Can two positives make a negative blood type
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It's often used in medical emergencies when the blood type isn't immediately known. In most cases, O RhD negative blood (O-) can safely be given to anyone. This means you can be one of eight blood groups:Ībout 85% of the UK population is RhD positive (36% of the population has O+, the most common type).
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If it's absent, your blood group is RhD negative. If this is present, your blood group is RhD positive. Red blood cells sometimes have another antigen, a protein known as the RhD antigen. The NHS Blood and Transplant (NHSBT) website has more information about the different blood groups. This is why group A blood must never be given to someone who has group B blood and vice versa.Īs group O red blood cells don't have any A or B antigens, it can safely be given to any other group. For example, if someone with group B blood is given group A blood, their anti-A antibodies will attack the group A cells. Receiving blood from the wrong ABO group can be life threatening. Almost half of the UK population (48%) has blood group O.