12 week dating scan accuracy

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In some respects the seven week ultrasound can be quite accurate because the embryo is developing very quickly.

With maturity, the size of the baby correlates less to its age than in the early weeks.At around seven weeks of pregnancy, it’s reasonably common for women to have their first ultrasound.This can be for many reasons but the most common is to confirm pregnancy and to check that the embryo is viable and “everything’s ok”.This is the period of time which provides the most accurate assessment.Generally, ultrasounds which are performed in the first trimester are within 3-5 days of being accurate in terms of assessing gestational age.

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