| Cold agglutinin test | ||
| Frequency | Percent | |
| Negative (No agglutination) | 157 | 83.5 |
| Positive at 4˚C at 1/8 dilution | 9 | 4.8 |
| Positive at 4˚C at 1/16 dilution | 7 | 3.7 |
| Positive at 4˚C at 1/32 dilution | 6 | 3.2 |
| Positive at 4˚C at 1/64 dilution | 4 | 2.1 |
| Positive at 4˚C at 1/128 dilution | 3 | 1.6 |
| Positive at 4˚C at 1/256 dilution | 2 | 1.1 |
| Total | 188 | 100.0 |