Question: Which dating scan is more accurate?

The earlier the ultrasound is done, the more accurate it is at estimating the babys due date. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy. The most accurate time is between 8 and 11 weeks gestation.

How accurate is a 20 week ultrasound for due date?

3 Early ultrasound due dates have a margin of error of roughly 1.2 weeks. After 20 weeks of pregnancy, your estimated due date shouldnt change based on an ultrasound because it will be less accurate. And remember: Its an estimated due date; the vast majority of women dont deliver their babies the day theyre due.

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