Based on the minute variations that flow through our veins every second of every day, A+, A-, B+, B+, O-, O+, AB+, and AB- blood types can be recognized from one another. This is anything that is invisible to the naked eye.
These minor changes frequently become irrelevant when you are in the hospital and require a blood transfusion or when you have given blood and identified the type of blood you have. Many people discover for the first time that they have a negative blood type during delivery, when a particular therapy is necessary.
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