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Solution: Within two days of expiration, Rh-negative units were transfused to Rh-positive patients to avert outdating.
After being out of circulation for 48 hours, unused units either had expired or went back to stock one or two days before outdating.
These are still close to outdating, but they may be used for nonsurgical transfusion orders, which are filled with the oldest units first.
This led to frequent outdating of type B and AB units.