A blood type is classified by the presence or absence of antibodies and certain antigens on the surface of the red blood cells (RBCs). There are four distinct blood types; A, B, AB and O. Transfusion ...

Red blood cells are complex — there's much more to blood types than A, B and O. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Many people know ...

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 ...

This article was reviewed by Darragh O’Carroll, MD. Have you ever wondered if your blood type could influence the foods you should eat? That’s the idea behind the blood type diet, a nutrition theory ...