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Dating ultrasound measurements

Transvaginal ultrasound is performed using a special transducer which is slightly thicker than a tampon. It is covered with a disposable latex sheath and lubricating gel, then gently placed into the vagina. The probe sits in the vagina throughout the examination which usually takes between minutes. Most patients find the examination much more tolerable when compared to a cervical PAP smear. During the scan the sonographer may need to gently press on the abdomen to move bowel out of the way and bring the ovaries and other pelvic structures into view. This also enables any point of tenderness in the pelvis to be identified.
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Fetal growth assessment - decision support

American Institute of Ultrasound in Medicine consensus report on potential bioeffects of diagnostic ultrasound. National Council on Radiation Protection and Measurements. Criteria Based on All Known Mechanisms. National Council on Radiation Protection and Measurements; Effective prenatal diagnosis relies on a high standard of imaging. Several national and international bodies have described standards for imaging in the first, second, and third trimester of pregnancy. However, many experts in the field advocate the use of additional views to improve diagnostic performance.
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Fetal growth and Well-Being Assessment

Accuracy of the EFW is reported to be best when examinations are performed within 7 days before delivery [38]. ACOG advises "An accurate diagnosis of macrosomia can be made only by weighing the newborn after delivery. J Matern Fetal Neonatal Med.
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History Galton whistle, one of the first devices to produce ultrasound Acoustics , the science of sound , starts as far back as Pythagoras in the 6th century BC, who wrote on the mathematical properties of stringed instruments. Echolocation in bats was discovered by Lazzaro Spallanzani in , when he demonstrated that bats hunted and navigated by inaudible sound, not vision. Francis Galton in invented the Galton whistle , an adjustable whistle that produced ultrasound, which he used to measure the hearing range of humans and other animals, demonstrating that many animals could hear sounds above the hearing range of humans.
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