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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Why Is My Due Date As Per LMP And USG Different?

Gud mrng Mam, i am 27 years old and im pregnant........my problem is- i am confused because according to my lmp (6 feb 2014) my due date is 13 november 2014 but acc to my usg scan every time its 1 dec 2014...... my periods are regular except jan 2014 bcoz i have only 20 days cycle in this month so plz help me what is right due date for me...........my foetus weight is 1.265 gm
Mon, 3 Nov 2014
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General & Family Physician,  's  Response
As +/- 1 week difference of due date between ultrasound and lmp is normal or considerable.
More than 1 week difference should be ruled out for any abnormality.
As you have due date according to lmp is early then might conception has taken place earlier in your menstrual cycle.
So difference of 14/15 days is not the matter to worry if in ultrasound all parameters are normal.
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Why Is My Due Date As Per LMP And USG Different?

As +/- 1 week difference of due date between ultrasound and lmp is normal or considerable. More than 1 week difference should be ruled out for any abnormality. As you have due date according to lmp is early then might conception has taken place earlier in your menstrual cycle. So difference of 14/15 days is not the matter to worry if in ultrasound all parameters are normal.