Type O Blood

Why is Type O Blood so Important

Here's Why Blood Type Matters

Before the discovery of blood types in 1901, people were receiving blood transfusions regardless of blood type. These transfusions were the cause of many deaths due to the incompatibilities. We have come a long way since 1901. Research and understanding of blood type compatibility safeguards patients today against adverse reactions. For more information on what blood types are compatible download the blood compatibility chart here.

Type O Negative

O negative is the most common blood type used for transfusions when the blood type is unknown. This is why it is used most often in cases of trauma, emergency, surgery and any situation where blood type is unknown. O negative is the universal blood type.
O negative blood type can only receive O negative blood.
O negative donors who are CMV negative are known as Heroes for Babies at the Red Cross because it is the safest blood for transfusions for immune deficient newborns. Learn more about how you can be a Hero for a Baby.
Only 7% of the population have O negative blood. Due to the its versatility for transfusions, it is in high demand. In an emergency, it is the blood product of choice. For example, just one car accident victim can require up to 100 units of O neg. Meeting the demand for O negative blood is always a priority for the Red Cross.
O negative is the first blood supply to run out during a shortage due to its universality.

Type O Positive

38% of the population have O positive blood making it the most common blood type.
Even though the red blood cells are not universally compatible, they are compatible to any red blood cells that are positive. Due to this compatibility it is in high demand as well.
Those with O positive blood can only receive transfusions from O positive or O negative blood types.

Did You Know?

About 43% of Americans are type O.

Heart disease is lower with type O.

Type O can donate red blood cells.

Why Donations Are So Important

Latest studies have shown that someone in the US needs a blood transfusion every 2 seconds each day in the United States. The average person can only donate 1 pint of whole blood in a single donation and the shelf life is 42 days, which is why the need to keep replenishing the supply to meet demand is great. Only 38% of the population in the United State are eligible to donate blood, but only 3% donate.

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O Blood Type