Rh blood type checks for the Rh antigen (also called the Rh factor) on red blood cells. Serious transfusion reactions are rare today because of blood type tests. 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. If your red blood cells have: The A antigen. 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. But, about 3 in 20 people do not have rhesus antibodies and are said to be 'rhesus negative'.Blood type tests are done before a person gets a blood transfusion and to check a pregnant woman's blood type. This means they have rhesus antigens on their red blood cells. There is no evidence that people with different blood groups should follow different diets. There is some evidence that people of different blood groups may be more or less susceptible to certain diseases - for example, blood clots in the blood vessels (thromboembolism) and malaria. People who don't have either (blood group O) are still just as healthy. It is not known what the functions of the A and B antigens are. If you have neither type A nor type B antigens on the surface of your red blood cells, you have anti-A and anti-B antibodies in your plasma.If you have type A and type B antigens on the surface of your red blood cells, you do not have antibodies to A or B antigens in your plasma.If you have type B antigens on the surface of your red blood cells, you also have anti-A antibodies in your plasma.If you have type A antigens on the surface of your red blood cells, you also have anti-B antibodies in your plasma.
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