Final answer:
Nägele's rule involves adding 280 days to the first day of the last menstrual period (LMP) to estimate the date of delivery during pregnancy.
Step-by-step explanation:
Nägele's rule is a method used to estimate the date of delivery during pregnancy. According to Nägele's rule, the nurse adds 280 days to the first day of the last menstrual period (LMP) to estimate the due date. This rule assumes that conception occurred on day 14 of the menstrual cycle, which is usually a good approximation. It is a simple and commonly used method to estimate the expected date of delivery.