A person's blood type is determined by "the presence ... These factors help define the eight most common blood types: A positive, A negative, B positive, B negative, O positive, O negative ...

Blood type is categorized into one of these eight groups: A-positive, A-negative, B-positive, B-negative, O-positive, O-negative, AB-positive and AB-negative. But what determines blood type and ...

your body is programmed to produce A and B antigens on red blood cells. A person with type O blood doesn't produce any antigens. Blood is said to be "positive" or "negative" based on whether ...