What is typically evaluated during obstetric Ultrasound in the first trimester

What is typically evaluated during obstetric Ultrasound in the first trimester?

  • • Presence or absence, and location of a gestational sac.
  • • Presence or absence of a yolk sac and of an embryo within a gestational sac.
  • • Dating of a gestation based on the mean gestational sac diameter and, when possible, preferably on the embryonic crown-rump length (CRL).
  • • Embryonic cardiac activity recorded by two-dimenstional video clip or M-mode imaging.
  • • Number of gestations.
  • • Other uterine and adnexal masses.
  • • Presence or absence of pelvic fluid.
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