ISTH set for Paris surge following disappointment in Washington

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Paris expo signs This way: Around 6,000 delegates are heading to ISTH Congress 2026 Photo Credit: Adobe Stock

A medical association is on track to welcome the highest number of attendees to its flagship congress in a decade after worst-than-expected numbers last year.

The International Society on Thrombosis and Haemostasis (ISTH) is expecting around 6,000 delegates at the ISTH 2026 Congress in Paris, France - 25 per cent more than in 2025, when the event was held in Washington DC. 

What is more, the society said it had received a record number of abstracts for its scientific programme (3,100), which reflected ‘growing engagement’ in the subject matter.

ISTH was expecting around 6,000 delegates in Washington, but in the end had to settle for 4,500 - a number then executive director Thomas Reiser described as 'very low for a truly international congress'.

The numbers expected in Paris appear to confirm the theory that last year's congress was affected by US politics, with delegates choosing to stay away for political reasons or safety fears, rather than a structural decline. 

Speaking to AMI recently, Kevin Hinton, MD for Group Travel at US Travel, said Washington had been affected more than other US cities, due to its role as the seat of government.  

This year's congress will take place at the Paris Expo Porte de Versailles, July 11-15, bringing together clinicians, researchers, scientists, educators and industry leaders from around the world. 

“The ISTH 2026 Congress is excited to convene in Paris, which provides an outstanding setting for scientific exchange and international collaboration,” said Walter Ageno, chair of the planning committee. “We look forward to welcoming colleagues from around the world to what is probably the most dynamic and diverse gathering in thrombosis and hemostasis.”

Among the most anticipated highlights will be the presentation of late-breakthrough abstracts sharing new data from major clinical trials and breakthrough studies. 

The late-breakthrough programme features emerging clinical trial results and first disclosures of important scientific findings that may influence future standards of care. 

Presentations will offer attendees an early look at important scientific developments that have the potential to influence future research and clinical practice.



*This article was amended on July 7th. Previously, the article had referred to a 'dip' in numbers in Washington, which didn't accurately reflect the trend in recent years.

James Lancaster
Written By
James Lancaster

AMI editor James Lancaster is a familiar face in the meetings industry and international association community. Since joining AMI in 2010, he has gained a reputation for asking difficult questions and getting lost in convention centres. Proofer, podcaster, and panellist - in his spare time, James likes to walk, read, listen to music, and drink beer.

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