How accurate are ultrasounds at dating pregnancy

“If the scan date differs from your LMP dates, then the scan dates will be used, but do discuss with your midwife if you are concerned.

how accurate are ultrasounds at dating pregnancy-15

Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period, explains NHS Choices. This is especially true if you have an irregular cycle or have been on the Pill for example.

“Scans are an accurate way to give you a due date,” confirms Nigel from the Society and College of Radiographers.

” Expert Jan Steward, who is director of Ultrasound Direct and Babybond, agrees that early scans carry a much greater risk of inaccuracy.

“At our clinics we scan from 7 weeks but at this time due dates are not totally accurate as it is very early stages.

Original date given was 18 December but at the scan it was moved to 31 Dec.

It just doesn't quite add up by my reckoning of when I think I ovulated and when I know we did the deed!

It’s at this time that you will be told how many weeks pregnant you are.

Of course you have probably already used an online due date calculator.

These can be carried out from week 5 or 6 of pregnancy, which is a notoriously tricky time to be accurate on dates.

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