Our expert says:
It describes whether or not you have the Rhesus factor, a protein on the surface of red blood cells. If you don't have the Rhesus factor, you're considered Rhesus-negative; if you have it, you're Rhesus-positive. Most people (about 85 per cent) are Rhesus-positive, though it varies by race. So you will be A Positive or B negative etc.
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