Summary of the screening results from the P1/P2 genotyping of 208 blood donors at position 42 in the novel A4GALT exon 2a
| Phenotype . | Polymorphic site . | Total (n = 208) . | ||
|---|---|---|---|---|
| C/C . | C/T . | T/T . | ||
| P1 | 57 | 93 | 1* | 151 |
| P2 | 0 | 0 | 57 | 57 |
| Phenotype . | Polymorphic site . | Total (n = 208) . | ||
|---|---|---|---|---|
| C/C . | C/T . | T/T . | ||
| P1 | 57 | 93 | 1* | 151 |
| P2 | 0 | 0 | 57 | 57 |
This sample was very weakly positive for P1 antigen by serologic routine methods, but the donor was unavailable for repeat sampling to investigate the discrepant result. However, a flow cytometric semiquantification of P1 antigen on his RBCs was performed and confirmed the serologic typing, although the P1 level was the lowest encountered in the study (data not shown).