A 35-year-old multiparous woman at 20 weeks gestation attends the routine antenatal clinic. Routine screening reveals a serum alpha-fetoprotein (AFP) level of 2.5 MoM (multiples of median) with normal human chorionic gonadotropin (hCG) and unconjugated estriol (uE3). What is the most appropriate next investigation to confirm the diagnosis?

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