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Such methods include adding 14 days to a known duration since fertilization (as is possible in in vitro fertilization), or by obstetric ultrasonography.
The popularity of using such a definition of gestational age is that menstrual periods are essentially always noticed, while there is usually a lack of a convenient way to discern when fertilization occurred.
However early pregnancy dating is the most accurate since all babies grow at the same rate until week 13. Like the last poster said they can be up to a week off. I am still very skinny and have nearly flat abdomen. I am still very skinny and have nearly flat abdomen.
Like the last poster said they can be up to a week off.
For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the tests is larger than the 2 SD variability of the ultrasonography estimate, indicating that the gestational age estimated by ultrasonography should be used as the official gestational age.
The fertilization age (also called embryonic age and later fetal age) is the time from the fertilization.
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Be sure to talk to your health care provider about your due date.If you deliver on your due date, your baby is actually only 38 weeks old, not 40.Please remember that your due date is only an estimate.Iknow people say all the time that ultrasounds can be way off, but really ultrasounds are the most accurate way to date a pregnancy, especially in early pregnancy.
I think around 11 weeks the margin of error is like 3-5 days.
Two weeks later, I was dispointed when the "quick stick" said "Negative". About 10 days later, I still had no menstruation for that month. Two weeks later, I was dispointed when the "quick stick" said "Negative". About 10 days later, I still had no menstruation for that month. I think around 11 weeks the margin of error is like 3-5 days. Your doctor is going to give you a date based off of your LMP.