Many countries lack blood donors. The quest to create an artificial, lab-made blood type that could make up for supply shortages is extremely difficult. But there are some technologies that offer hope ...

Bacterial enzymes may help increase the supply of universal blood. There is an outsize demand for type O blood, specifically because it includes red blood cells that can be transfused into anyone ...

Scientists have transfused lab-made red blood cells into a human volunteer in a world-first trial that experts say has major potential for people with hard-to-match blood types or conditions such as ...

Until the 1940s, blood transfusions often went wrong because some of the main blood-group systems, such as the Rhesus factor, had yet to be discovered. This hit or miss approach to matching donors ...