Instead, you will be offered another blood test between 14 and 20 weeks of pregnancy to screen for the risk of Down's syndrome. When you can get pregnant Signs and symptoms When you can take a test Finding out Problems Help if you're not getting pregnant Fertility tests Fertility treatments Work out your due date When pregnancy goes wrong Sign up for weekly pregnancy emails. Ask a midwife: Dating scans are used to confirm how many weeks pregnant you are and your expected due date. It's used to see how far along in your pregnancy you are and check your baby's development. The most accurate time is between 8 and 11 weeks gestation.
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This is why an early pregnancy dating scan, rather than one done in the later stages of pregnancy, is considered more accurate when assessing the expected date of delivery. The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test". Access information to help you navigate the aged care system Visit My Aged Care. A dating scan can detect a few things:. When you are first referred for a seven week ultrasound, the first of many types of ultrasoundask your GP or maternity care provider who has the best reputation for quality scan results. It is also impossible to do a thorough foetal screening assessment because it is still just too premature in terms of embryonic development.