Accuracy Of Fetal Ultrasound Dating

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Ultrasound Accuracy for Predicting Due Dates
Methods for Estimating the Due Date | ACOG
Accuracy of ultrasound dating formulae in the late second . . .
Accuracy of sonographic fetal gender determination . . .
When LMP and Ultrasound Dates Don't Match: When to Redate . . .
Accuracy of ultrasound to determine date of conception
How Accurate Are Ultrasounds? Experts Weigh In
Determination of gestational age by ultrasound
Ultrasound dating at 12-14 or 15-20 weeks of gestation? A . . .
Ultrasound Accuracy for Pregnancy Issues
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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 .
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 .
Pregnancy dating by ultrasound in the late second trimester is sufficiently accurate for routine clinical use . Formulae based on femur length appear to be at least as accurate as head measurements .
Fetal gender was predicted using the sagittal plane only in the first trimester and either the sagittal or transverse plane in later trimesters . Phenotypic gender confirmation was obtained from hospital records or direct telephone contact with women postnatally . Results: Results confirmed 100% accuracy in predictions made after 14 weeks gestation . The overall success rate in the first trimester group (11-14 weeks) was 75% .
First trimester ultrasound is the most accurate time frame for pregnancy dating and can increase the accuracy of the EDD even if LMP is known; 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
According to this period date, the most likely date of conception would be around 14 days after the period, that is around the 19th of February . Ultrasound has intrinsic error of upto maximum 5 - 7 days, so the probable dates of sex would have been a week before or after the 19th of February, but in NO WAY as early as January 18th .
In terms of dating , the ultrasound's accuracy depends on the trimester, explains Kara Manglani, CNM, a nurse-midwife practicing in New York City and blogging at The Fertile Times . She tells Romper . . .
Potential harms include the possible reassignment of dates when significant fetal pathology (such as fetal growth restriction or macrosomia) result in a discrepancy between ultrasound biometric and clinical gestational age . Such reassignment may lead to the omission of appropriate-or the performance of inappropriate- fetal interventions .
Ultrasound dating in the second trimester is more accurate than the last menstrual period (LMP) for predicting delivery date 4-7 . Many commonly used mathematical models using measurements of the fetal biparietal diameter (BPD) and the fetal femur length (FL) were designed to calculate gestational age from 14 gestational weeks 8 , 9 .
Detecting the Fetal Heartbeat . Ultrasounds can detect a fetal heartbeat in pregnancies beyond 7 to 8 weeks . But during the early weeks of pregnancy, it can be difficult to distinguish an earlier-than-estimated pregnancy from a missed miscarriage . For that reason, it usually takes two ultrasounds conducted several days apart to confirm or rule out a miscarriage at this stage .
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Accuracy Of Fetal Ultrasound Dating