Blood Type Chart 2
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Blood Types
© 2007 American Red Cross, Mid-America—version 2007-Oct-29  #02-0050-MA

What is blood typing?

How did I inherit my blood type?

Blood typing refers to the presence or absence of antigens, or protein substances found on the surface of red cells. Blood groups (A, B,
AB, and O) and Rh types are descriptions of certain antigens. In the
following chart the 4 indicates the antigen is present.

Your blood type is determined by the blood types of your parents.
The following chart illustrates the possibilities for children who have
parents with certain blood type combinations.

Blood type

A Antigen

A-

4

A+

B Antigen

Rh Antigen

4

4

B-

4

B+

4

4

OO+

4

AB-

4

4

AB+

4

4

4

FATHER
o
o
o
a
a
b
ab
ab
ab
ab

Mother
o
a
b
a
b
b
o
a
b
ab

O

B

A

AB

4
4
4

4
4

4