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Ultrasound dating third trimester

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Added: 20.03.2021
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Redating a pregnancy may occur when there is a discrepancy between the estimated due date EDD calculated by the last menstrual period LMP and that by ultrasound. Care should be taken when redating a pregnancy, especially in the third trimester, as there may be other reasons for a fetus to be small for gestational age e. According to the ACOG redating is more reliable using the earliest available and reliable ultrasound examination surrogates. For instance, CRL in the first trimester would be more accurate than a debatable uncertain LMP or 2nd-trimester biometrics. The estimated timelines listed below mandates the redating of pregnancy when these differences happen on obstetric US exams.
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How Many Ultrasounds Do You Need During Pregnancy?

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When LMP and Ultrasound Dates Don't Match: When to Redate? - The ObG Project

The second trimester scan is a routine ultrasound examination in many countries that is primarily used to assess fetal anatomy and detect the presence of any fetal anomalies. Alternate names for the study include second trimester anatomy scan, fetal anomaly scan or TIFFA targeted imaging for fetal anomalies. The following structures should be visualized at a routine second trimester morphology ultrasound. Second trimester ultrasound. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Updating… Please wait.
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Ultrasound Accuracy for Predicting Due Dates

It is now considered by many to be the most valuable diagnostic tool in the field. Ultrasound was first used clinically in pregnancy in the early s to measure the biparietal diameter BPD —the distance between spikes on an oscilloscope screen. Since then, the technology has progressed to the point that even relatively inexpensive ultrasound machines yield detailed real-time images of the fetus. This chapter addresses general aspects of ultrasound in pregnancy as well as the use of ultrasound to diagnose birth defects.
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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. To determine which ultrasound biometric parameters are superior when gestational age is uncertain. To determine whether ultrasound gestational age assessment is cost effective.
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