A 32-year-old Rh-negative woman, G2P1, presents at 28 weeks of gestation with a positive indirect Coombs test (ICT) and antibody titre of 1:32 against anti-D. She has a history of transfusion with Rh-positive blood 5 years ago. Ultrasound shows no signs of fetal hydrops. What is the most appropriate next step in management?

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