Curious if anyone has ever heard of retaining the open segment (in a capped tube) post crossmatch. The justification given is to ensure the segment used for crossmatch is the segment used in workup, should a transfusion reaction be suspected. I have only ever pulled an unopened segment (either upon receipt of unit or prior to issue depending on the facility) but never heard of this other option. Please help me! If this in an antiquated process, please explain the origin or if it is of value, help me with some references. Look forward to the dialogue.