What are the 8 types of blood types?
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So, there are eight possible blood types:
O negative. This blood type doesn’t have A or B markers, and it doesn’t have Rh factor.
O positive. This blood type doesn’t have A or B markers, but it does have Rh factor. O positive blood is one of the two most common blood types (the other being A positive).
A negative. This blood type has A marker only.
A positive. This blood type has A marker and Rh factor, but not B marker. Along with O positive, it’s one of the two most common blood types.
B negative. This blood type has B marker only.
B positive. This blood type has B marker and Rh factor, but not A marker.
AB negative. This blood type has A and B markers, but not Rh factor.
AB positive. This blood type has all three types of markers — A, B, and Rh factor.