Anti-D immune globulin is administered to Rh-negative women antenatally at: (A) 20weeks, (B) 24weeks, (C) 28weeks, (D) 30weeks
Answer is C. The antepaum administration of anti-D immune globulin at 28weeks to Rh-negative women decreases the incidence of third-trimester alloimmunization from 18 to 20/1000 to 2/1000 patients.Reference: Practical guide to High-risk pregnancy and delivery; Chapter 14; Rh Alloimmunization