Most people know their blood type—A, B, AB or O—along with whether they are Rh-positive or negative. But these familiar categories (those letters plus "positive" or "negative") represent just two of ...

As blood banks across the U.S. report dangerously low supplies of O-negative blood (red blood cells), anesthesiologists are calling for increased donation and changes in how hospitals use this ...

As blood banks across the U.S. report dangerously low supplies of O-negative blood (red blood cells) - commonly called the "universal donor" - anesthesiologists are calling for increased donation and ...

NHS Blood and Transplant (NHSBT) has issued an urgent call for more blood donors “to stabilise the nation's blood supply,” warning that stocks of O-negative red cells are nearing red-alert status.

In 2011, a woman from the French overseas region of Guadeloupe underwent routine tests before a surgery. Strikingly, doctors could not identify her blood group, which was so unique that they did not ...