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Accurate determination of gestational age can positively affect pregnancy outcomes. Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination.
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This document reflects emerging clinical and scientific advances as of the date issued and is subject to change. First- and second-trimester ultrasound assessment of gestational age. For the purposes of research and surveillance, the best obstetric estimate, rather than estimates based on the last menstrual period alone, should be used as the measure for gestational age.
Last menstrual period versus ultrasound for pregnancy dating. Computer assisted analysis of fetal age in the third trimester using multiple fetal growth parameters.
Standardization of sonar cephalometry and gestational age. Mean sac diameter measurements are not recommended for estimating the due date. The searches yielded citations. Conclusion Accurate dating of pregnancy is important to improve outcomes and is a research and public health imperative. The highest potential for bias was noted in inclusion and exclusion criteria, and in maternal demographic characteristics.
Estimation of gestational age by transvaginal sonographic measurement of greatest embryonic length in dated human embryos. Predicting delivery date by ultrasound and last menstrual period in early gestation. Accordingly, in creating recommendations and the associated summary table, single-point cutoffs were chosen based on expert review. The information should not be construed as dictating an exclusive course of treatment or procedure to be followed. Fetal Imaging Workshop Invited Participants.
This Committee Opinion outlines a standardized approach to estimate gestational age and the anticipated due date. Accurate dating of pregnancy is important to improve outcomes and is a research and public health imperative.
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