User:Acd0515/Pregnancy test
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Ultrasound
[edit]
Obstetric ultrasonography may also be used to detect and diagnose pregnancy. It is very common to have a positive at-home urine pregnancy test before an ultrasound. Both abdominal and vaginal ultrasound may be used, but vaginal ultrasound allows for earlier visualization of the pregnancy. With obstetric ultrasonography the gestational sac (intrauterine fluid collection) can be visualized at 4.5 to 5 weeks gestation, the yolk sac at 5 to 6 weeks gestation, and fetal pole at 5.5 to 6 weeks gestation. Ultrasound is used to diagnose multiple gestation, which cannot be diagnosed based on the presence of hCG in urine or blood[1]. Determination of the gestational age of the embryo/fetus is an additional benefit of ultrasound compared to hCG tests[2].
References
[edit]- ^ Wang, Peter S.; Rodgers, Shuchi K.; Horrow, Mindy M. (2019-05). "Ultrasound of the First Trimester". Radiologic Clinics of North America. 57 (3): 617–633. doi:10.1016/j.rcl.2019.01.006.
{{cite journal}}: Check date values in:|date=(help) - ^ American College of Obstetrics and Gynecology (December 2016). "Ultrasound in Pregnancy". www.acog.org. Retrieved 2024-09-08.
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