Blood typing is determined by the molecules on the surface of the red blood cells (RBCs). In general, we can classify someone’s blood type by the absence or presence of A or B antigens and Rh factor on the surface of blood cells. The most commonly recognized blood groups are A positive, A negative, B positive, B negative, AB positive, AB negative, O positive, and O negative.
The positive or negative sign next to the blood groups is known as the Rhesus (Rh) factor. The Rh factor is an inherited protein that can be found on the surface of the red blood cell.
- If your blood type is positive, then your blood cells have the Rh protein.
- If your blood type is negative, then your blood cells lack the Rh protein.
Although Rh positive is the most common blood type, having a Rh-negative typing does not indicate illness and usually doesn’t affect your health.