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The most accurate time is between 8 and 11 weeks gestation.
Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy.If you become concerned about any aspect of your scan, the images and recordings you have taken home or you wish to make a complaint, you can contact the clinic where you had your scan and our staff will discuss any concerns that you may have.Most dating scans are done with a trans-abdominal transducer and a fullish bladder.Usually the expected date of delivery (EDD or EDC) is calculated from your last menstrual period - if the early dating scan calculates the EDD to be within 5 days of the EDD from your last menstrual period.
The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.
As the baby gets bigger, it starts to express its individual growth potential.