Estimating the date of confinement, or estimating date for delivery, can be determined with Naegele’s rule.

The woman is required to have a regular menstrual cycle of 28 days.

  • Add 7 days to the first day of the last menstrual period
  • Subtract 3 months
  • Add 1 year


  • Last menstrual period: May 1, 2014
  • Add 7 days: May 8, 2014
  • Subtract 3 months
  • Add 1 year – What do you get? Hover below to find out!

Answer: February 8, 2015 is the estimated date of confinement

Silvestri, Linda Anne. “Obstetrical Assessment”Saunders Comprehensive Review for the NCLEX-RN Examination. 5th ed. St. Louis, MO: Saunders Elsevier, 2011. 261. Print.

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