The need for—and dearth of—one precious commodity.
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Seconds that pass until another American needs a transfusion
Number of American lives saved each year by transfusions
Gallons of blood an American could donate if she began giving at age 17 and gave every 56 days until reaching age 76
Estimated annual percentage of eligible Americans who donate
Number of Americans who donated in the days following the September 11 attacks
Number of units of blood components transfused in 2001 (a single donation can be divided into plasma, platelets and red blood cells)
Times as likely heart patients are to die after a transfusion to treat blood loss or anemia as heart patients who do not receive a transfusion, possibly because of such problems as artery disease aggravated by the transfusion.