Pettker, MD; James D. 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. It is hard not to, but seriously just give yourself a time period you want to be ready and know that date they give is not likely anyway.
I was a mess!!! A consistent and exacting approach to accurate dating is also a research and public health imperative because of the influence of dating on investigational protocols and vital statistics. An accurately assigned EDD early in prenatal care is among the most important results of evaluation and history taking. Use our pregnancy calculator. Eggs have a window as big as 12 days to be fertilized. No it wouldn't change with each us.. Pettker, MD; James D.