Joining the UW Twin Registry

Twins can make an important contribution to research.  You are eligible to participate in the University of Washington Twin Registry if both you and your co-twin agree to participate

If you are eligible, you and your co-twin will be asked to complete a brief questionnaire. You may be contacted to take part in specific studies. Participation in these studies is voluntary.

Frequently Asked Questions about Joining the UW Twin Registry


Did you or your twin already receive an invitation to join?

The invitation sent by email or snail mail contains the link to complete the questionnaire online. Please do not use this form, as we already have your information. If you lost the link and/or your ID number, please send us an email.



To receive an invitation to join the UW Twin Registry, please complete the following form. We will send an email with a link to complete the enrollment survey. We must receive a survey from both you and your twin to enroll you into the Registry.

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For more information, please call the UW Twin Registry at 1-888-223-0868 or email* us at

*We cannot guarantee the confidentiality of any information sent via email