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How accurate is early ultrasound in determining the expected delivery date?

April 26, 2017accurate DELIVERY determining early Ultrasound

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How accurate is early ultrasound in determining the expected delivery date?

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We use the ultrasound expected delivery date when there is more than five days’ difference between this and the one based on the date of the last menstrual period. When an ultrasound is done during the second trimester (at 20 weeks), the two dates must differ by more than 10 days for the ultrasound date to be used.