O-positive and O-negative blood supplies are critically low across Oklahoma. Here’s why hospitals rely on type O donors and how you can help. O-positive and O-negative blood supplies are critically ...

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 ...

You are probably aware of the two main blood group systems: the AB system and the rhesus system. Under the AB system, there are four main blood types A, B, AB and O. And each of these four types can ...

Your blood type might seem like a minor detail in your medical history, but it carries significant implications for your health and medical care. From emergency transfusions to pregnancy planning, ...

O-negative “universal donor” blood is in chronically short supply in the U.S., raising concerns for emergency care and patient safety. Because anesthesiologists administer up to 60% of blood ...