Estimating the date of delivery is calculated using Nägele's rule.

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Nägele's rule is a commonly used method for estimating the date of delivery in pregnancy. It is based on the assumption that the average pregnancy lasts for 280 days from the first day of the woman's last menstrual period. Nägele's rule adds 7 days to the first day of the last menstrual period, subtracts 3 months from the month, and adds 1 year to the year to estimate the due date. However, it is important to note that this method may not be accurate for all women, particularly those with irregular menstrual cycles or who have conceived through assisted reproductive technologies.

Estimating the Date of Delivery Is Calculated Using Nägele's Rule