This classification system is determined by whether (*)
When this classification is different for a fetus and its mother, HDN can occur, and must be treated with Rho(D) immune globulin. This classification system is determined by whether (*) A or B antigens are present; if both are not, the person in question is an "O." For 10 points, name this classification system that governs which donors provide fluids for transfusion.
When this classification is different for a fetus and its mother, HDN can occur, and must be treated with Rho(D) immune globulin.
{blood} type [or {blood group}; prompt on {blood}]