Antigens and Antibodies in ABO Blood Groups
| Blood Group | Antigens on Red Cells | Antibodies in Serum | Frequency, % in US Populations Whites | Frequency, % in US Populations American Blacks | Frequency, % in US Populations Native Americans | Frequency, % in US Populations Asians |
|---|---|---|---|---|---|---|
| A | A | Anti-B | 40 | 27 | 16 | 28 |
| B | B | Anti-A | 11 | 20 | 4 | 27 |
| O | Neither | Anti-A Anti-B | 45 | 49 | 79 | 40 |
| AB | A and B | Neither | 4 | 4 | <1 | 5 |
From Sacher, RA, and McPherson, RA: Widmann's Clinical Interpretation of Laboratory Tests, ed 11. FA Davis, Philadelphia, 2000, p. 268, with permission.