<prompt> Rh isoimmunisation in which trimester10-12 weeks30-32 weeks36 weeksImmediately after delivery  <response>: B 30-32 weeks Because of its short half-life, Rh IgG routinely is administered once at 28-32 weeks gestation and again within 72 hours after birth to all Rh-negative pregnant females as a part of routine prenatal care. 