Human blood already comes in a bewildering variety of types, but researchers have now identified a new one so rare that only ...

Knowing your blood type is critical during emergency health situations. Knowing your blood type is crucial medical information, but unless you've given blood before you might not be sure what yours is ...

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 ...

Research suggests a surprising link between blood type and stroke risk, with people carrying one specific group A blood type ...

T cells, also known as lymphocytes, are a type of white blood cell that play an important role in the body's immune response.

Red blood cells transport oxygen throughout your body, including to vital organs and tissues. They also help your body get rid of carbon dioxide. Too little or too many red blood cells may be ...

A therapy that would once have been considered a feat of science fiction has reversed aggressive and incurable blood cancers ...

Measuring the lymphocytes—white blood cells that fight infection—in a patient's blood can be used to predict outcomes in ...

Researchers at the University of Arizona say a previously unknown population of circulating immune cells play a critical role ...

Tens of thousands of people have already volunteered to donate blood. But donations will also be needed in the coming weeks.