Facts you should know
BLOOD TYPE BASED ON OUR PARENTS (19 Feb 2014)


The ABO Blood Group System

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:

  • Group A – has only the A antigen on red cells (and B antibody in the plasma)
  • Group B – has only the B antigen on red cells (and A antibody in the plasma)
  • Group AB – has both A and B antigens on red cells (but neither A nor B antibody in the plasma)
  • Group O – has neither A nor B antigens on red cells (but both A and B antibody are in the plasma)



Blood Types and the Population

O positive is the most common blood type. Not all ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of O’s, while Asian people have a relatively high number of B’s. The mix of the different blood types in the U.S. population is:


Caucasians African American Hispanic Asian
O +
37%
47%
53%
39%
O -
8%
4%
4%
1%
A +
33%
24%
29%
27%
A -
7%
2%
2%
0.5%
B +
9%
18%
9%
25%
B -
2%
1%
1%
0.4%
AB +
3%
4%
2%
7%
AB -
1%
0.3%
0.2%
0.1%

Some patients require a closer blood match than that provided by the ABO positive/negative blood typing. For example, sometimes if the donor and recipient are from the same ethnic background the chance of a reaction can be reduced. That’s why an African-American blood donation may be the best hope for the needs of patients with sickle cell disease, 98 percent of whom are of African-American descent.

The chart should be used as general information only. All health care decisions should only be made with consultation from your physician. Please check with experts before you act.

PARENTS' BLOOD TYPES POSSIBLE CHILD NOT POSSIBLE CHILD
A and A A, O B, AB
A and B A, B, AB, O no
A and AB A, B, AB O
A and O A, O B, AB
B and B B, O A, AB
B and AB A, B, AB O
B and O B, O A, AB
AB and AB A, B, AB O
AB and O A, B AB, O
O and O O A, B, AB

Rh status works in a way similar to Blood type groups. If you are Rh positive, you may have genes for both positive and negative. If you are Rh negative, you have two genes for Rh negative.
In the following chart, the child's Rh factor is in the white area.

Father's Group

Mother's Group

Rh +

Rh -

Rh +

Rh +, Rh -

Rh +, Rh -

Rh -

Rh +, Rh -

Rh -