Table 4. Reaction of Red Cell Subgroups with Known Antisera.Subgroup | Patient Red Cells Tested with Known Antisera | Anti-A1 in Serum? |
A1 | 4+ | 4+ | 4+ | No |
A2 | 4+ | 0 | 4+ | Possible (Yes, about 4%) |
A3 | 2+, mixed field | 0 | 2+, mixed field | Possible (exact percentage unknown) |
+ = agglutination (graded 1+ to 4+)
0 = no agglutination