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First Trimester Pregnancy Ultrasound
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Standardization of sonar cephalometry and 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. The yolk sac lies within the gestation sac and looks like a little round circle inside the pregnancy sac. You will need to get a referral from your doctor or midwife for a dating scan. New crown—rump length curve based on over pregnancies. Hence, do not go to the toilet once you have commenced drinking the water. Last reviewed: Cochrane Database of Systematic Reviews , Issue 7. The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date. For a vaginal scan, you can have an empty bladder. Its use in early pregnancy is therefore cautioned. All rights reserved. Transvaginal ultrasound is an internal ultrasound. This is to accurately measure and assess the pregnancy. Appropriately performed obstetric ultrasonography has been shown to accurately determine fetal gestational age 1. Doppler facilities are generally an integral part of modern ultrasound scanners.
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