What does Rh blood type positive mean?

RH blood group positive refers to an individual being classified as positive within the RH blood group system. In the RH blood group system, whether red blood cells carry the D antigen is the key factor in determining if the blood type is positive or negative. Specifically: 1. **Presence of the D antigen**: RH blood group positivity means that the individual's red blood cells carry the D antigen. The D antigen is the strongest antigen in the RH blood group system, so it is commonly used in clinical practice as the standard for determining RH blood type. 2. **Prevalence**: In China, RH blood group positive is a very common blood type, with approximately 99% of the population belonging to this category. In contrast, RH negative blood is relatively rare, occurring in only about 1% of people, and is therefore also known as "Panda blood." 3. **Blood transfusion considerations**: During blood transfusion, RH positive and RH negative individuals cannot cross-transfuse, because the agglutinogens present in RH positive blood may stimulate RH negative recipients to produce RH antibodies, potentially leading to hemolytic transfusion reactions.