The second most common blood type is A positive which occurs in "33% of Caucasian, 24% of African American, 27% of Asian and 29% of Latino American" populations," says the Red Cross.

Type O negative blood is often reached for in emergencies when there isn’t time to match a patient’s blood type. Type O positive is the most common blood type, so it’s important to keep type ...

People with that blood type are urged to donate ASAP. Type O-Negative can be given to people with any blood type in emergencies, while Type O-positive is the most common blood type in South Texas.