There are four blood types: A, B, AB and O (group 0). The difference between them is the presence or absence of antigens in each of the red blood cells. These antigens are proteins cells that produce an immune response when they detect the presence of other antigens that don’t have these Red blood cells. For this reason, when a transfusion is made, it’s necessary to be made with that blood type that has the same antigens. Otherwise, it may cause a reaction to the immune system.
The most important order or representative groups are: A (45%) 0 (43%), B (9%) and AB (3%).
The person that has group A can donate blood to someone with A, AB; B, to B and AB; AB only AB and 0 can give everyone.
The Rh factor must be considered when giving or receiving blood, in addition of the blood group. 85% of the population is Rhesus factor (is Rh positive) and 15% of the population does not have se same and therefore Rh is negative.
Health professional’s advice to always carry some identification data and Rh blood group: card, bracelet or medal. To get it, ask for it if you donate blood or you get an analytical. Generally, during blood donations, a card is sent to the patient with his blood type, but if you’re not a donor and want to know, discuss it with your doctor.
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