what type of blood is rh positive
What the Test Does. The Rh factor is a type of protein that's usually on blood cells. When you have this protein, you are considered Rh positive. About 85% of people are Rh-positive.The rest are Rh-negative -- they don't have the protein. Normally, being Rh-negative has no risks.hat the Test Does. The Rh factor is a type of protein that's usually on blood cells. When you have this protein, you are considered Rh positive. About 85% of people are Rh-positive.