Asker: Bart, 43 years old
Answer
Best,
That 2 points to a subdivision in blood group A. There are further subdivisions within blood group A and B depending on the structures on the surface of the red blood cell. With A you have A1, A2, A3, Ax and Am. So you can no longer really speak of blood group “A”, since people with blood group A1 can react to blood from people with blood group A2 and vice versa.
The most important division in the ABO system can be seen here:
| Antigen | frequency | antibodies |
| A1 | 33% | Anti B |
| A2 | 9% | Anti-B, possibly. anti-A1 |
| B | 8.5% | Anti A/A1 |
| A1B | 2.5% | – |
| A2B | <1% | Possibly. Anti-A1 |
| O | 46% | Anti-A/B/AB |
Answered by
dr. Jasper Verguts
Gynecology Obstetrics
Catholic University of Leuven
Old Market 13 3000 Leuven
https://www.kuleuven.be/
Old Market 13 3000 Leuven
https://www.kuleuven.be/
.