In the first trimester, gestational sac mean diameter and crown-rump length measurements have become the primary means of evaluating gestational age. Accurate determination of gestational age can positively affect pregnancy outcomes. Two of these methods, growth-adjusted sonographic age 79 and averaging multiple parameters 8081 are discussed. This document reflects emerging clinical and scientific advances as of the date issued and is subject to change. The yolk sac will be visible before a clearly definable embryonic pole.
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However, there is great usefulness in having a single, uniform standard within and between institutions that have access to high-quality ultrasonography as most, if not all, U.
A new parameter for prenatal diagnosis and dating. Grumbach and co-workers 86 have suggested that the femur continues to grow normally throughout pregnancy in twin gestations, while the head BPD and HC and abdominal AC growth rates decrease in the last 10 weeks of pregnancy.