According to Stanford Blood Centre, there are a total of 8 types of blood groups, which are categorised based on the presence ...

I f you can't quite remember what your blood type is -- don't worry. That just means you're among the 33% of Americans who ...

O negative is a rare blood type that can be given to anyone. It is called the “universal donor” and is very useful in ...

It's a bit simplistic, but you can think of the Rh factor as a protein that is either present (positive) or absent (negative) on red blood cells. Exact percentages vary with race, but most people ...