AB negative – 0.6% If you're interested in knowing breakdowns for other countries, you can check out this chart at BabyMed.com. Since blood type is genetic, some countries will have more of one blood type than another, depending on the ethnic makeup of the country. Knowing your blood type is important because it tells medical professionals which blood you can receive in the event you need to undergo a blood transfusion. Receiving the wrong blood type could result in a life-threatening immune response. People who have the AB positive blood type are called "universal recipients," meaning they can receive blood from people with any blood type (but they can only donate to people with their blood type). People with O negative blood are called "universal donors" as their blood type is compatible with all other blood types (but they can only receive O negative blood). People with O positive blood can donate to other positive blood types (like A positive or AB positive), which is about 80 percent of the U.S. population, making O blood in high demand, whether positive or negative.