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Dating ultrasound at weeks

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The results of ultrasound testing provide you and your health care provider with critical information about you and your baby. See below for descriptions of the information gathered from these two types of ultrasounds. Ultrasound uses high-frequency sound waves to create images of the inside of the body. The technique does not use any radiation. It is safe, painless and relatively quick test that usually takes around 30 minutes.
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12-week scan

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How many ultrasounds do you get in a typical pregnancy?

Objectives: To determine the accuracy of established ultrasound dating formulae when used at weeks of gestation. Methods: One-hundred and sixty-seven singleton pregnancies conceived after in-vitro fertilization IVF underwent a dating scan at weeks of gestation. Gestational age at the dating scan was calculated by adding 14 days to the number of days between the date of oocyte retrieval and the date of the ultrasound scan. Gestational age according to oocyte retrieval was regarded as the true gestational age. True gestational age was compared to gestational age calculated on the basis of 21 dating formulae based on fetal crown-rump length CRL measurements and to three dating formulae based on fetal biparietal diameter BPD measurements. In a previous study the three BPD formulae tested here had been shown to be superior to four other BPD formulae when used at weeks of gestation.
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Ultrasound Accuracy for Predicting Due Dates

Find out what you can see at your dating ultrasound as early as six weeks along and how to prepare for that first appointment. By Kate Daley October 28, We asked the experts all you need to know about that six-week ultrasound or first ultrasound appointment.
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Obstetric ultrasonography , or prenatal ultrasound , is the use of medical ultrasonography in pregnancy , in which sound waves are used to create real-time visual images of the developing embryo or fetus in the uterus womb. The procedure is a standard part of prenatal care in many countries, as it can provide a variety of information about the health of the mother, the timing and progress of the pregnancy, and the health and development of the embryo or fetus. The International Society of Ultrasound in Obstetrics and Gynecology ISUOG recommends that pregnant women have routine obstetric ultrasounds between 18 weeks' and 22 weeks' gestational age the anatomy scan in order to confirm pregnancy dating, to measure the fetus so that growth abnormalities can be recognized quickly later in pregnancy, and to assess for congenital malformations and multiple pregnancies twins, etc.
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