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How do dating ultrasounds work

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Every pregnant woman wants to know her due date. But a due date calculated from last menstrual period with a due date calculator often doesn't match the due date that is estimated by ultrasound also known as a sonogram. During an ultrasound, a technician spreads a warm gel over the lower part of the abdomen, and then presses a tool called a transducer against the belly to examine the fetus using sound waves. An image of the fetus appears on an accompanying computer screen.
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How many ultrasounds during pregnancy are normal and what they're for

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Dating Ultrasound - Ultrasound Accuracy for Predicting Due Dates

Back to Health A to Z. An ultrasound scan, sometimes called a sonogram, is a procedure that uses high-frequency sound waves to create an image of part of the inside of the body. You can't hear these sound waves, but when they bounce off different parts of the body, they create "echoes" that are picked up by the probe and turned into a moving image. Before having some types of ultrasound scan, you may be asked to follow certain instructions to help improve the quality of the images produced. Depending on the area of your body being examined, the hospital may ask you to remove some clothing and wear a hospital gown. In some cases, you may also be given an injection of a harmless substance called a contrast agent before the scan, as this can make the images clearer. Most ultrasound scans last between 15 and 45 minutes.
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Ultrasound scan

How Ultrasound Works. Freudenrich , Ph. There are many situations in which ultrasound is performed. Perhaps you are pregnant, and your obstetrician wants you to have an ultrasound to check on the developing baby or determine the due date.
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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. Performing an ultrasound at this early stage of pregnancy can more accurately confirm the timing of the pregnancy, and can also assess for multiple fetuses and major congenital abnormalities at an earlier stage. There is no difference, however, in perinatal death or poor outcomes for infants.
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