Your blood type depends on the genes you inherit from your parents. In the UK, around 85% of the population are RhD positive. People who have the RhD antigen are RhD positive, and those without it are RhD negative. Whether someone is RhD positive or RhD negative is determined by the presence of the rhesus D (RhD) antigen. This is a molecule found on the surface of red blood cells. Each of these blood groups can either be RhD positive or negative. There are several different types of human blood, known as blood groups, with the 4 main ones being A, B, AB and O.
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