![]() This is especially important if you are going to have any screening tests for Down's syndrome, as knowing the exact dates makes sure your result is accurate. It is now recommended that all pregnant women have a dating scan in the first trimester - ideally at 10 to 13 weeks of pregnancy - to confirm your dates. Once at 16 - 18 weeks to assess fetal abnormalities, and again at 32 - 34 weeks to assess age and well-being. In some countries, sonograms are performed just twice during pregnancy. There is no hard and fast rule for the number of scans you should have during pregnancy. The total number of scans will vary depending on whether a previous scan has detected certain abnormalities that require follow-up assessment. As a practical matter, ultrasound scanning has proven to be so popular with patients and also their obstetricians, that almost everyone receiving regular prenatal care ends up with at least one scan anyway.
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