Which question would best help a nurse determine a pregnant client's estimated date of delivery?

To determine a pregnant client's estimated date of delivery, knowing whether the menstrual periods are regular is crucial. Regular menstrual cycles provide a more consistent framework for estimating gestational age. If the client has regular cycles, calculating the estimated due date (EDD) typically involves using the first day of the last menstrual period (LMP) as a starting point. This method, known as Naegele’s Rule, assumes a typical cycle length of about 28 days.

Conversely, if menstrual cycles are irregular, relying solely on LMP may lead to inaccuracies in estimating the due date. In such cases, further assessments or ultrasounds may be necessary to provide a more accurate estimate.

Questions about home pregnancy tests, the age at which menses began, or previous contraceptive methods do not directly assist in determining the due date. They may provide information about the pregnancy's history or the client's reproductive health but do not offer clarity on the EDD calculations.