Clinical Pathology: Transfusion Medicine

• The ABO group of all red blood cell (RBC) units and the Rh-type of RBC units labeled as Rh-negative must be confirmed using a serologic test by the transfusing facility. The purpose of these measures is to prevent the transfusion of mislabeled, ABO- and Rh-incompatible RBCs.

• Confirmatory testing is performed on a sample from an attached segment. The unit itself is not entered.

• Confirmatory testing for weak D is not required.

• Discrepancies must be resolved before the unit can be issued.

• The facility that collected blood with discrepant results should be notified.

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