A third of Americans don’t know their blood type. Are you one of them? Well, you don’t have to be anymore, and since you get an easily get an accurate blood type test kit for home use you don’t even have to go into the doctor’s office or clinic anymore (although we recommend you still do to confirm results). Some experts believe that 1/3 number is even higher. Donald Karcher, the president-elect of the College of American Pathologists, believes it’s “probably more than half” of the population, with many not believing it is important.