This document discusses Rh isoimmune disease, which occurs when a pregnant woman has Rh-negative blood and her baby has Rh-positive blood. It begins by explaining the differences between isoimmune and autoimmune diseases. It then covers blood group systems like ABO and Rh, how they are inherited, and the importance of compatibility for transfusions. The majority of the document focuses on Rh incompatibility during pregnancy, how it can harm the fetus, diagnosis, and treatments like intrauterine transfusions, early delivery, and phototherapy or exchange transfusions for the newborn. It emphasizes the need for Rh-negative mothers to receive Rh immunoglobulin injections during and after pregnancy to prevent sensitization.