There are different blood types: A, B, AB, and O, with each also being Rh-positive or Rh-negative. Knowing your blood type is important for safe blood transfusions and organ transplants. Type ...

Many people don't know what their blood type is. It's either type A, type B, a combination called type AB or type O. But what makes those types different is a microscopic bit of protein on the surface ...

Close up photo of female scientist holding a laboratory pipette and a blood sample tube for covid-19 in laboratory. She is wearing a protective suit, laboratory glasses, surgical mask and surgical ...

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 ...

Dear Dr. Roach: I’m an 84-year-old Caucasian man in good health. In college, I donated blood and was told I was Type O-negative. Later in life, I donated many pints to the Red Cross. About 45 years ...