What are Blood Types?

If you’ve ever donated blood or had a blood test, you probably know your blood type. Have you ever wondered exactly what are the blood types? Blood is divided into 4 basic groups, depending on the presence or absence of different proteins — so you may be Type A, Type B, Type AB or Type O. In addition, each of the groups has a positive or negative part, depending on the presence of Rh factor. This gives you types like A+, A-, B+, B- and so on. You can find more information here: