The limited storage time means that it is difficult to have a stockpile of blood to prepare for a disaster . The subject was discussed at length after the September 11 attacks in the United States , and the consensus was that collecting during a disaster was impractical and that efforts should be focused on maintaining an adequate supply at all times . Blood centers in the U.S. often have difficulty maintaining even a three-day supply for routine transfusion demands
September 11 attacks
September 11 attacks
Blood donation