More than 100 years ago, Dr. Karl Landsteiner discovered that not all red blood cells are alike. He found that, when different people's blood was mixed, it would often clump up and curdle, destroying ...

When modern humans journeyed out of Africa, a rapid evolution in their red blood cells may have helped them survive — but it may have also led to the eventual disappearance of Neanderthals, a new ...

A new study reveals an especially rare blood type that was not known until today – and only three people in the world have it. The discovery, which was made almost by accident, took place as part of a ...

The ABO-Rh system of blood group typing is an immensely successful method that helps medical professionals safely perform blood transfusions throughout the world. Scientists from the French Blood ...

Talk about a lonely hearts club. An unidentified woman from Guadeloupe has the rarest blood type on Earth, to the extent that she’s only compatible with herself. The 68-year-old is thus far the only ...

The blood type is more than just a letter and a plus or minus sign; it can be an indicator of certain health risks. Blood types are determined by the presence or absence of certain antigens on the ...

Medical emergencies strike without warning. Whether it’s a car accident, severe allergic reaction, or unexpected surgery, having family and friends who know your blood type can significantly impact ...

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.