Medically reviewed by Amelia MacIntyre, DO One of the most important characteristics of blood is its type. Knowing your blood ...

The four major blood groups are based on whether or not you have two specific antigens — A and B. Doctors call this the ABO Blood Group System. The third kind of antigen is called the Rh factor.

Most blood types fall into one of four blood type groups, according to whether they contain A or B antigens. For example, people with A antigens have type A blood, while those with B antigens have ...

T cells, move over. B cells are now reported, in a recent paper in Nature, to have their own immunological synapses with APCs. Only this time the antigen is whole and B cells don't keep it to ...

Your blood type may be the secret to understanding how healthy your heart is.

If you have type AB blood, for example, your body is programmed to produce A and B antigens on red blood cells. A person with type O blood doesn't produce any antigens. Blood is said to be ...

Assays for hepatitis B surface antigen (HBsAg) are the most frequently used tests to detect HBV infection. Vaccination for HBV can produce transiently detectable levels of HBsAg in patients.