A 28-year-old woman comes into the clinic for her first prenatal appointment. She tells the nurse the first day of her last menstrual period was October 10, 2015. The nurse uses Naegele’s Rule and calculates the client’s estimated date of confinement as

Number 4 is correct.

Naegele’s Rule is used as follows to calculate the date of confinement: Find the first day of the last menstrual period: October 10, 205 . Add 1 year: October 10, 2015 + 1 year = October 10, 2016 . Subtract 3 months: October 10, 2016 − 3 months = July 10, 2016 . Add 7 days: July 10, 2016 + 7 days = July 17, 2016 .