The extended ABO blood grouping
| Forward grouping | Reverse grouping | Secretor status | Possible Subgroup | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Anti-A | Anti-B | Anti-A, B | Anti-D | Anti-H | Anti-A1 | A1 Cells | A2 Cells | B Cells | O Cells | |||
| Lectin | ||||||||||||
| Case 1 | 0 | 0 | 0 | 4+ | 4+ | 0 | 0 | 0 | 4+ | 0 | ND | Ael |
| Case 2 | 2+ | 0 | 1+ | 4+ | 3+ | 0 | 0 | 0 | 4+ | 0 | Present of H antigen in saliva | Ax |
| Case 3 | ++MF | 0 | ++MF | 4+ | 4+ | 0 | 0 | 0 | 4+ | 0 | ND | A3 |
Characteristics of weak ABO phenoptypes
| Phenotypes | Forward grouping | Reverse grouping | Other substances present in saliva | ||||
|---|---|---|---|---|---|---|---|
| Anti A | Anti B | Anti H | Anti A | Anti B | Anti A1 | ||
| A3 | ++mf | 0 | 3+ | no | yes | sometimes | A, H |
| AX | weak/0 | 0 | 4+ | 0/weak | yes | almost always | H |
| Aend | weak mf | 0 | 4+ | no | yes | sometimes | H |
| Am | 0/weak | 0 | 4+ | no | yes | no | A, H |
| Ay | 0 | 0 | 4+ | no | yes | no | A, H |
| Ael | 0 | 0 | 4+ | some | yes | yes | H |