When it comes to traumatic injuries, it's a race against time. A person with major hemorrhage can die from blood loss within minutes, so staunching the wound and getting them to a hospital as fast as possible is critical. Bleeding from the extremities can be slowed with compression but what about internal bleeding? In a hospital, internal bleeding can be controlled with the transfusion of clotting agents, such as platelets, but they require careful storage and refrigeration and can't be carried by first responders. As a result, the majority of people who succumb to traumatic injuries outside a hospital die from treatable hemorrhages.