Each year, nearly five million Americans need a life saving blood transfusion, and 38,000 units of blood are needed every day in this country. Not surprisingly, most Americans know little and think less about donating blood; almost 20 percent of non-donors cite “never thought about it” as the main reason for not giving.
Few people realize that blood has a shelf life of only 42 days, or that U.S. adults are allowed to give blood every two months (or 56 days). About 60 percent of the U.S. population is eligible to donate blood, but only 5 percent do. More information about blood donation is available here.