Medically reviewed by Amelia MacIntyre, DO There are different blood types: A, B, AB, and O, with each also being Rh-positive or Rh-negative.Knowing your blood type is important for safe blood ...

Which blood type test kit is best? There are a number of reasons why you might want to know what your blood type is. Some top reasons for this include matching with blood donors and discovering ...

When you're a mom-to-be, one of the prenatal tests you may get is an antibody test or antibody screening. It looks for certain antibodies, special proteins made by your immune system, in your blood.

The Rh factor is a type of protein that's usually found on red blood cells. When you have this protein, you’re considered Rh positive. About 85% of people are Rh-positive. The rest are Rh-negative.