1. ABO and D grouping of the recipient.
2. Antibody screen of the recipient, or mother in the case
of neonatal transfusion, which, in the
event of a positive screen, should be followed by antibody
identification.
3. A computer or manual comparison of current results with
any historical record. These three elements constitute a group and screen.
4. Donor red cell selection and crossmatching, which
may involve serological testing between patient serum/plasma and donor red
cells or electronic selection and issue.
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