An example being, a man who has type AB blood could not father a child with type O blood, because he would pass on either the A or the B allele to all of his offspring. In cases of questioned paternity, ABO blood-typing can be used to exclude a man from being a child's father. Before DNA analysis was available, blood types were the most common factor considered in human paternity testing. Paternity can be determined by highly accurate tests conducted on blood or tissue samples of the father - or alleged father, mother and child. In an emergency, type O blood can be given because it is most likely to be accepted by all blood types. Therefore, it is important that blood types be matched before blood transfusions take place. If two different blood types are mixed together, the blood cells may begin to clump together in the blood vessels, causing a potentially fatal situation. If the blood types are not compatible, red blood cells will clump together, making clots that can block blood vessels and cause death. In a blood transfusion, a patient must receive a blood type compatible with his or her own blood type. The universal plasma donor has Type AB positive blood type.īlood types are very important when a blood transfusion is necessary.The universal red cell donor has Type O negative blood type.In general, Rh negative blood is given to Rh-negative patients, and Rh positive blood or Rh negative blood may be given to Rh positive patients. In addition to the A and B antigens, there is a third antigen called the Rh factor, which can be either present (+) or absent ( - ). Has neither A nor B antigens on red cells (but both A and B antibody are in the plasma) Has both A and B antigens on red cells (but neither A nor B antibody in the plasma) Has only B antigen on red cells (and A antibody in the plasma) Has only A antigen on red cells (and B antibody in the plasma) There are 4 major blood groups determined by the presence or absence of two antigens (A and B) on the surface of red blood cells: Since some antigens can trigger a patient's immune system to attack the transfused blood, safe blood transfusions depend on careful blood typing and cross-matching.
There are eight different common blood types, which are determined by the presence or absence of certain antigens, which are substances that can trigger an immune response if they are foreign to the human body. Blood Type O - If the red blood cell has neither "A" or "B" molecule.Blood Type AB - If the red blood cell has a mixture of both "A" and "B" molecules.Blood Type B - If the red blood cell has only "B" molecules on it.Blood Type A - If the red blood cell has only "A" molecules on it.The frequencies of the ABO and Rh blood types vary from population to population.
#Rh a negative blood type facts series
A series of related blood types constitutes a blood group system, such as the Rh or ABO system.
Many pregnant women carry a fetus with a blood type which is different from their own, which is not a problem.Almost half (48%) of the UK population has blood group O, making this the most common blood group.Your body carries around four to six liters (7 to 10.5 pints) of blood.
#Rh a negative blood type facts skin
Fitzpatrick Scale Skin Type Test and Results.Convert MS Word Docs to Plain Text and HTML.
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