When I was filling out a volunteer application for a children's hospital and was asked my blood type, I had to think twice. Though I was pretty sure it was O-positive, I wanted to confirm, so I called ...

One of the most important characteristics of blood is its type. Knowing your blood type is essential for several healthcare situations. Knowing someone's blood type is important for blood transfusions ...

A person's blood type is determined by "the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body," according to American Red Cross.