Do you know your blood type? Scientists say everyone should in case of a life-threatening event that results in a need for a blood transfusion. But now, they've discovered a new group of blood types ...

Blood types are a classification of blood based on the antigens present in red blood cells. In the United States, O-positive is the most common blood type, and AB-negative is the rarest. A blood ...

Here’s what you’ll learn when you read this story: There are rare blood types beyond the eight most common ones, and researchers have discovered one more that brings the total count to 49. Blood type ...

Blood transfusions save lives. In the US alone, people receive around 10 million units each year. But blood banks are always short in supply—especially when it comes to the “universal donor” type O.

Knowing your blood type is critical during emergency health situations. Knowing your blood type is crucial medical information, but unless you've given blood before you might not be sure what yours is ...

A hypersensitivity reaction happens when the immune system mistakenly identifies harmless substances as harmful. There are several types of hypersensitivity reactions, depending on the class of ...