Dating Gestational Age Ultrasound

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Determination of gestational age by ultrasound
Methods for Estimating the Due Date | ACOG
Ultrasound dating at 12-14 or 15-20 weeks of gestation? A . . .
Due Date from Utrasound Reportcalculator
PDF Ultrasound Dating Criteria
When LMP and Ultrasound Dates Don't Match: When to Redate . . .
PDF Ultrasound: Dating Criteria and Worksheet Dating Criteria
Ultrasound Accuracy for Predicting Due Dates
Gestational age | Radiology Reference Article . . .
Assessment of Gestational Age by Ultrasound | GLOWM
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When performed with quality and precision, ultrasound alone is more accurate than a "certain" menstrual date for determining gestational age in the first and second trimesters (≤ 23 weeks) in spontaneous conceptions, and it is the best method for estimating the delivery date .
If dating by ultrasonography performed between 14 0/7 weeks and 15 6/7 weeks of gestation (inclusive) varies from LMP dating by more than 7 days, or if ultrasonography dating between 16 0/7 weeks and 21 6/7 weeks of gestation varies by more than 10 days, the EDD should be changed to correspond with the ultrasonography dating Table 1 .Between 22 0/7 weeks and 27 6/7 weeks of gestation, ultrasonography dating has an accuracy of ± 10-14 days 19 .
Gestational age in the IVF population was also estimated using seven ultrasound dating formulae based on BPD measurements and three formulae based on BPD and FL measurements (Table 1) . For clinical management gestational age was estimated using the BPD formula of Persson and Weldner at the 12-14-week scan and the BPD/FL formula of Persson and . . .
Enter the Calculated Gestational Age on the Date Ultrasound was Performed weeks days
with LMP dating , gestational age should not be adjusted based on a second-trimester ultrasound examination . For anatomic detail we suggest an US from 20-22 wks, rather than at 18 wks .
Consider a pregnancy without a dating ultrasound prior to 22 0/7 weeks 'suboptimally dated' (refer to Related ObG Topics below) Mean sac diameter is not recommended for dating ; In the setting of assisted reproductive technology (ART), the ART derived gestational age should be used for EDD using the age of the embryo and the transfer date
with LMP dating , gestational age should not be adjusted based on a second-trimester ultrasound examination . For anatomic detail we suggest an US from 20-22 wks, rather than at 18 wks .
As pregnancy progresses, the accuracy of an ultrasound for predicting due dates decreases . Between 18 and 28 weeks of gestation, the margin of error increases to plus or minus two weeks . After 28 weeks, the ultrasound may be off by three weeks or more in predicting a due date .
Mean sac diameter (MSD) before a fetal pole is identified and biparietal diameter (BPD) after 11 weeks can also be used to support the calculation of the gestational age . The estimated date of delivery (EDD) should be calculated by last menstrual period (LMP) unless 1: unknown LMP; GA by CRL is <10 weeks and differs from GA by LMP by >5 days
Gestational age can be more accurately predicted by obtaining paired BPD measurements (the first from 20 to 26 weeks' gestation and the second from 31 to 33 weeks' gestation) and assigning gestational age by a method developed by Sabbagha and co-workers 79 known as growth-adjusted sonographic age (GASA) .
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Dating Gestational Age Ultrasound

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