Question my wife is 9 weeks pregnant with twins she has on and off bleeding and spotting for the past 3 weeks she already had 3 ultrasound scans all of which showed two fetal heartbeats we are concerned because of the spotting and bleeding which leads me to ask two 2 questions.
What are obstetric ultrasound scans obstetric ultrasound is the use of ultrasound scans in pregnancy since its introduction in the late 1950s ultrasonography has become a very useful diagnostic tool in obstetrics currently used equipments are known as realtime scanners with which a continous picture of the moving fetus can be depicted on.
ultrasound is defined by the american national standards institute as sound at frequencies greater than 20 khz in air at atmospheric pressure ultrasonic waves have wavelengths of 19 cm or less perception humans the upper frequency limit in humans approximately 20 khz is due to limitations of the middle ear auditory sensation can occur if highintensity ultrasound.
sydney ultrasound for women understands that our patients have unique needs and we tailor our care to each individual we have a range of services provided by our expert team of sonologists sonographers and genetic counsellors who use state of the art ultrasound technology.
Todays obstetrician gynecologist is required to interpret and in many cases perform ultrasound scans in the first trimester in fact certification of residency programs in many countries requires documentation of adequate exposure to and training in the evaluation of firsttrimester ultrasound.
The gestational sac is the first identifiable structure routinely imaged in the first trimester it is identified by transabdominal ultrasound as early as 5 weeks gestation and may be seen as early as 4 weeks gestation by transvaginal ultrasound 15 16 47 the gestational sac is an echofree space containing the fluid embryo and.
ultrasound exposures that elevate fetal temperature by 4176c above normal for 5 min or more have the potential to induce severe developmental defects.
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The earlier age at delivery of multiple gestations is a reflection of the increased incidence of preterm labor and obstetric intervention for complications such as preeclampsia abruptio placentae fetal growth restriction and increased risk for stillbirth that occurs as the number of fetuses increases 3033.