An 18-year-old G2P1001

An 18-year-old G2P1001 with the first day of her last menstrual period of May 7 presents for her first OB visit at 10 weeks. What is this patient’s estimated date of delivery?

  1. February 10 of the next year

  2. February 14 of the next year

  3. December 10 of the same year

  4. December 14 of the same year

  5. December 21of the same year

explanation

The expected date of delivery can be estimated by using Naegele rule. To do this, count back 3 months and then add 7 days to the date of the first day of the last normal menstrual period.