Most blood types fall into one of four blood type groups, according to whether they contain A or B antigens. For example, people with A antigens have type A blood, while those with B antigens have ...

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 ...

Blood Assurance has declared an “emergency need for donors” as its blood supply shortage continues to worsen.