Is dextran antithrombotic?

Yes, dextran can have antithrombotic properties. Dextran is a complex carbohydrate polymer that is often used clinically as a blood volume expander or plasma expander. It can help prevent blood clot formation by increasing blood flow and reducing blood viscosity. 

Additionally, dextran can inhibit platelet aggregation, which is a key step in the formation of blood clots. These properties make dextran useful in various medical applications, including as a component in antithrombotic therapies. However, its effectiveness and specific mechanisms can vary depending on factors such as molecular weight and concentration.