Welcome to the National Alliance for Thrombosis and Thrombophilia
The National Alliance for Thrombosis and
Thrombophilia (NATT) is a patient led advocacy group dedicated to prevent,
diagnose and treat thrombosis and thrombophilia through research, education,
support and advocacy. Use the links above or our site search feature
on the right to find what you are looking for fast. Do you prefer your
NATT news delivered? Click here to subscribe to our RSS news feed.
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Breaking Blood Clot News
See what others are viewing! These are our most popular website resources:
- A to Z Blood Clot Education Index

- Blood Clot Risk Tool
- Deep Vein Thrombosis Treatment
- National Blood Clot Incidence Map
- Patient Stories
- Thrombophilia Information and Resources
The DVT Numbers are Staggering
Deep Vein Thrombosis (DVT) is a blood clot that usually occurs in the leg, most often on one side, although it can happen in other parts of the body. DVT
afflicts over 380,000 people per year in the United States. If the blood clot dislodges, it can travel to the lungs and cause a blockage known as a pulmonary embolism (PE) or lung clot. Lung clots affect over 530,000 people a year and 300,000, or almost 1 out of 3, are fatal. Click on the map on the left to see DVT statistics for your state.
Know the Signs and Symptoms for Deep Vein Thrombosis and Seek Medical Assistance Immediately - More...
Resources Just For You
Visit our Learn More section for detailed information on symptoms, risks, and treatment options as well as information on rare conditions. Visit our Patient Stories section to read actual patient accounts of their blood clot experience. If you are a medical professional seeking tools and information for your practice visit our For Professionals section to learn more.
Stop the Clot® Education Project
NATT combines the unique perspectives of health care providers, individuals afflicted with clotting disorders and community leaders who are passionate about this health care crisis. NATT’s Medical and Scientific Advisory Board includes nationally recognized experts on thrombosis and thrombophilia.
NATT is working closely with the Centers for Disease Control (CDC), thrombophilia centers, anticoagulation clinics, hemophilia treatment centers and the National Hemophilia Foundation on its Stop the Clot® Education Project, whose components include:
- Stop the Clot Forum
- Stop the Clot Support Groups
- The Clotting Information and Resource Center (CIRC)
- Educational Brochures
- Train-the-Trainer workshops for healthcare professionals
- Regional workshops for healthcare professionals
- Regional chapter pilot
Are You At Risk for a Blood Clot?
View our new stoplight tool for a more in depth look at your risk - click here.
NATT Newsletters
- Air Travel & DVT Issue

- Athletes and Blood Clots Special Issue
- Blood Clots in Children and Young Adults Issue
- Blood Clots and Cancer
- DVT Issue
- INR Home Monitoring Issue
- Venous Stress Disorder Issue
- Women's Health Issue


