What characteristic defines Rh+ blood?

Rh+ blood is defined by the presence of the Rh antigen, specifically the D antigen, on the surface of red blood cells. This antigen is a key factor in determining an individual’s Rh status. The presence of the Rh antigen indicates that the person has a positive Rh factor, which can be significant in blood transfusions, pregnancy, and organ transplants.

When Rh+ blood is identified, it signifies that the immune system of that individual will not mount an immune response against blood that contains this antigen. In contrast, individuals with Rh- blood lack this antigen and may produce antibodies against it if exposed to Rh+ blood.

Understanding the distinction between Rh+ and Rh- blood types is essential in clinical settings. For instance, if an Rh- individual receives Rh+ blood, they may develop an immune reaction that can lead to serious complications. Therefore, recognizing the presence of the Rh antigen is critical for safe blood transfusions and managing potential Rh incompatibilities.