Home » Blood » How Is My Blood Type Determined?

It’s inherited. Like eye color, blood type is passed genetically from your parents. Whether your blood group is type A, B, AB or O is based on the blood types of your mother and father.

This chart shows the potential blood types you may inherit.

 
Parent1 Parent2
AB
AB
AB
B
AB
A
AB
O
B
B
A
B
A
A
O
B
O
A
O
O
Possible Blood Type of Child
O
    
X
X
X
X
X
X
Possible Blood Type of Child
A
X
X
X
X
 
X
X
 
X
 
Possible Blood Type of Child
B
X
X
X
X
X
X
 
X
  
Possible Blood Type of Child
AB
X
X
X
  
X
    
Source: Americasblood, RedCross
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