Obstetric Ultrasound Dating Accuracy

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Methods for Estimating the Due Date | ACOG
Ultrasound in obstetric decision making . How accurate are . . .
When LMP and Ultrasound Dates Don't Match: When to Redate . . .
Accuracy of sonographic fetal gender determination . . .
Accuracy of sonographic fetal gender determination . . .
Literature Review on Obstetric Ultrasound Diagnostic Accuracy
Ultrasound Accuracy for Predicting Due Dates
Determination of gestational age by ultrasound
Obstetric Ultrasound Examination (Position Paper)
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Appropriately performed obstetric ultrasonography has been shown to accurately determine fetal gestational age 1 . A consistent and exacting approach to accurate dating is also a research and public health imperative because of the influence of dating on investigational protocols and vital statistics .
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)
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% . When excluding those scans where a prediction could not be made, success rates increased to 91% .
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 of . . .
The importance of achieving accurate foetal measurements in obstetric ultrasound is widely understood to allow high quality assessment of foetal growth and development . Ultrasound has been widely accepted as the routine method of diagnosis in the obstetric field for foetal abnormalities due to its accessibility and efficiency in diagnosis .
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 .
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 .
These advanced skills include clinical assessment of gestational age; ascertainment of accurate dating with ultrasound , if indicated; and ultrasound -guided amniocentesis during the second . . .
Overall, the accuracy of sonographic dating in the first trimester is +/-5 days (95% confidence range) . Cardiac activity should be present in an embryo with a CRL ≥7 mm 3 . If it not detected at this size on transvaginal scanning performed by an experienced operator, it is an indicator of failed early pregnancy (missed miscarriage) .
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Obstetric Ultrasound Dating Accuracy

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