Final answer:
The statement that an RDH can work in schools is true. The D antigen is part of the Rh not ABO blood group system, making the statement false. Hemolytic disease of the newborn is more likely in a second pregnancy due to potential antibody formation following a first pregnancy with Rh incompatibility.
Step-by-step explanation:
To address the question regarding whether an RDH can work in schools, the statement is True. A Registered Dental Hygienist (RDH) can indeed work in school settings, often providing dental education, screenings, and preventive services to students.
The D antigen is not part of the ABO blood group system; rather, it is a part of the Rh blood group system. Therefore, the statement is False. In the context of blood donation, the compatibility of the Rh factor (positive or negative) is critical in addition to the ABO blood type.
Hemolytic disease of the newborn may be more likely to occur in a second pregnancy because if an Rh-negative mother has developed antibodies due to exposure to Rh-positive fetal blood in her first pregnancy, her immune system may attack the Rh-positive blood of a subsequent fetus, causing the disease.