![]() So they are also checked for a match before giving a blood transfusion. Minor antigens (other than A, B, and Rh) that occur on red blood cells can sometimes also cause problems. Although "universal donor" and "universal recipient" types may be used to classify blood in an emergency, blood type tests are always done to prevent transfusion reactions. Type AB-positive blood is called the "universal recipient" type because a person who has it can receive blood of any type. It is called the "universal donor" type because it is compatible with any blood type. Type O-negative blood does not have any antigens. A transfusion reaction can be mild or cause a serious illness and even death. This is called a transfusion reaction, and it occurs immediately when incompatible blood is transfused. If you get a transfusion that has different antigens (incompatible blood), the antibodies in your plasma will destroy the donor blood cells. have type AB blood, with 1% having AB-negative (AB-) blood and 4% having AB-positive (AB+) blood.īlood received in a transfusion must have the same antigens as yours (compatible blood). About 5% of people (5 in 100) in the U.S. Your plasma does not have antibodies against type A or type B blood. ![]() have type O blood, with 9% having O-negative (O-) blood and 39% having O-positive (O+) blood. About 48% of people (48 in 100) in the U.S. Your plasma has antibodies that attack both type A and type B blood. have type B blood, with 2% having B-negative (B-) blood and 9% having B-positive (B+) blood. About 11% of people (11 in 100) in the U.S. Your plasma has antibodies that attack type A blood. About 36% of people (36 in 100) in the United States have type A blood, with 6% having A-negative (A-) blood and 30% having A-positive (A+) blood. The liquid portion of your blood (plasma) has antibodies that attack type B blood. The ABO test shows that people have one of four blood types: A, B, AB, or O. So the two most common blood type tests are the ABO and Rh tests. The most important antigens are blood group antigens (ABO) and the Rh antigen, which is either present (positive, +) or absent (negative, -). Blood type tests may also be done to see if two people are likely to be blood relatives. Human blood is typed by certain markers (called antigens) on the surface of red blood cells. Interested in finding out what blood type you are?ĭon’t know your blood type? We’ll test your blood when you donate and let you know your type.Blood type tests are done before a person gets a blood transfusion and to check a pregnant woman's blood type. While having O negative blood makes you a universal blood donor, it also means that if you need blood, you can only be transfused with O negative blood. Not only will you help save lives, but you’ll also ensure there’s a good supply of O negative available should you need blood. If you have O negative blood and are able to donate, we encourage you to do so. ![]() What does this mean for those with O negative blood? O negative blood may not be the rarest blood type, but may be critical to a victim’s survival in an emergency. When trauma victims need urgent treatment, there is seldom time to test their blood type, so O negative blood is used. In addition, emergency services, including ambulances and helicopters, may also carry it to keep patients alive while they’re being transported to a hospital. Hospitals need to have it on hand for emergencies. O negative blood is valuable because it can be transfused to anyone, regardless of their blood type. If O negative isn’t that rare, why do blood centers and hospitals always need it? Fewer than 50 people in the entire world population are known to have Rh-null blood. However, the rarest blood type in the world is Rh-null, which is so rare most of us have never heard of it. Is that rare? Only about 1 in 67 have B negative blood, making it rarer. Or to put it another way, about 1 in 15 people have O negative blood. If you have 0 negative blood, you have something in common with about 7 percent of the US population. People with O negative blood often wonder how rare their blood is since it is always in demand by hospitals and blood centers. ![]()
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