A 32-year-old multiparous woman (G3P2) with Rh-negative blood group is at 28 weeks of gestation. Routine antenatal screening shows an indirect Coombs test (ICT) titre of 1:64 with anti-D antibodies. Ultrasound reveals mild fetal ascites and hepatomegaly. Amniocentesis is performed and ΔOD450 is plotted in zone 2 of the Liley chart. What is the most appropriate next step in management?

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