Summary of Key Points In the first trimester, gestational age should be assigned to the pregnancy based on sonographic findings or mean sac diameter prior to the visualization of the embryo and by embryonic or fetal crown-rump length (CRL) thereafter.…
Summary of Key Points The progression of transvaginal sonographic findings in normal early first trimester pregnancies follows a highly predictable pattern, with a gestational age variability of approximately ±0.5 week: gestational sac at 5.0 weeks, yolk sac at 5.5 weeks,…
Summary of Key Points Accurate assignment of gestational age to a pregnancy is important for several reasons, including timing of screening tests for aneuploidy, monitoring fetal growth and diagnosing growth disturbances, and scheduling of delivery by elective induction or cesarean.…