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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Is EDD Calculated Based On LMP?

I am confused on how doctors get the due dates. Something happened once on November 17th, 2009 and I was told that it takes a couple of days to concieve. My LMP was November 7thth, 2009 and I was told my due date should be August 14, 2010. I am confused because I thought that I should be pregnan for 9 monthsand that would be August 17th, 2010. Can you please help me? Is this correct?


posted on Thu, 13 Mar 2014
Twitter Sun, 5 Oct 2014 Answered on
Twitter Mon, 6 Oct 2014 Last reviewed on
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General & Family Physician,  's  Response
Hi,
I understand your problem.
Calculation of expected date of pregnancy is done for estimation of approximate date of delivery. It helps by making would be parents to be alert & ready for the important event in their life.
It is calculated by addition of 9 months & 7 days to the first day of last menstrual cycle.
Still there are variations in menstrual cycles, ovulation days & actual fertilization in each conception. so there can be an error of + or - & days in given EDD.
Thanks.
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How Is EDD Calculated Based On LMP?

Hi, I understand your problem. Calculation of expected date of pregnancy is done for estimation of approximate date of delivery. It helps by making would be parents to be alert & ready for the important event in their life. It is calculated by addition of 9 months & 7 days to the first day of last menstrual cycle. Still there are variations in menstrual cycles, ovulation days & actual fertilization in each conception. so there can be an error of + or - & days in given EDD. Thanks.