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Is an ultrasound dating scan needed before screening?

April 26, 2017dating needed scan screening Ultrasound

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Is an ultrasound dating scan needed before screening?

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A We can use the last menstrual period (LMP) date to estimate gestation and calculate MoMs. Gestational errors will distort the marker profile, so if there is doubt about the LMP a scan is preferred. CF screening is not gestation dependent.