Trauma is the leading cause of death in those under the age of 45 and the most common cause of preventable death after injury is bleeding. When someone is injured and they lose a lot of blood, they require an immediate blood transfusion.
When a person donates blood, it is typically separated into several components, such as red blood cells, plasma, platelets, and a few others. Injured patients who are bleeding require all of these parts, so it makes sense to use blood that has not been separated. This is called “Whole Blood”.