When it comes to blood types, you may know A, AB, B, and O—but those larger groups actually contain millions of different varieties. That's because the surface of our blood cells are coated with ...

A person's blood type is determined by "the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body," according to American Red Cross.

In a new study, researchers can now demonstrate that the risk of contracting the disease is elevated if the person belongs to the blood group Rhesus D antigen or what is called Rh (D). In addition to ...

Blood transfusions in a lab. We take a look at Rh-null blood, better known as "golden blood," a rare blood type that fewer than 50 people in the world have. If your blood type is O negative, you’re ...

In the first half of the 20th century, about 10,000 American infants — and as many as 200,000 worldwide — died each year from a lethal immune reaction, called Rh disease, produced by their mother’s ...