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ABO and Rhesus Blood Groups
- ABO blood groups are the most basic system of blood typing.
- This system divides blood into four groups – A, B, AB and O.
- The other main grouping used is the Rhesus (Rh) system, which is either negative or positive.
- Your blood group is a combination of the ABO system and the Rh system, for example, O negative.
- When a blood transfusion is required, your ABO and Rh groups are cross-matched with donated blood.
- In an absolute emergency anyone can receive O negative blood.
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