Transfusion
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The 30-minute rule, whereby intact red blood cell (RBC) products may be returned to stock if returned to 4 degrees C storage within 30 minutes of issue, was established many years ago. It was based on observations that the core temperature of units of whole blood removed from storage temperatures of 1 to 6 degrees C, and left at room temperature, would reach 10 degrees C at between 45 minutes and 1 hour. ⋯ In view of our results, and the range of RBC products now available, it may be timely for blood services to review and reduce the 30-minute rule.