Scientists are working to grow the rarest blood type in the world in a lab, an effort that could have huge ramifications for medicine. The blood type in question, Rh null, is found in just 50 people ...

“I’m going to keep doing it until they tell me to stop,” said Nigel Vaughan, who has donated his blood nearly 250 times ...

There’s more history in your blood types than you think, and it didn’t begin with humans. Here’s what we know about them, ...

Your blood type is more than just a label on your medical chart—it can affect your health, disease risk, and even emergency ...

In a routine blood test that turned extraordinary, French scientists have identified the world’s newest and rarest blood group. The sole known carrier is a woman from Guadeloupe whose blood is so ...

Orlando, Fla. -- An international search is on to find some of the rarest blood in the world to help save the life of a 2-year-old South Florida girl. Zainab has neuroblastoma, an aggressive form of ...

An investigation into why blood doesn't always behave as doctors expect has revealed a super-rare mutation in an extremely uncommon variation of blood. Testing more than 544,000 blood samples in a ...

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.

Most people don’t spare a thought for their blood type unless they’re in need of a transfusion — but could yours hold secrets to your health? There are four main blood types: A, B, AB and O.

Add Yahoo as a preferred source to see more of our stories on Google. Nigel Vaughan discovered he had a rare blood type during a murder investigation when he was 16 in the 1970s While he wasn’t ...