Hospitals rely on donated blood for a range of treatments, and the pandemic has seriously threatened that supply. Here's what you need to know about the science behind blood donation — and why it's critically needed.
In the U.S., about 38 percent of people have O+ blood, and one in three has A+ blood. The remaining blood types, A-, B+, B-, AB+, AB-, and O-, are less common and frequency ranges from 9 percent for B+ to 1 percent for AB-, according to the American Red Cross., for example, occurs in one out of every six million people, which makes blood transfusion more difficult for those individuals.
Problematically, only 7 percent of the population has O- blood, and high demand means it is the first to run out during a shortage. “O- is reserved for emergencies, particularly for women of child bearing potential,” Lasky says. “It has implications for women who create antibodies in future pregnancies.” Medical care providers also rely on O+ because it can be received by any other positive blood type, and most people have a positive blood type.
Either way, both the American Red Cross and America’s Blood Centers say the shortage means that all blood components and types are in short supply. “We really need blood across the board,” Lasky says.
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