Pregnancy dating by lmp
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The median is merely a guideline for the day at which half of all births occur earlier, and half of all births occur later.
In 1806, Naegele became ordinary professor and director of the lying-in hospital in Heidelberg.
Please remember that the result will not necessarily be the day that your baby arrives.
The actual date may be any time from 38 to 42 weeks in most pregnancies.
Except in threatened pregnancies (for example, in pre-eclampsia), "lying-in" or bedrest is no longer a part of antenatal care.
Due date estimation basically follows two steps: Distribution of gestational age at childbirth among singleton live births, given both when gestational age is estimated by first trimester ultrasound and directly by last menstrual period.
About 80% of childbirths occur between 37 and 41 weeks of gestational age, with a somewhat more narrow span when based on first trimester ultrasound.
Given that these gestation lengths are only estimates of an average, it is helpful to consider gestation time as a range of dates rather than as a single "due date".
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If problems occur you may be advised that delivering your baby earlier is the safest option.