Type AB is a blood type that is relatively rare and found in less than 5% of the world's population. This blood type is unique because it contains both A and B antigens on the red blood cells, as well as both A and B antibodies in the plasma. There are a few synonyms that can be used to describe individuals with this blood type, including "universal recipient" and "mixed blood type". People with Type AB blood can receive blood transfusions from all other blood types, but they can only donate to other Type AB individuals. Due to its rarity, Type AB blood is always in high demand for blood donation purposes.