I received this card during my first pregnancy and I’ve kept it handy ever since, just in case. I share it with new doctors so that they will have the information.
“Different ethnic and racial groups also have different frequency of the main blood types in their populations. For example, approximately 45 percent of Caucasians are Type O, but 51 percent of African Americans and 57 percent of Hispanics are Type O. Type O is routinely in short supply and in high demand by hospitals – both because it is the most common blood type and because Type O-negative blood, in particular, is the universal type needed for emergency transfusions. Minority and diverse populations, therefore, play a critical role in meeting the constant need for blood.” Red Cross Blood Type Charts and information
My husband also has O+ and I would suppose all of our children also have O+ and that our parents did also. A very popular blood type, although not quite as useful as O-.