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.
