| The transfusion facility chose to crossmatch and transfuse type O red cells. |
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| The patient was transfused following a biologic crossmatch in an attempt to maintain hemoglobin and hematocrit levels. |
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| This crossmatch was compatible and the unit was allocated for possible exchange transfusion for the twins. |
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| Some patients, however, develop a positive crossmatch to donor lymphocytes and cannot receive a graft from that donor. |
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| Since the crossmatch uses the patient's serum, which may lack potency, donors who are weakly positive for the antigen may be mistakenly called compatible. |
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| Blood type and screen or crossmatch may be ordered by the surgeon. |
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| A positive crossmatch usually contraindicates the donor recipient transplant under consideration. |
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| As a final precaution before grafting, a direct crossmatch is performed between the recipient's serum and donor lymphocytes. |
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| If there is no antibody present, an immediate spin crossmatch or computer assisted crossmatch is performed where the recipient serum and donor rbc are incubated. |
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