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15-Nov-2019 03:52

Mean sac diameter measurements are not recommended for estimating the due date.

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Ultrasound dating in the second trimester typically is based on regression formulas that incorporate variables such as; Gestational age assessment by ultrasonography in the first part of the second trimester (between 14 0/7 weeks and 21 6/7 weeks of gestation, inclusive) is based on a composite of fetal biometric measurements and has an accuracy of ± 7–10 days.Using a single ultrasound examination in the second trimester to assist in determination of gestational age enables simultaneous fetal anatomic evaluation.