Most people are familiar with the common blood groups A, B, AB and O, along with the Rh factor that determines whether a type is positive or negative. Yet new research reveals how surprisingly complex ...

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 ...

A routine medical test turned extraordinary for a woman from the Caribbean when doctors found something completely new in her blood. Nearly 15 years ago, while preparing for surgery in Paris, doctors ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Scientists have discovered the rarest blood type on Earth, belonging to just one woman. Talk about a lonely hearts club. An ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

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.

WICHITA, Kan. (KWCH) - A Wichita man has devoted more than three decades of his life to donating blood, all because he’s got a rare blood type. Brett Hart has been rolling up his sleeve for around 35 ...

Your blood type isn’t just relevant when you need a transfusion. It fundamentally influences which diseases you’re most susceptible to throughout your life. Scientists have discovered that the ...