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These images are a random sampling from a Bing search on the term "First Trimester Ultrasound. Search Bing for all related images. Started in , this collection now contains interlinked topic pages divided into a tree of 31 specialty books and chapters. Content is updated monthly with systematic literature reviews and conferences. Although access to this website is not restricted, the information found here is intended for use by medical providers.
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Perinatology and Obstetrical Calculators

Read terms. Pettker, MD; James D. Goldberg, MD; and Yasser Y. This document reflects emerging clinical and scientific advances as of the date issued and is subject to change.
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The impact of optimal dating on the assessment of fetal growth

Objectives: To develop a sonographic dating formula based on fetal crown-rump length CRL in a Hong Kong Chinese population, quantify its systematic prediction error and compare its performance with established dating formulae. Methods: This was a prospective observational study of women with a spontaneously conceived singleton pregnancy and a regular menstrual cycle in the preceding month period. The CRL of each fetus was measured three times, the mean of which was used to derive the best-fit fractional polynomial regression model for estimation of gestational age in relation to CRL. For each fetus, the menstrual age was compared to the gestational age calculated using three established dating formulae based on CRL measurement. The mean of the differences between estimated and menstrual age was calculated for each formula.
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Metrics details. Fetal ultrasound scanning is considered vital for routine antenatal care with first trimester scans recommended for accurate estimation of gestational age GA. A reliable estimate of gestational age is key information underpinning clinical care and allows estimation of expected date of delivery. Fetal crown-rump length CRL is recommended over last menstrual period for estimating GA when measured in early pregnancy i.
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