What is a common reason for crossmatch incompatibility when all screening cells react strongly and all donor units are incompatible, and what is the recommended course of action?

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The main idea is that a universal incompatibility in crossmatching most often points to a pre-analytical mix-up, not a patient antibody. If the wrong patient specimen or mislabeled unit/tatient information is being used, the test ends up comparing the donor cells to the wrong plasma, producing incompatibility with all donor units and a positive screen across all screening cells. That’s why the recommended action is to re-check the paperwork and verify patient identity and specimen/unit labeling, then obtain a correctly labeled specimen and repeat the crossmatch. If the labeling and IDs are corrected and the crossmatch still shows incompatibility, investigate a true antibody scenario.