# First trimester ultrasound dating

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A new standard in the United States was reached at a multispecialty conference sponsored by the Society of Radiologists in Ultrasound. The most accurate measurement for dating is the of the fetus, which can be done between 7 and 13 weeks of gestation.\
&#x20;![first trimester ultrasound dating](http://www.advancedwomensimaging.com.au/files/imagecache/page-image-enlarged/img/page/FirstTrimesterYolkSac.jpg)\\

Note that choroid plexuses extend from the medial to the lateral border of the posterior horn. The accuracy is relatively imprecise when attempted early. Placenta previa should not be reported at this stage. In appropriate circumstances, additional aneuploidy markers, including nasal bone, tricuspid regurgitation, ductal regurgitation and others, may be sought by personnel with appropriate training and certification -.\
&#x20;![first trimester ultrasound dating](https://image.slidesharecdn.com/firsttrimesterultrasound-151117074901-lva1-app6892/95/first-trimester-ultrasound-20-638.jpg?cb=1447746655)\\

**Tests During Pregnancy: Abdominal Ultrasound** - Accurate dating is vital to pregnancy management, as certain interventions and management decisions may be based on such information including timing of delivery in the case of pregnancy complications.\
&#x20;![first trimester ultrasound dating](http://www.advancedwomensimaging.com.au/files/imagecache/page-image-enlarged/img/page/9WeekEmbyro.jpg)\\
