CAMLPR Transfusion Practice Test

The main idea is how red cell surface carbohydrates change as we mature. In fetal and neonatal life, the i antigen is the dominant form on red cells. As erythrocytes mature, the i antigen decreases and the I antigen becomes the prevalent surface structure. This shift stems from changes in glycosylation patterns driven by different glycosyltransferase activities, leading to the well-developed I antigen in adulthood. The P1 and Le antigens are governed by separate genetic factors and aren’t tied to this developmental switch, with Le expression influenced by secretor status and P1 varying independently.