Platelet ABO compatibility
| ABO . | Platelet recipient ABO group . | ||||
|---|---|---|---|---|---|
| AB . | A . | B . | O . | ||
| Platelet donor ABO group | AB | Identical | Major | Major | Major |
| A | Minor | Identical | Bidirectional | Major | |
| B | Minor | Bidirectional | Identical | Major | |
| O | Minor | Minor | Minor | Identical | |
| ABO . | Platelet recipient ABO group . | ||||
|---|---|---|---|---|---|
| AB . | A . | B . | O . | ||
| Platelet donor ABO group | AB | Identical | Major | Major | Major |
| A | Minor | Identical | Bidirectional | Major | |
| B | Minor | Bidirectional | Identical | Major | |
| O | Minor | Minor | Minor | Identical | |
| RhD . | Platelet recipient RhD type . | ||||
|---|---|---|---|---|---|
| Positive . | Negative . | ||||
| Platelet donor RhD type | Positive | Identical | Mismatch | ||
| At risk for RhD alloimmunization | |||||
| Negative | Mismatch | Identical | |||
| No risk for RhD alloimmunization | |||||
| RhD . | Platelet recipient RhD type . | ||||
|---|---|---|---|---|---|
| Positive . | Negative . | ||||
| Platelet donor RhD type | Positive | Identical | Mismatch | ||
| At risk for RhD alloimmunization | |||||
| Negative | Mismatch | Identical | |||
| No risk for RhD alloimmunization | |||||
ABO identical: donor and recipient have the same ABO antigens and antibodies. Major ABO mismatch: donor ABO antigens are incompatible with recipient ABO antibodies. Minor ABO mismatch: donor ABO antibodies are incompatible with recipient's ABO antigens. ABO bidirectional mismatch: donor ABO antibodies are incompatible with recipient ABO antigens and donor ABO antigens are incompatible with recipient ABO antibodies. Rh mismatch: Rh type of the recipient is different from the Rh type of the donor. RhD-negative recipients of platelets obtained from RhD-positive donors are the only ones at risk for RhD alloimmunization.