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Dr. Andrew Rynne
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Dr. Andrew Rynne

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How To Confirm EDD During A Pregnancy?

Sir i have a question... my wife LMP was 4th March 2010 .... we have got married on 24th March 2010 ... we did sex on 27th march for the 1st time... and she got pregnent.. now EDD calculated was 9th December by dates... and after from ultra sound EDD came was 27th December.... 9th month is started now and doctor is suggesting SGA ... we are confused what should be done now...
posted on Thu, 13 Mar 2014
Twitter Mon, 16 Nov 2015 Answered on
Twitter Tue, 17 Nov 2015 Last reviewed on
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OBGYN,  's  Response
Hallow Dear,

Since it is cumbersome and not cost effective to locate the exact date of conception, usually the expected due date of delivery (EDD) is calculated by date of last menstrual period as reference point if the periods are regular.

The formula for calculating EDD is :
EDD = LMP + 9 months + 7 days.

So in your wife's case it come to 31st December. Ultrasound also has calculated 27th December which is very close to the calculation by dates. Calculation by ultrasound has allowance of a week or so.

I hope this satisfies you.

Dr. Nishikant Shrotri
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How To Confirm EDD During A Pregnancy?

Hallow Dear, Since it is cumbersome and not cost effective to locate the exact date of conception, usually the expected due date of delivery (EDD) is calculated by date of last menstrual period as reference point if the periods are regular. The formula for calculating EDD is : EDD = LMP + 9 months + 7 days. So in your wife s case it come to 31st December. Ultrasound also has calculated 27th December which is very close to the calculation by dates. Calculation by ultrasound has allowance of a week or so. I hope this satisfies you. Dr. Nishikant Shrotri