The surface of red blood cells contains markers that the immune
system can recognize—one of these markers is the Rh factor (Rh [D] antigen). A
person whose blood contains the Rh factor is Rh-positive (D); a person whose
blood does not contain the Rh factor is Rh-negative (d).
Blood type contains information about the presence (+) or absence
(–) of the Rh factor. Blood type is indicated by a letter (A, B, or O) and a
symbol (+ or –). If a person has B negative (B–) blood, for example, that
person is Rh-negative. A person with B positive blood (B+) is
Sarah Marshall, MD - Family Medicine & William Gilbert, MD - Maternal and Fetal Medicine
PeaceHealth endeavors to provide comprehensive health care information, however some topics in this database describe services and procedures not offered by our providers or within our facilities because they do not comply with, nor are they condoned by, the ethics policies of our organization.