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All About Blood

Blood Groups and Families

A child’s blood group is linked to their parents. Below are a combination of parent’s blood types, and possible combinations of their biological children. Note: there are some rare exceptions.

Parents	Possible Children
O&O	O
O&A	O OR A
O&B	O OR B
O&AB	A OR B
A&A	O OR A
A&B	O, A, B OR AB
A&AB	A,B OR AB
B&B	O OR B
B&AB	A,B OR AB
AB&AB	A, B OR AB
Rh (D) Groups Parents	Children
+&+	+&-
+&-	+&-
-&-	-

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All About Blood

Blood Groups and Families

Parents

Possible Children

O&O

O

O&A

O OR A

O&B

O OR B

O&AB

A OR B

A&A

O OR A

A&B

O, A, B OR AB

A&AB

A,B OR AB

B&B

O OR B

B&AB

A,B OR AB

AB&AB

A, B OR AB

Rh (D) Groups

Parents

Children

+&+

+&-

+&-

+&-

-&-

-