How accurate are dating scans in pregnancy

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Later in the second trimester, you can be at least 2 weeks off.If you were to present for your first sono in the third trimester there can be 3 or more weeks of uncertainty of dates. Read more It's always a good idea to get it confirmed by your doctor but they are pretty similar to the ones we use in our office.I know I ovulate late, so I am going with the dating scan dates.These are also the dates my Ob and m/w have chosen to go by.

The most reliable thing is to now exactly when you ovulated, not an u/s.From what I have been told, early u/s is the best way to pinpoint the gestation of the baby.I had my first scan this pg at what I thought was 7wk 5d the scan backdated me to 7wk 1d- I knew this couldn't be right as I would have got my BFP on 4dpo.First trimester ultrasounds are more accurate than second trimester ultrasounds, which are in turn more accurate than third trimester ultrasounds.First trimester ultrasounds can reliably predict gestational age within 5-7 days.

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