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Can the calculation done from an ultrasound report and the one made from your last menstrual period differ as much as 1 week?In: Ultrasounds |
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Taking care of yourself with baby on the way.
Answer
Yes, if you have a long cycle they can differ.
In my first pregnancy my last period was December 17th which made my due date 23rd September. My ultrasound (at 18 weeks) gave a date of October 4th. I had a 36 day cycle.
3 years later my cycle was 28 days and my ultrasound was spot on.
An early ultrasound, around 6-7 weeks is extremely accurate. The later in pregnancy it is done the greater the variation as babies are all different sizes.
First answer by Englishangel. Last edit by Englishangel. Contributor trust: 1554 [recommend contributor]. Question popularity: 55 [recommend question]
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