What are they? How are they decided? What do they mean?
How are Blood Types Determined?
The ABO blood type system classifies blood into 4 types: A, B, AB, and O.
If both A and B agglutinogens are present, the blood is
AB Type Blood
The presence of A type agglutinogens determines
A Type Blood
The presence of B type agglitinogens represents
B Type Blood
The absence of either A or B type agglutinogens determines an
O Blood Type
The presence of absence of an RH (Rhesus D) protein determines whether the blood is positive or negative
Blood Types in the US