Using Nagle's rule, what is the estimated date of confinement (EDC) for a client whose last menstrual period started on December 1?

Nagle's rule is a method used to estimate a woman's due date based on the first day of her last menstrual period (LMP). The general formula involves taking the date of the LMP, adding one year, subtracting three months, and adjusting the day as necessary.

In this case, the last menstrual period started on December 1. Here's how to apply Nagle's rule to calculate the estimated date of confinement (EDC):

1. Start with the LMP: December 1.

2. Add one year: December 1 of the following year.

3. Subtract three months: This brings us to September 1.

4. The date remains the same as we did not encounter a day adjustment that’s necessary.

This calculation results in an estimated date of confinement of September 1. However, since pregnancy typically lasts about 40 weeks, adjustments with days may lead to estimating a final EDC that aligns with expected due date variations based on cycles, which often leads to September 8 when considering additional weeks.

Therefore, the estimated date of confinement derived from applying Nagle’s rule on the last menstrual period of December 1 results in September 8 being the most accurate choice among the options provided.