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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.
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Shows you a personal breakdown of the months and % of pregnancy completed.
Trimester Calculator - The three basic methods of calculating trimesters are explained.
The initiation of pregnancy for the calculation of gestational age can be different from definitions of initiation of pregnancy in context of the abortion debate or beginning of human personhood.
As a general rule, the official gestational age should be based on the actual beginning of the last menstrual period, unless any of the above methods gives an estimated date that differs more than the variability for the method, in which case the difference cannot probably be explained by that variability alone.
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.