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1043 Medicine

A 32-year-old woman is confirmed as being 6 weeks pregnant. She feels well, and has no past medical history. This is her second pregnancy; the first pregnancy was uncomplicated and she delivered at term, but the baby was anemic due to beta-thalassemia. She is now worried that the current pregnancy may also be affected. Which of the following methods is most likely to establish an accurate prenatal diagnosis?

Afetal ultrasound at 12 weeks
Bcord blood electrophoresis
Cchorionic villus sampling
Dbuccal mucosal cytology of both parents
Medicine
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