personal details will not be given out without prior consent.

Our newsletter provides you with information concerning many of the different studies currently underway through the registry. New studies commence every year and, should you register your twins, you will be contacted whenever your twins might be appropriate participants (once the twins are 18, they will be contacted directly). Participation in any study is always voluntary and can be withdrawn at any stage.

Update your details

Please noteif you are already a twin registry member, do not use the registration form to update your details - to update click here. If you are not yet a member of the registry you will need to complete a registration form as per the How to register section above.

If you are pregnant with twins, you cannot register until your twins are born. We do have a free booklet that you may find helpful in the meantime. Please click here for more information.