World Thrombosis Day 2021 Schedule of Events

September 13, 2021

The WTD campaign is hosting a variety of global events and activities leading up to October 13. We invite you to join us in raising awareness of thrombosis throughout the month. See below for the WTD 2021 calendar of events.

Questions about the WTD campaign? Contact the campaign team at We are here to support your efforts!

Wednesday, September 29
2 p.m. (US-ET)

Reddit “Ask Me Anything” (AMA) with Geoff Barnes, M.D.

Join Geoff Barnes, M.D., for an AMA session on Reddit in recognition of World Heart Day. Barnes will answer questions on heart health and thrombosis in the subreddit r/AskScience.

Monday, October 11
2 p.m. (US-ET)
19:00 (BST)

Facebook Live: Ask the Doctor

Co-hosted with Thrombosis UK
Do you have questions on blood clots that you’ve always wanted a doctor to answer? This is your chance to ask them to WTD Steering Committee Chair Prof. Beverley Hunt, O.B.E. Prof. Hunt will answer YOUR questions live during this special Facebook Live co-hosted by WTD and Thrombosis UK.


Tuesday, October 12
11 a.m. (US-ET) / 17:00 (CEST)
WTD 2021 Global Webinar

Registration is now open for the WTD 2021 Webinar on October 12 at 11 a.m. US-ET / 17:00 CEST. Join leading thrombosis experts for a live discussion on “Clotting Risks During Hospitalization: Exploring General Thromboprophylaxis and Special Cases.” The webinar is proudly co-hosted by the ISTH WTD campaign and the Centers for Disease Control and Prevention (CDC). The webinar is free and all are welcome to attend. Pre-registration is required.

Wednesday, October 13
11 a.m. (US-ET) / 17:00 (CEST)
#ClotChat: Top Risk Factors for Clotting: What to Know & How to Treat

Join the largest online conversation about thrombosis on Wednesday, October 13, at 11 a.m. US-ET / 17:00 CEST. for the eighth annual #ClotChat Twitter Chat. Join experts Prof. Beverley Hunt, O.B.E., C. Michael Gibson, M.D., Claire McLintock, M.D., Elliott Haut, M.D., Marc Carrier, M.D., Cecilla Guillermo, M.D., Nicole Kucine, M.D., MS, and Dr. Satya Prakash Yadav for an interactive discussion on Twitter. Moderated by Everyday Health and with media partner Medscape CME, this is an event you don’t want to miss! Learn more here.

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