Fetal Ultrasound Dating Accuracy

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Ultrasound Accuracy for Predicting Due Dates
Methods for Estimating the Due Date | ACOG
Accuracy of sonographic fetal gender determination . . .
Ultrasound in obstetric decision making . How accurate are . . .
When LMP and Ultrasound Dates Don't Match: When to Redate . . .
Accuracy of ultrasound to determine date of conception
Ultrasound Accuracy for Pregnancy Issues
Determination of gestational age by ultrasound
Ultrasound Accuracy for Pregnancy - Conquest Imaging
Pregnancy dating by fetal crown-rump length: a systematic . . .
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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 .
Introduction . It is nearly 40 years since ultrasound was first used to evaluate the obstetric patient, 1 today ultrasound scanning is firmly entrenched in antenatal care . The value of ultrasound screening in detecting and monitoring fetal malformation, placental position and multiple pregnancies is undeniable 2 .Initially fetal gender assignment by ultrasound was indicated in fetuses at risk . . .
The last ultrasound scans underestimated gestational age by a median of 8 days, and by 2 weeks or more in 20 of the 69 cases, as opposed to best dating criteria . Ultrasonic fetal weight estimation was more accurate, but erred by more than 20% in 10% of cases .
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 .
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 .
Objective: To assist clinicians in assigning gestational age based on ultrasound biometry . Outcomes: To determine whether ultrasound dating provides more accurate gestational age assessment than menstrual dating with or without the use of ultrasound . To provide maternity health care providers and researchers with evidence-based guidelines for the assignment of gestational age .
In detecting a fetal heartbeat, an ultrasound should be 100 percent accurate . If there is one, the ultrasound will detect it with ease . The heartbeat is viewable during the gestational period beyond seven to eight weeks .
Fetal crown-rump length (CRL) measurement by ultrasound in the first trimester is the standard method for pregnancy dating ; however, a multitude of CRL equations to estimate gestational age (GA) are reported in the literature . Objective .
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Fetal Ultrasound Dating Accuracy

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