There are 4 blood forms: A, B, AB, or O. Also, blood is possibly Rh-positive or Rh-adverse. So When you've got type A blood, It truly is both A good or perhaps a unfavorable. Which kind you're is important if you want a blood transfusion. And also your Rh https://www.youtube.com/watch?v=buIHtQY7fCU