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Ultrasound examinations from 12 to 22 weeks are regarded as being within 10 days of accuracy or up to 10 days earlier or 10 days later than the woman's calculated due date.
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In some situations, such as when the scan is completed before 10 weeks of gestation or you are overweight, you may also need a vaginal scan.
Description: This test is not quite as accurate as the combined test. Ultrasound scansusehigh-frequency soundwaves to create moving images of the baby, shown on a screen.