Final answer:
Rho(D) immune globulin (Rhogam) administration is the appropriate management for an unsensitized Rh-negative mother with fetomaternal hemorrhage.
Step-by-step explanation:
Rho(D) immune globulin (Rhogam) administration is the appropriate management for an unsensitized Rh-negative mother with fetomaternal hemorrhage. Rho(D) immune globulin is administered during the 28th week of pregnancy and within 72 hours after delivery to prevent the development of Rh antibodies in the mother. It works by binding to any fetal Rh+ red blood cells that enter the mother's bloodstream, preventing the activation of her immune response.