A woman arrives at the clinic for a pregnancy test. The first day of her last menstrual pe-riod (LMP) was February 14, 2010 . Her expected date of birth (EDB) would be:
a. September 17, 2010.
b. November 7, 2010.
c. November 21, 2010.
d. December 17, 2010.
C
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A Using Nägele's rule, the EDB is calculated by subtracting 3 months from the first day of the LMP and adding 7 days + 1 year to the day of the LMP. There-fore, with an LMP of February 14, 2010:
February 14, 2010 – 3 months = November 14, 2009 + 7 days = November 21, 2009 + 1 year = November 21, 2010
B Using Nägele's rule, the EDB is calculated by subtracting 3 months from the first day of the LMP and adding 7 days + 1 year to the day of the LMP. There-fore, with an LMP of February 14, 2010:
February 14, 2010 – 3 months = November 14, 2009 + 7 days = November 21, 2009 + 1 year = November 21, 2010
C Using Nägele's rule, this is the correct expected date of birth.
D Using Nägele's rule, the EDB is calculated by subtracting 3 months from the first day of the LMP and adding 7 days + 1 year to the day of the LMP. There-fore, with an LMP of February 14, 2010:
February 14, 2010 – 3 months = November 14, 2009 + 7 days = November 21, 2009 + 1 year = November 21, 2010
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