Obstetric ultrasound dating

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The objectives of this study were, first, to develop charts for ultrasound dating of pregnancy based on crown-rump length and biparietal diameter and, second, to derive reference curves for normal fetal growth based on biparietal diameter, head circumference, transverse cerebellar diameter, abdominal circumference and femur length from 10 weeks of gestational age onwards. All women had repeated ultrasound assessments to examine fetal growth. Internal validation with the actual date of delivery showed that ultrasound imaging provided reliable gestational age estimates. The earlier the ultrasound assessment the more accurate the prediction of date of delivery. After 24 weeks of gestation a reliable last menstrual period provided better estimates of gestational age.
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Obstetric Ultrasound

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Pregnancy Due Date Calculator, Obstetric Calculator | Patient

Obstetric ultrasounds are performed in the 1 st trimester for a variety of reasons, including confirmation of the pregnancy and the number of babies, assessment of bleeding, determining the gestational age and well being. You will be required to drink ml of water one hour prior to your examination. This allows the bladder to fill and helps to visualize the uterus, baby and other structures of the pelvis. Hence, do not go to the toilet once you have commenced drinking the water. If you feel as though you may struggle to hold onto the water, you can come to Sound Radiology prior to your scan to drink the water here.
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Women's Health Care Physicians

Back to Your pregnancy and baby guide. All pregnant women in England are offered an ultrasound scan at around 8 to 14 weeks of pregnancy. This is called the dating scan.
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Author information: 1 Klinika za ginekologiju i akuserstvo, Medicinski fakultet, Novi Sad. During two routine obstetric ultrasound scans, between 11 and 14 gestational weeks and around 20 weeks, the fetus should be carefully examined after which the existence of anomalies can be confirmed or, with a limited certainty that ultrasound enables, excluded. In order to obtain high standards of ultrasound screening, a uniformed protocol is needed, which would enable standardized examination.
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