Scientists from the French Blood Establishment (EFS) has successfully identified the ultra-rare 48 th blood type group, known as “Gwada negative,” which came from a blood sample originally drawn some ...

Less common types include the weak D type 4.2, though it is more prevalent among people of African descent. 6 An exhaustive list of weak D types that should be treated as Rh negative is maintained by ...

Type O: The most common blood type, with about 45% of the population having it; O-negative, the universal donor blood type, is present in only 7% of people in the U.S., while the other 38% have O ...

Many studies show no clear evidence that people with Rh-negative blood are at increased risk for chronic medical issues. AB negative is the rarest blood type to have, but that’s not a bad thing.

Learn who can donate blood to you and who you can donate to, plus the importance of blood types, Rh factors, and why O-negative is a universal donor.