What is the estimated delivery date (EDC) for a 29-year-old female with a last menstrual period (LMP) on April 4, using Nägele's rule?

To calculate the estimated delivery date (EDD) using Nägele's rule, you start with the last menstrual period (LMP) date and follow a specific formula. The rule states that you can estimate the due date by adding one year, subtracting three months, and adding seven days to the first day of the last menstrual period.

In this case, the LMP is April 4. Here are the steps to find the EDD:

1. Start with the LMP: April 4.

2. Add one year: This makes it April 4 of the following year, which is April 4, the next year.

3. Subtract three months: Going back three months from April takes you to January 4.

4. Add seven days: Adding seven days to January 4 gives you January 11.

Therefore, following these steps leads to an estimated delivery date of January 11. This method is commonly used in obstetrics to anticipate the delivery date based on a regular menstrual cycle. This calculation is based on the average length of a human pregnancy, which is typically 40 weeks from the first day of the last menstrual period.