How common is O negative blood worldwide?

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Detailed Solution

O negative (O-) blood is relatively rare, though its prevalence varies significantly across different populations. On average, only about 7% of the world's population has O negative blood.

Despite its rarity, O- blood is in extremely high demand because it is the "universal red cell donor" type, meaning O- red blood cells can be transfused to patients of any blood type in an emergency.

Prevalence by population is a key factor:

Caucasian populations: O negative is most common in people of Caucasian descent, where it can be found in up to 15% of the population in some countries.
African-American populations: The prevalence is lower, typically around 4-5%.
Hispanic-American populations: Prevalence is also around 4-5%.
Asian populations: O negative is extremely rare, often found in less than 1% of the population.

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