Final answer:
Naegle's rule is a formula used in obstetrics to estimate the expected due date for a pregnant woman.
Step-by-step explanation:
Naegle's rule is a formula used in obstetrics to estimate the expected due date for a pregnant woman. This rule states that the estimated due date is calculated by adding 7 days to the first day of the woman's last menstrual period (LMP), and then subtracting 3 months. For example, if a woman's last period started on January 1st, her estimated due date would be October 8th (January 1st + 7 days - 3 months = October 8th).
It is important to note that Naegle's rule is an approximation and may not be accurate for every woman. It is often used as a starting point for estimating due dates, but further medical examinations, such as ultrasound, are necessary to confirm the actual gestational age of the fetus.