Understanding The Background Of Facts About Blood And Blood Types

There are four major blood groups determined by the presence or absence of two antigens– A and B – on the surface of red blood cells. In addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types:
(i) A+
(ii) A-
(iii) B+
(iv) B-
(v) O+
(vi) O-
(vii) AB+
(ix) AB-

Group A

Group B

Group AB

Group O

Blood Type Compatibility

Blood Type Compatibility

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