These are the results of the crossmatch performed in the transfusion service laboratory while the patient was receiving two units of O Rh-negative RBCs.
| Cells | Gel IAT* |
| Donor 1** | 2+ |
| Donor 2** | 2+ |
| Donor 3 | 3+ |
| Donor 4 | 3+ |
| Donor 5 | 2+ |
| Donor 6 | 3+ |
*IAT = indirect antiglobulin test
**O Rh-negative RBC (Donors 3–6 are O Rh-positive)
